DIY "4345" Project

[4313B]

For one thing the 2452H-SL is an "8 ohm" diaphragm and the 2445J's I have had "16 ohm" diaphragms in them...


I've been asked by several people what I would sell these for whole rather than part them out. I honestly don't know right now. All the drivers are fresh as are the charge-coupled bi-amp only networks so they do have some value. I guess I'll decide after I try the last generation 4345 cc networks, along with fresh 2122H's.

I do know that it is highly unlikely that I will have room for them in the near future. I'm fast running out of space and am going to have to switch several rooms around, none of which are very hospitable to large loudspeaker systems.

[dkalsi]

I guess I'll decide after I try the last generation 4345 cc networks, along with fresh 2122H's.I do know that it is highly unlikely that I will have room for them in the near future.

Looking forward to both (i) the 4345cc networks, and (ii) your potential decision to sell the speakers.

Cheers,
D

[4313B]

While I am busy finishing up all the 4355 networks I am building for guys who have been waiting far too long I ordered all the parts to build a pair of full passive charge coupled 4344/4345 networks this past Monday. The order is backordered until the end of March though. I will definitely have all the 4355 networks done by then and can then build this prototype 4344/4345 pair for confirmation. Once confirmed, I can build all the 4344/4345 pairs that folks have been patiently waiting for.

[dkalsi]

While I am busy finishing up all the 4355 networks I am building for guys who have been waiting far too long I ordered all the parts to build a pair of full passive charge coupled 4344/4345 networks this past Monday. The order is backordered until the end of March though. I will definitely have all the 4355 networks done by then and can then build this prototype 4344/4345 pair for confirmation. Once confirmed, I can build all the 4344/4345 pairs that folks have been patiently waiting for.

4313B,

Thank you for the update. Could you please share how much the total cost was for the parts for the 4344/4345 networks (but only if you want to disclose that information).

Cheers,
Dhar

[dkalsi]

The order is backordered until the end of March though.

Hey 4313B,

Just wanted to follow up an see whether you received the parts for the 4345 networks. Please let us know.

Thanks,

Dhar

[4313B]

I received the last few inductors on Tuesday. I hope to start building them next weekend.

I also need to recone a pair of 2122H's.

[dkalsi]

I hope to start building them next weekend.

[4313B]

I'm kind of tempted to whip up a 2234H version of this system format. The 2234H in a 3.75 cubic foot enclosure tuned to 30 Hz along with a 30 Hz high pass (Q=2) filter such as the 5234A, 5235 or DX-1 can provide should yield very nearly the same bandwidth and efficiency of the 2245H in less than half the enclosure volume. It should trump the 2235H in the larger ~ 5 cu ft 4344 box.

[hjames]

I'm kind of tempted to whip up a 2234H version of this system format. The 2234H in a 3.75 cubic foot enclosure tuned to 30 Hz along with a 30 Hz high pass (Q=2) filter such as the 5234A, 5235 or DX-1 can provide should yield very nearly the same bandwidth and efficiency of the 2245H in less than half the enclosure volume. It should trump the 2235H in the larger ~ 5 cu ft 4344 box.

Very interesting - thanks!
I'd replaced the 2234s that were in the 4341s I bought with 2235s,
and moved the 2234s into L200 cabinets.
It seemed like both systems got better bass in the process -
(but of course, I haven't rebuilt the crossovers in the 4341s yet).

[Ian Mackenzie]

I'm kind of tempted to whip up a 2234H version of this system format. The 2234H in a 3.75 cubic foot enclosure tuned to 30 Hz along with a 30 Hz high pass (Q=2) filter such as the 5234A, 5235 or DX-1 can provide should yield very nearly the same bandwidth and efficiency of the 2245H in less than half the enclosure volume. It should trump the 2235H in the larger ~ 5 cu ft 4344 box.

Great idea if space is an issue which it normally is but is won't play as loud and will have higher distortion (apparently)

[dkalsi]

I'm kind of tempted to whip up a 2234H version of this system format. The 2234H in a 3.75 cubic foot enclosure tuned to 30 Hz along with a 30 Hz high pass (Q=2) filter such as the 5234A, 5235 or DX-1 can provide should yield very nearly the same bandwidth and efficiency of the 2245H in less than half the enclosure volume. It should trump the 2235H in the larger ~ 5 cu ft 4344 box.

I apologize for my ignorance, but are you suggestions that you would like to build a crossover for a DIY 4345 system that uses the 2234H as oppose to the 2245H? - or is the crossover going to be the same both versions- or are you plan on building x-overs the the 2234H version first, and then the 2245H version?

Please let me know as I am eagerly awaiting crossover schematics for the DIY 4345 (with 2245H woofers, and 2441 mids).

Thank you once again for all your efforts,
Dhar

[4313B]

No. No. No.

I was just thinking aloud. Some folks will know exactly what I am talking about and I would be surprised if anyone actually tried it.

Besides... the 124H, 2203H, LE14H, 136H, 2231H, 2234H, 2235H and 2245H are all electrically similar so there is no difference in the low pass 4344/4345 schematic.

[dkalsi]

No. No. No.

I was just thinking aloud. Some folks will know exactly what I am talking about and I would be surprised if anyone actually tried it.

Besides... the 124H, 2203H, LE14H, 136H, 2231H, 2234H, 2235H and 2245H are all electrically similar so there is no difference in the low pass 4344/4345 schematic.

Ahh...got it... Once again, I apologize for the dumb question.

Thanks,
D

[eso]

4313B posted:

Where does one find the cast aluminum speaker mounting clamps? I haven't been able to find anything but cheesy plastic ones and I really need some good ones for my Urei projects.



eso

[Mr. Widget]

Where does one find the cast aluminum speaker mounting clamps?

Search MA-15, MA15... here and on eBay.

They used to be available directly from JBL Pro Parts... the part numbers are listed in a number of threads here. They may or may not still be available from JBL... they are regularly available on eBay.


Widget