My new JBL 4345 build.

[fencki]

hi.
i wanted to share my outcome of my 4345 project with you.

still waiting for the 2122h to arrive (hopefully tomorrow)

used drivers:
2405 (original blue dia + alnico)
2425j (original dia)
2307 + 2308
2122h (until now test with 2123h)
2245h (original cones)

i used the giskard schematic with biamp only and coupled caps.
external crossover in external box.

here are the photos:
76325
76326
76327

greetings from vienna
slavko

[lordoflight]

Are you happy with the sound? What crossover are you using for the bass amp?

[fencki]

Are you happy with the sound? What crossover are you using for the bass amp?

for now i am happy.
have to wait for the original midbass chassis to come. i will have to do measurements once all the original drivers are built in.
but i am impressed with the moment outcome too. knowing it will be better with the 2122h...

i am using a active crossover for the LF drivers with the JBL 6260 for now (crossing at 290 Hz). no passive crossover used.
for the moment i am using an mini dsp DDRC24. but i will go back with an analog active crossover in the future.
my budget for now is low due to the high costs of this project...

[lordoflight]

I know the feeling. I have started my own project last year and still not done with it.

http://www.audioheritage.org/vbulletin/showthread.php?37868-JBL-4346-DYI-with-2123H&highlight=

My filters are now in Australia with Mr. Ian MacKenzie for a full revamp to 4344MKII. I was not happy with the sound. To me it sounded veiled and was lacking bass. Maybe bi-amping will do the trick. What can I say... this is one hell of a hobby....

[fencki]

hi.
i already have it biamped. LF has no passive crossover.
i like the sound so far.
this hobby is real fun. sometimes it can be frustrating but when you get it right in the end, you smile like a child on christmas eve..
:)

[fencki]

the only thing that makes me thinking is, that the L-pads are only to the half way "sensitive". after the half the behaviour stays the same.
means, that from the half there is no difference in volume any more until full turn...

can somebody help me with that?
is that normal behaviour?

thx

[lordoflight]

It is difficult to tune in the l-pads by ear. When I was tuning the l-pads I was using a dB meter. Nevertheless when the l-pad is full off the speaker should be almost silent. Is this the case?

[fencki]

hi.
yes, if i turn total to the left, the speakers are silent.

[srm51555]

Nice Work!

[lordoflight]

hi.
yes, if i turn total to the left, the speakers are silent.

You should buy yourself a Dayton mic https://www.amazon.com/Dayton-Audio-iMM-6-Calibrated-Measurement/dp/B00ADR2B84 attachit to your iphone, geta db meter app and you're in business. Fix the mic in front of the driver you want to set and get the measurements going.

Refer to this thread :http://www.audioheritage.org/vbulletin/showthread.php?37868-JBL-4346-DYI-with-2123H&p=391167&viewfull=1#post391167

I hope this helps.

[fencki]

i have a umik-1 microphone with my minidsp.
i will do the test once the 2122h is mounted. they arrived today. i am happy now!

will update you soon.

thx

[lordoflight]

i have a umik-1 microphone with my minidsp.
i will do the test once the 2122h is mounted. they arrived today. i am happy now!

will update you soon.

thx


Where did you find the 2122? I ended up using 2123 instead?

[BMWCCA]

Mine use 2123 baskets with 2122 cones from JBL. Don't know if any 2122 cone kits still exist though.

GT's note in the Designer's Post in the System Information archive says:
I noticed a comment earlier in this string regarding the 2122H. It is a really good voice transducer. It always has been and always will be. Things just sound really natural through it. Another one that might be slightly better is the 2123. It is a little less smooth but perhaps a little more realistic on voice. Either are really good for that critical range from a few hundred Hz to about 1500 Hz.

[fencki]

Where did you find the 2122? I ended up using 2123 instead?

i know one who knows one who had them. was just lucky...

[fencki]

Mine use 2123 baskets with 2122 cones from JBL. Don't know if any 2122 cone kits still exist though.

GT's note in the Designer's Post in the System Information archive says:


i have two original c8r2122 recone in spare.
was lucky to get them. wanted to recone e-110 but then i got the 2122h.

[fencki]

update with 2122h

76363

[lordoflight]

i have two original c8r2122 recone in spare.
was lucky to get them. wanted to recone e-110 but then i got the 2122h.

