The continuing saga of the charge coupled network

[SEAWOLF97]

this post was interesting, the reasoning ??? (on the highlighted part)

Before closing I should comment briefly about the 250 - 4345 comparison. Simply put, I prefer a 250. I like the bass quality of the LE14 woofer. Alway have and always will. The 2245 when used as a dedicated sub is one of the best sounding woofers ever. It has an amazing blend of speed, pitch and punch. So does the 14" but the 18" is better. Unfortunately the 18" dislike for passive networks hurts it more than the 14" is hurt by a passive network. I think the mid and high range on the 250 is smoother and much more open however the 4345 wins by a bunch in terms of effortless dynamic sound. I have made all of the above changes to 250 systems (except for separate amp on UHF) and the improvement is huge.I have not done so on the 4345 but I suspect that that system will benefit from theses changes more than a 250 would. If both systems were tweaked out to about the same level, I suspect it would be very hard to come up with a clear overall winner, but I think I might lean towards the 4345 as having the greater potential..

[scott fitlin]

They go in place of the capacitors you currently have between your amp and the compression drivers.... you are running protection capacitors on your compression drivers right?

Actually, no I don't, and I have never had problems, I don't blow comp drivers, never really have, either.

But, It is relatively simple enough to do, and six small boards, with caps, and 9v battery, and holder, encased in a small, clear plastic housing that can be mounted to the cabinet under the comp driver is no problem to fabricate.

I'm asking questions, because I have never done this before, and have no experience with it, although it seems intuitively simple enough.

My friend will make them, and they will come out like a factory made product, that can be screwed down to the top of the cabinet, directly under each 2441,s terminals.

[Earl K]

ThankYou 4313B for extending an invitation to Greg Timbers to talk on the subject ( of DC biasing ) .

And ThankYou to Mr. Timbers for accepting and then prompty laying out his thoughts .


<> Earl K

[4313B]

this post was interesting, the reasoning ??? (on the highlighted part)

I think the combination of the aquaplased diaphragms and the biased networks work wonders on the 4344, 4345 and 4355. I've done the 250Ti, 4345 and 4355 in addition to other systems. The 4345 and 4355 are simply more dynamic. What I personally noticed on the 4345 and 4355 was the lowering of the fatigue level whereas the 250Ti just sounded better.

ThankYou 4313B for extending an invitation to Greg Timbers to talk on the subject ( of DC biasing ) .

You are most welcome! I am sincerely in his debt. He has been a remarkable inspiration for many years.

[scott fitlin]

ThankYou 4313B for extending an invitation to Greg Timbers to talk on the subject ( of DC biasing ) .

And ThankYou to Mr. Timbers for accepting and then prompty laying out his thoughts .


<> Earl K

Ditto.

[SEAWOLF97]

What I personally noticed on the 4345 and 4355 was the lowering of the fatigue level whereas the 250Ti just sounded better.

not to belabor , but can you tell me what "better" means in this context ?

[scott fitlin]

More questions, , I got millions of them, too!

I am looking at the Solen film caps, they are available in polypropylene and aluminum foil, polypropylene and tin foil, and teflon and tin foil.

What would you use, and what voltage rating? I power six 2441J on a Crown DC-300A.

http://www.partsconnexion.com/catalo...itorsFilm.html

[Rolf]

What the h.... are we thinking? The man himself, responsible for a lot has spoken. He knows much more than the most of us do.

Thanks Greg for your time to enlighten us once more.

[4313B]

not to belabor , but can you tell me what "better" means in this context ?

Significantly clearer and more three dimensional. Greg's description was "staggering" when we talked about biasing the 250Ti years ago. I'd agree. You might want to PM jblnut about his pair of biased 250Ti's.

[hjames]

Significantly clearer and more three dimensional. Greg's description was "staggering" when we talked about biasing the 250Ti years ago. I'd agree. The older systems just seem to benefit even more and Greg's 4345 and 4355 designs respond particularly well.

So, I could assume that even an ancient system like my 4341s would improve quite a bit with an upgrade to CC networks ... even without the 2245s ...

[4313B]

I thought you basically had 4344 components now Heather...

2235H, 2122H, 2425J, 2405

[hjames]

I thought you basically had 4344 components now Heather...

2235H, 2122H, 2425J, 2405

well, soon ...

still using (most of) the original crossovers and those itty bitty boxes tho ...

[alskinner]

I check this forum everyday in hopes of hearing something from "The Man".

A novice at best, I have the utmost respect and admiration of what it takes to bring a system from scratch to a world class product.

Had it not been for you and some of the heavyweights on this forum, I would not have delved into a hobby that I love.

Thanks and Regards
AL

[4313B]

I am looking at the Solen film caps, they are available in polypropylene and aluminum foil, polypropylene and tin foil, and teflon and tin foil.

What would you use, and what voltage rating? I power six 2441J on a Crown DC-300A.

What is the frequency of the active filter crossover going to the 2441's? These are what you could use:

http://www.parts-express.com/pe/show...number=027-608

http://www.parts-express.com/pe/show...number=027-612

http://www.parts-express.com/pe/show...number=027-616

[scott fitlin]

My horns run 750hz - 7k, 12db butterworth.

OK, thanks, I am looking at your suggestions right now.