Upcoming project list of parts.

[Allanvh5150]

Hi all,

Been pondering a summer project for a while and I have collected the following parts.

2245 x 2
2235 x 2
2202 x 1
2123 x 4
2441 x 4
LE85 x 2
2405 x 6
2311 x 1 plus some made locally
2308 x 5

The parts lend themselves to some interesting ideas.

Any thoughts? Allan.

[Mr. Widget]

The parts lend themselves to some interesting ideas.

Any thoughts? Allan.What's your goal? Studio Momitor? High SPL? Audiophile?


Widget

[Allanvh5150]

What's your goal? Studio Momitor? High SPL? Audiophile?


Widget

Hi Widget,

Music / HT. Not really into huge SPL but I am more curious about how these drivers can sound in a home environment.

I want to make the boxes a feature and use some high quality veneer. I am a big fan of quilted maple.

Haven't given crossovers a lot of thought as yet but would probably make the bottom end fully active and make the 2405's
active as well with a chip amp built into the cabinet.

Obviously with the rather large price tag for the drivers and cabinets, things need to be done to reflect that.

Allan.

[Mr. Widget]

I guess I would go with a 2" throated 4345 then... either with the 2311s or give a pair of 2397s a go.

Keep the 2235s for another project and test your duplicate drivers for pairs that most closely match the original spec and each other.


Widget

[Allanvh5150]

That was my thought as well. I have been looking for a pair of 2397's for a while but they seem pretty rare. There are a pair on Ebay now with drivers but the freight is prohibitive. Then being wood, they are probably pretty fragile and coming halfway round the planet, may arrive in pieces. You reckon the 2397 is the better choice?

Allan.

[Mr. Widget]

Cloning the 2397 is relatively easy... there are drawings and tips posted on the Forum. You will need a pair of 2328s but they are virtually indestructible and small enough for reasonable freight.

I prefer the sound of the 2397 to the 2311, but your room should be well controlled as the wide dispersion of the 2397 can be a problem in some rooms. Also the phasing/time alignment is different, but I don't think it matters a lot as none of these solutions are remotely close to phase coherent.


Widget

[Mostlydiy]

Or you might get yourself another pair of 2235 and another 2202 and go for the kenrick 4351. Its not tru JBL but as I see it its more or less a 4355 with the drivers scramled around a bit. If you get those missing pars though, you might as well build the 4355. Just trying to come up with ideas. I would probably also go with Mr Widgets suggestion I think.

60304

/Mostly

[Allanvh5150]

Nice idea. Not sure I want to have 2 4355's in my house. However, a pair of 4345's for the standard L/R channels and a vertical 4355 for centre and sub duties could be a cunning plan.
I am looking at the idea of getting a pair, or 3, 2397s and integrating them into the cabinets. Nota as easy as it sounds though.

At this stage I will be starting with the pair of 4345's and get those right.

Allan.

[Allanvh5150]

Cloning the 2397 is relatively easy...
Widget

I just managed to score a 2397 and throat locally for $80!

Allan.

[Mr. Widget]

I just managed to score a 2397 and throat locally for $80!

Allan.That is a score!

Good luck getting a mate or mates for it.


Widget

[grey]

That's not bad at all. I think I paid ~$150 each for the 2397/throat.

I'm doing this (http://www.audioheritage.org/vbulletin/showthread.php?33307-Drew-Daniels-ANCIENT-AUDIOPHILE-system) with the 2397 incorporated.

You have enough parts to trade off in favor of what you would need for drivers.
There is obviously several hurdles with this beyond collecting drivers.

[Allanvh5150]

Received a 2405 from Ebay today. Perfect condition and working order. $150 +freight. These things were like rocking horse poo a few years back. Now it seems they are giving them away.

Allan.

[Allanvh5150]

CNC programs are done and material is at hand. Hopefully in 2 weeks I will begin machining the panels.

Allan.

[Lee in Montreal]

Keep the pair of 2245 in separate 10cft cabinets

You may want two 2235 per cabinet for better efficiency. Perhaps one woofer would have an extended range, while the otherwould only do 20Hz to, say, 60Hz. Extra woofer plus coupling shall get you 6db bump in that range.

http://img.photobucket.com/albums/v668/Lee_Vuong/JBL parts factory/Capturedrsquoe3010cran2014-08-22a3000175744_zps0d08b331.png

[macaroonie]

My oh my that lot could make a big noise with the right power behind it. :)

[Lee in Montreal]

So, Allan. What are your "plans" (pun intended). BTW I checked the specs of the 2123 and found it to be a strange beast. Might not be easy to integrate as it seems its range is 300Hz to 4Khz. Not low enough to integrate with the 2245, and not high enough to meet the 2405. Matched to a 2397, it would have a narrowband of 300Hz-1KHz.

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=46911&stc=1&d=1281036846

What are your thoughts?

[Allanvh5150]

Hi Lee,

At this stage I have enough drivers to build a 4355, a pair of 4345's and a pair of 4344's. I will be using the 2441's above the 2123's so they will not need to extend to the 2405's. I was thinking to do the 4355 and 4345's standard but have a 2397 sitting on top. I am not sure at this stage if the setup will be fully active or not.

Allan.

[sonofagun]

Don't forget grilles :)

[Allanvh5150]

There will be grilles, do not worry. Here is the plug plate that I will be machining out of aluminium.

63040

[ivica]

So, Allan. What are your "plans" (pun intended). BTW I checked the specs of the 2123 and found it to be a strange beast. Might not be easy to integrate as it seems its range is 300Hz to 4Khz. Not low enough to integrate with the 2245, and not high enough to meet the 2405. Matched to a 2397, it would have a narrowband of 300Hz-1KHz.

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=46911&stc=1&d=1281036846

What are your thoughts?
Hi Lee,

what kind of problem with 2123 would be expected. it seems to me that the region from over 300 to 2000 can be can managed by 2123.

regards
ivica

[Lee in Montreal]

Hi Lee,

what kind of problem with 2123 would be expected. it seems to me that the region from over 300 to 2000 can be can managed by 2123.

regards
ivica

I woudn't cross the 2245 at 300Hz. 200 maybe. It's a big heavy cone...

[ivica]

I woudn't cross the 2245 at 300Hz. 200 maybe. It's a big heavy cone...

Hi Lee,

I would not expect any "recognized-able" difference between crossover at 200Hz vs 300Hz, but under such "constrains" may be 2206 can help in order to "fill the gap" between 200Hz and something over 1000Hz, where VHF driver would become involved. But as 2123 is high efficiency driver ( about 100dB/1W/1m), I believe that some "work" around the mid-bass network would help to allow 2123 to be used...in the project.

Reagrds
Ivica

[Lee in Montreal]

Here's a relevant discussion on the use of 2123 drivers with different crossover frequencies and woofers.

http://www.audioheritage.org/vbulletin/showthread.php?19271-4-way-system-poll

Lee

[Ruediger]

I woudn't cross the 2245 at 300Hz. 200 maybe. It's a big heavy cone...

If the cone had problems at higher frequencies one should see that in the impedance plot. A cone breakup costs energy, that must come from somewhere, and the symptom is a lower impedance at the frequencies in question. I think some drivers of the E-series show that.

To my opinion 300 Hz and even more are not a problem.

Ruediger

PS the impedance plot is in the data sheet in the transducer information forum.