Do you consider selling them? I have two 2123 baskets.

[fencki]

Do you consider selling them? I have two 2123 baskets.

sorry, but i will not sell them.

[fencki]

first measurement complete...

76366
76367

[berga12]

What kind of system are you using?


Nice Job, really expensive CX :) , and very nice dark finishing, I Like that!

[fencki]

What kind of system are you using?


Nice Job, really expensive CX :) , and very nice dark finishing, I Like that!


hi.
thx for the compliment.
yes the x-over was a bit pricey.

i am using 2405, 2425j, 2122h, 2245h, 2307 and 2308.
in the moment i am using minidsp as active xover (290 Hz) and for amplification one yamaha m-2 and JBL 6260.

regards

[berga12]

the request was on the measuring system :)

sorry for the missunderstanding.

[Odd]

REW is free room acoustics analysis software for measuring and analysing room and loudspeaker responses. (https://www.roomeqwizard.com/)

[berga12]

thanks Odd

[audiomagnate]

REW is free room acoustics analysis software for measuring and analysing room and loudspeaker responses. (https://www.roomeqwizard.com/)

I use it all the time. You'll need a measurement mic, a mic preamp/phantom power source and a long cable as well.

[fencki]

i use the umik-1 with usb on mac!
does a good job.
rew is a good program for measurements.

dirac with ddrc24 does a very good room-correction!

[fencki]

here is an short update of the status of my gear:

7645876459764607646176462

[Mr. Widget]

Too bad you're not into vinyl, I bet your system would sound pretty good playing analog source material. :D

Very cool setup.


Widget

[quindecima]

:rotfl::rotfl::rotfl:

[fencki]

Too bad you're not into vinyl, I bet your system would sound pretty good playing analog source material. :D

Very cool setup.


Widget

i hate vinyl.
do not like the sound nor the feeling about all the analogue stuff!!
:D

[Ricpan]

Very nice. I have an orignal set of 4345s that I'm going to build a set of 3145 charged crossovers for. I have most of the parts ordered. I hope mine look as good as yours. I love vinyl.

[fencki]

Very nice. I have an orignal set of 4345s that I'm going to build a set of 3145 charged crossovers for. I have most of the parts ordered. I hope mine look as good as yours. I love vinyl.

i was joking. i am only playing vinyl.
i hope you ll let us know about your progress with the charged cc's.

[fencki]

here is an update of my babies and my gear...

769397694076942

[XRT22]

hi.
i wanted to share my outcome of my 4345 project with you.

still waiting for the 2122h to arrive (hopefully tomorrow)

used drivers:
2405 (original blue dia + alnico)
2425j (original dia)
2307 + 2308
2122h (until now test with 2123h)
2245h (original cones)

i used the giskard schematic with biamp only and coupled caps.
external crossover in external box.

here are the photos:
76325
76326
76327

greetings from vienna
slavko

Your 4345's look fantastic Slavko! Superb job! I'm starting my own build soon. What did you find to be the most difficult part of the project? Are there any recommendations you could make to a prospective 4345 DIY'er? Mario.

[fencki]

hi.
it is a very FUN project.
do you have all your drivers?
if not the main problem will be to find the right crossover for the drivers.
if all the drivers are original, you can find schematics here on the forum...

the main problem for me was to find the 2122h. this was a real nightmare and a big search.
the horns and lenses are also not easy to find, but much easier than the middriver.
(this problems are here in vienna/europe)

the best tip i can give is take your time and don´t rush. all the enclosure plans are here on the forum and you can follow them easily.

i didn´t take my time for the finish of the speakers. so i will have to sand them again and lacquer them again.

i made the crossovers outside the cabinet. it was easier for me to do it this way...

feel free to ask me anything you want if needed.

regards from vienna

[XRT22]

hi.
it is a very FUN project.
do you have all your drivers?
if not the main problem will be to find the right crossover for the drivers.
if all the drivers are original, you can find schematics here on the forum...

the main problem for me was to find the 2122h. this was a real nightmare and a big search.
the horns and lenses are also not easy to find, but much easier than the middriver.
(this problems are here in vienna/europe)

the best tip i can give is take your time and don´t rush. all the enclosure plans are here on the forum and you can follow them easily.

i didn´t take my time for the finish of the speakers. so i will have to sand them again and lacquer them again.

i made the crossovers outside the cabinet. it was easier for me to do it this way...

feel free to ask me anything you want if needed.

regards from vienna

Thanks very much Slavko.

So far, I have the 2245h drivers and 2122h (actually 2123 re-coned with 2122 cones).

I plan to also get originals for all the rest of the components, i.e. 2405's, 2307's and 2421B's (or 2425J's).

Will I need to modify the crossover schematic because I'm using 2123 reconed to 2122?

Mario

[Mr. Widget]

Will I need to modify the crossover schematic because I'm using 2123 reconed to 2122?
A JBL 2122 cone kit in a 2123 is a 2122H in every way except for the label on the back.

In collecting these components realize that a good DC reading does not guaranty that the driver is actually up to spec, and most HF drivers will need to be re-diaphragmned by an experienced professional if you are to have ideal performance.


Widget

[fencki]

A JBL 2122 cone kit in a 2123 is a 2122H in every way except for the label on the back.

In collecting these components realize that a good DC reading does not guaranty that the driver is actually up to spec, and most HF drivers will need to be re-diaphragmned by an experienced professional if you are to have ideal performance.


Widget

i agree in all points with mister widget.
he is one of the pros here i trust whatever he says.

regards

[XRT22]

A JBL 2122 cone kit in a 2123 is a 2122H in every way except for the label on the back.

In collecting these components realize that a good DC reading does not guaranty that the driver is actually up to spec, and most HF drivers will need to be re-diaphragmned by an experienced professional if you are to have ideal performance.


Widget
Thanks Mr. Widget!

Can you please tell me the difference between the 2421B and 2425J? I have found references to both in listings of 4345 components. Are these interchangeable without the need for crossover changes?

[XRT22]

Thanks Mr. Widget!

Can you please tell me the difference between the 2421B and 2425J? I have found references to both in listings of 4345 components. Are these interchangeable without the need for crossover changes?

Also, what effect would there be if I was to use a 2420 instead of either a 2421B or 2425J? Would I need to modify the Crossover to accommodate this change? Thanks in advance!

[Mr. Widget]

Can you please tell me the difference between the 2421B and 2425J? I have found references to both in listings of 4345 components. Are these interchangeable without the need for crossover changes?The 2421B has an aluminum diaphragm which many feel sounds better, but this is not universal. The 2425J was created to mimic the 2421B with a ferrite magnet and JBL switched over to Ti diaphragms for greater reliability.



Also, what effect would there be if I was to use a 2420 instead of either a 2421B or 2425J? Would I need to modify the Crossover to accommodate this change? Thanks in advance!I don't know the definitive answer to this, but it would likely work. The performance would not be identical to the system as designed. That said, virtually all LE85s and 2420s will likely need new diaphragms at this point and only the 2421B or 2425 diaphragms are now available.


All that said, your asking such fundamental questions makes me wonder if it is smart for you to be taking on such a project without doing a lot more research and having a better understanding of the fundamentals of speaker design in general and of vintage JBLs in particular. You will be spending a lot of time and money on this project and there is no guaranty that you will be successful. Buying a new system such as the 4365 or a properly refurbished 43XX system will be a safer investment. I would not recommend your buying a JBL clone as you will never know if it is really an accurate clone or a "looks like" clone.


Widget

[XRT22]

The 2421B has an aluminum diaphragm which many feel sounds better, but this is not universal. The 2425J was created to mimic the 2421B with a ferrite magnet and JBL switched over to Ti diaphragms for greater reliability.


I don't know the definitive answer to this, but it would likely work. The performance would not be identical to the system as designed. That said, virtually all LE85s and 2420s will likely need new diaphragms at this point and only the 2421B or 2425 diaphragms are now available.


All that said, your asking such fundamental questions makes me wonder if it is smart for you to be taking on such a project without doing a lot more research and having a better understanding of the fundamentals of speaker design in general and of vintage JBLs in particular. You will be spending a lot of time and money on this project and there is no guaranty that you will be successful. Buying a new system such as the 4365 or a properly refurbished 43XX system will be a safer investment. I would not recommend your buying a JBL clone as you will never know if it is really an accurate clone or a "looks like" clone.


Widget

Thank you for a comprehensive response. Yes, will definitely need to do more research. Only reason I've asked about the 2420's is because I have been offered some which are in - what seems to be - very good condition and thought I could use these instead of buying 2421B's or 2425s. Perhaps I will start off using these until I can find a set of 2421B's or 2425's to replace them with. Thanks again for your assistance.

[fencki]

Thank you for a comprehensive response. Yes, will definitely need to do more research. Only reason I've asked about the 2420's is because I have been offered some which are in - what seems to be - very good condition and thought I could use these instead of buying 2421B's or 2425s. Perhaps I will start off using these until I can find a set of 2421B's or 2425's to replace them with. Thanks again for your assistance.

i see no problem in try & error.
i did it the same way...
:)

[Nixos]

beautiful work.. look like an original..I wouldn't pick it.. do you have any frequency response measurements?

[Ian Mackenzie]

Sometimes the older Alnico drivers loose a bit of magnetic properties and the throats maybe dirty.

The newer Ti diapgrams are not an exact drop in fit in the older 24202470. The pin holes may need slight filing out.

I would be careful of any old drivers as there are no guarantees.

Mr Widget is right

The scarcity of re cone kits and older drivers is a risk in terms of the original result.

Talk to a JBL service agent like Jands in get them to check all your drivers.

It will eliminate a lot of headaches.

My advice is dont rush it. Its a really big job. Allow 6 months at least.
If you have dont have background in electronics get someone to do the passive crossover, the discrete active crossover and wiring up (me-I accept donations like a case wine)

Dont skimp on the active crossover if you have high expectations

Setting then up can take a while.

But when the are they give the newer systems a run for their money

[fencki]

Sometimes the older Alnico drivers loose a bit of magnetic properties and the throats maybe dirty.

The newer Ti diapgrams are not an exact drop in fit in the older 24202470. The pin holes may need slight filing out.

I would be careful of any old drivers as there are no guarantees.

Mr Widget is right

The scarcity of re cone kits and older drivers is a risk in terms of the original result.

Talk to a JBL service agent like Jands in get them to check all your drivers.

It will eliminate a lot of headaches.

My advice is dont rush it. Its a really big job. Allow 6 months at least.
If you have dont have background in electronics get someone to do the passive crossover, the discrete active crossover and wiring up (me-I accept donations like a case wine)

Dont skimp on the active crossover if you have high expectations

Setting then up can take a while.

But when the are they give the newer systems a run for their money

ian you are totally right.
i took my time and it was the very fun part of the building...
i enjoyed the hours of the build and planning. even if i was confused and frustrated...

thx again for your help...
:-))

[fencki]

beautiful work.. look like an original..I wouldn't pick it.. do you have any frequency response measurements?

i will post some measurements in a few days when i am back home...
i made one measurement from listening position when i fired them up and made my config and setup....

and i feel like the passive crossover is getting better from day to day... i think i can hear very small improvements from the beginning.
but maybe i am only fascinated by the result of my built.

[Ian Mackenzie]

I have offered XRT22 an audition and support when my new new house is completed in 3 months

I made sure main room is 9.5 x 5 x 3.3 (L x W x H m) is big enough.

We will do it when my wife is away.....Lol

[berga12]

Rush in those Kind of project it's risky...

I started my 4355 only with my 2441 coming from previous system.

It took....3 months for the 077
6 months for 2202h
nearly 1 year to find 2235 in Europe with Original Cone never reconed.

An hell of research, demand, questioning, checking, waiting and...........Sweating after huge payments and waiting for the parts all over the world!!!


Finally, this was a funny part of the project :)

[fencki]

An hell of research, demand, questioning, checking, waiting and...........Sweating after huge payments and waiting for the parts all over the world!!!


Finally, this was a funny part of the project :)


i can remember when i was buying the 2245 and 2405 and waiting for them
didn´t know if they were good or not.

but everything was fine in the end.

and i found original 2122 after 6 months of search.
this was the hardest path....
now i have all the original parts.

i still want to try out 2421b to compare with the 2425j..
but i can wait.
:)

[XRT22]

I have offered XRT22 an audition and support when my new new house is completed in 3 months

I made sure main room is 9.5 x 5 x 3.3 (L x W x H m) is big enough.

We will do it when my wife is away.....Lol


Looking forward to it Ian! Question is... do I bring with me a red or a white? Or one of each?

If you are interested, I'm happy to repay the favour and have you audition my Mac XRT22's. They're no 4345's but they're pretty good.

My 2245's and 2122's have now arrived and look awesome! No turning back now! :-)

[Ian Mackenzie]

One of each...Lol

It's great to see that these older vintage designs garner an going popularity since l first looked at the 4345 15 years ago.

A bit of history........

The consensus was the 43xx were harsh and glarey.

Back then there was not much information on the 43xx four ways and l busy working on the crossover for the 2344 bi radial with Robert Hamel. Robert and l were arguing how it should work as all l had was the 4430-35 white paper and no schematics.

It sounded pretty good on my diy Pass Aleph 2s burning 600 watts at idle.

At the time l had built a three way monitor with Altec 515 woofers, an Audax eight inch paper mid and a pair of 2420 drivers for my 2344s l found on eBay.

I was not happy with the woofers so l got hold of some 2245 woofers

At time considering a 4345 clone was only an idea.

But it was something l had to do having built a pair of 4343s when l was a young 20 year old about in 1979.

I did try and get details of the 4343 crossover but Gary Margulius politely declined!

So l build my 4343 crossover using text books graphs and adjusted it by ear. They quickly got a reputation as being way better than anything at the TV station where my brother worked.

We were all a newish Lansing forum members back in 2002 and l asked Bo Putnam to place a tape measure on his authentic 4345s so l could draft up a drawing for the enclosures.

Bo was actually really good about it.

With a basic box design l soon found a pair of 2122h mid cone drivers on a jbl tent sale

Because the drivers were NOS I was unaware the cones were starting to delaminate about 3 months after l installed them

I had them recone by Jands under warranty by JBL Northridge because they were for all intensive purposes replacement drives for a JBL monitor. I got lucky.

The message here is you can't be too careful with old drivers.

The next challenge was the crossover

There was no information

I took a punt to sent a email to JBL at Northridge asking if they could provide details of the crossover ?

To my amazement Greg Timbers kindly emailed me the engineering data sheets and advised on how to tune the bass enclosure and set up the 2234a active filters. Greg was chuffed someone was actually interested in making a pair

Then Giskard and Greg worked together on the original equivalent 3145 crossover as the tapped crossover inductors were no longer available

I found the other drivers and bought a Jasper circle jig.

The baffle was a real challenge.

The crossover used Hovlands as l recall and that crossover ultimately found its way into Robert's system.

Back this was radical a daring project. Most people were focusing on the 4333 or the 4355.

I actually compared the 2344 and the 2307/2308 and slot back and forth and arrived at the conclusion l preferred the later on my genre of music (jazz)

I did a very similar comparison at John Nebels home where John had both the 4343 and the 4435 in one large room . I arrived at the same conclusion and as l recall we agreed the 4435 was better on classical music.

I later learned the 4435 had the dual 2234 woofers which are 2235 without the mass ring. The 2234 has significantly better midrange articulation than the heavier 2235.

With really good amps (diy Pass Aleph) and good caps (the Hovlands) the much maligned reputation of the horn, lens and slot was not present to my ears!

But of course who else had a diy Pass Amp and was mad enough to spend $600 on Hovlands.

Getting the Lpads set was a pita. Eventually l came up with a scheme to adjust the Lpads using a Tandy spl meter

That was the start of unleashing the potential of these systems.

I then put more thought into the active crossover and built a discrete class A design that porschedman has in CA has.

After much collaboration and listening Ed agreed with my appraisal that all things being equal a high quality full passive crossover was inherently more musical than attempting to bi amp with a less than optimal active crossover (a PA crossover)

https://www.passdiy.com/gallery/projects/125/ian-mackenziediy-high-low-crossover

Note we were and are using Pass Labs amp through out that are audibly a brilliant match on these JBLs as Kent at Pass concers based popularity among other JBL owners. You don't of course need to buy a factory amp if you go the diy route.

This is of course our opinion but blind testing suggests it's not placebo.

[XRT22]

One of each...Lol

It's great to see that these older vintage designs garner on going popularity since l first looked at the 4345 15 years ago.

A bit of history........

The consensus was the 43xx were harsh and glarey.

Back then there was not much information on the 43xx four ways and l busy working on the crossover for the 2344 bi radial with Robert Hamel. Robert and l were arguing how it should work as all l had was the 4430-35 white paper and no schematics.

It sounded pretty good on my diy Pass Aleph 2s burn 600 watts at idle.

At the time l had built a three way monitor with Altec 515 woofers, an Audax eight inch paper mid and a pair of 2420 drivers for my 2344s l found on eBay.

I was not happy with the woofers so l got hold of some 2245 woofers

At time considering a 4345 clone was only an idea.

But it something l had do having built a pair of 4343s when l was a young 20 year old about in 1979.

I did try and get details of the 4343 crossover but Gary Margulius politely declined!

So l build my 434 crossover using text books graphs and adjusted it by ear. They quickly got reputation as being way better than anything at the TV station where my brother worked.

We were all a newish Lansing forum members back in 2002 and asked Bo Putnam to place a tape measure on his authentic 4345s so l could draft up a drawing for the enclosures.

Bo was actually really good about it.

With a basic box design l found a pair of 2122h on a jbl tent sale

The next challenge was the crossover

There was no information

I took a punt to sent a email to JBL at Northridge asking if they could provide details of the crossover ?

To my amazement Greg Timbers kindly emailed me the engineering data sheets and advised on how to tune the bass enclosure and set up the 2234a active filters. Greg was chuffed someone was actually interested in making a pair

Then Giskard the and Greg worked together on the original equivalent 3145 crossover as the tapped crossover inductors were no longer available

I found the other drivers and bought a Jasper circle jig.

The baffle was a real challenge.

The crossover used Hovlands as l recall and that crossover ultimately found its way into Robert's system.

Back this was radical a daring project. Most people were focusing on the 4333 or the 4355.

I actually compared the 2344 and the 2307/2308 and slot back and forth and arrived at the conclusion l preferred the later on my genre of music (jazz)

With really good amps (diy Pass Aleph) and good caps (the Hovlands) the much maligned reputation of the horn, lens and slot was not present to my ears!

But of course who else had a diy Pass Amp and was mad enough to spend $600 on Hovlands.

Getting the Lpads set was a pita. Eventually l came up with a scheme to adjust the Lpads using a Tandy spl meter

That was the start of unleashing the potential of these systems.

I then put more thought into the active crossover and built a discrete class design that porschedman in CA has.

After much collaboration and listening Ed agreed with my appraisal that all things being equal a high quality full passive crossover was inherently more musical than attempting to bi amp with a less than optimal active crossover (a PA crossover)

Note we were and are using Pass Labs amp through out that are audibly a brilliant match on these JBLs as Kent at Pass concers based popularity among other JBL owners. You don't of course need to buy a factory amp if you go the diy route.

This is of course our opinion but blind testing suggests it's not placebo.
That's some fascinating history Ian! With stories like that, I'm gonna have to bring 2 of each!

[Ian Mackenzie]

I have edited my previous post to add some additional comments and a link

It's a better read now.

Of late there have been a number of pms seeking technical support about the 4343-4345 and other things to achieve nirvana.

I am at a point now where l am in a position to spend more time researching on the 43xx four ways and the 443x bi radial monitors with a focus on how to obtain the absolute pinnacle of performance.

This may include providing a dedicated support via a web site that specializes in this specific area with new insights, a consolidation and update of my previous posts and articles re written specifically for the JBL 43xx and 443x owners and of course links to key existing Lansing forum data.

[focalguy]

Ian,
That website would be a great idea! You may want to publish all the schematics for charge coupled versions for the 43xx.
crossing my fingers!



I have edited my previous post to add some additional comments and a link

It's a better read now.

Of late there have been a number of pms seeking technical support about the 4343-4345 and other things to achieve nirvana.

I am at a point now where l am in a position to spend more time researching on the 43xx four ways and the 443x bi radial monitors with a focus on how to obtain the absolute pinnacle of performance.

This may include providing a dedicated support via a web site that specializes in this specific area with new insights, a consolidation and update of my previous posts and articles re written specifically for the JBL 43xx and 443x owners and of course links to key existing Lansing forum data.

[tjm001]

For use in a 4345 clone it is apparent that 2123s are easy to come by, but 2122s are becoming extremely rare and expensive. My question is to those that have started out with 2123s and then switched to 2122s. What was your perceived and/or measured sonic difference if any? Other than for strictly purist reasons do you think it is worth the expense and effort to go with the 2122s?:crying:

Thanks.

Tom

[Ian Mackenzie]

That is an excellent question and a response requires diplomacy and a considered approach

Another persons opinion is not always useful.

You should refer to GTs comments in the designers post.

Link to designer post

http://www.audioheritage.org/vbulletin/showthread.php?10613-4345-Includes-Designer-s-Post

I have used both but do not have the 2122 on hand to make a direct comparison

When set up correctly the 2123 is excellent. Getting the crossover right and careful setting up is often the unpredictable factor when attempting to compare drivers.

I would then try and hear another members system with the 2122 and decide from there.

Otherwise l would stick with the 2123.

Ian


Greg Timbers comments

Quote

" I noticed a comment earlier in this string regarding the 2122H. It is a really good voice transducer. It always has been and always will be. Things just sound really natural through it. Another one that might be slightly better is the 2123. It is a little less smooth but perhaps a little more realistic on voice. Either are really good for that critical range from a few hundred Hz to about 1500 Hz."

[Chas]

The great thing about the 2123 is there no foam surround that would suffer from degradation over time. Both are great drivers, with the appropriate crossover and set up.

[tjm001]

That is an excellent question and a response requires diplomacy and a considered approach

Another persons opinion is not always useful.

You should refer to GTs comments in the designers post.

Link to designer post

http://www.audioheritage.org/vbulletin/showthread.php?10613-4345-Includes-Designer-s-Post

I have used both but do not have the 2122 on hand to make a direct comparison

When set up correctly the 2123 is excellent. Getting the crossover right and careful setting up is often the unpredictable factor when attempting to compare drivers.

I would then try and hear another members system with the 2122 and decide from there.

Otherwise l would stick with the 2123.

Ian


Greg Timbers comments

Quote

" I noticed a comment earlier in this string regarding the 2122H. It is a really good voice transducer. It always has been and always will be. Things just sound really natural through it. Another one that might be slightly better is the 2123. It is a little less smooth but perhaps a little more realistic on voice. Either are really good for that critical range from a few hundred Hz to about 1500 Hz."
Thanks you pretty much reinforced my gut feelings on this issue. I'd still like to hear from a few others that actually did this.

Tom

[Ian Mackenzie]

Beware

Of course nothing can stop a 5 year kid pocking the dust cap.

They love doing it like it was meant to happen

Out comes the vacuum cleaner suction pipe.....Lol
OMG

[powerjbl]

Nice to meet you all.

Can someone provide me with an up to date parts list for the closed couple crossover for 4345 by Giskard

I'm trying to find someone to build it for me as I really don't have experience or knowledge to build it.

2405
2425
2122
2245
N 1200 ( came with cabinet)
Sansui ec 146 Cabinet
Any suggestions welcome
Thank you

[fencki]

I have edited my previous post to add some additional comments and a link

It's a better read now.

Of late there have been a number of pms seeking technical support about the 4343-4345 and other things to achieve nirvana.

I am at a point now where l am in a position to spend more time researching on the 43xx four ways and the 443x bi radial monitors with a focus on how to obtain the absolute pinnacle of performance.

This may include providing a dedicated support via a web site that specializes in this specific area with new insights, a consolidation and update of my previous posts and articles re written specifically for the JBL 43xx and 443x owners and of course links to key existing Lansing forum data.

hi ian.
many thanks for your pro comments here.
very very interesting.
i salute you and your technical skills and know how and skill about the JBL monitors

[fencki]

Nice to meet you all.

Can someone provide me with an up to date parts list for the closed couple crossover for 4345 by Giskard

I'm trying to find someone to build it for me as I really don't have experience or knowledge to build it.

2405
2425
2122
2245
N 1200 ( came with cabinet)
Sansui ec 146 Cabinet
Any suggestions welcome
Thank you

do you have the drivers above in your possesion?
what components do you want to use?
where do you live?