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In Reply to: RE: Built-in woofers... posted by eso on October 04, 2023 at 07:39:07
Had often wondered over the past years what evolution that room had experienced.
Couldn't believe you ripped out previous built in room horn subs to make even newer ones.
Conicals now I see. And as always the quality design details that look exceptional and functional.
What amps and pre are you running now?
I retired 6 years ago so I don't visit the South Bay often.
Extremely glad to see your post and your evolved room. The previous was spectacular too!
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How are you ED? I only demoed the mouths of the horns to reconfigure so I could push the conical midbass back further. The backchambers, throats and first part of the flares are the same.The rear wall is all diffuser now and are the little shelves for the CDs I rarely use.
Pre and Amps are all the same: C-J Premier 17 (now with teflon cap upgrade), Laurel 300B amps With WE tubes and Cy Brenneman fixed bias mods, and the VTL MB-125 of the bass horns.
But with the added room treatments and Cogent mains it is a hole new level from what it was before. The windows are insulated low-E glass and operable now.
All that new millwork was material left over from a custom place I build above Malibu. It's a south American hardwood called Garapa.
eso
They were a carnival of American decay on parade, and they had no idea of the atrocity they had inflicted upon themselves." Henry Chinaski
Edits: 10/04/23
Always a pleasure to see your refined touch on your creations.
I thought you had some Cy creations at one point but possibly bad memory. His stuff was dead quite even on 100 db plus setups.
Are you using the field coils? What power supplies? Always a big point for Mr Schell and Mr Drysdale
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Yes, I have both the DS 1448 midbass drivers and the original DS 1428 midrange drivers. Still using my old Fostex T-925a tweeters.
Since I'm still raising a family I couldn't justify spending on a Tungar power supply for the field coils. So I was using a couple of the pretty good old Radio Shack DC supplies for a while.
And then Pavel-whom you may have met over at Bruce's why back when-designed these tiny little cards that are a current source. I've got modular 20V supplies that can each driver two of the current source cards to maintain a constant 12V to the field coils regardless of what is happening in the VC gap. They are very nearly the quality of a Tungar.
It makes no sense that a field supply would make a big difference but everyone I know that has compared them agrees.
And simple 1st order network with 10Ga inductors and I charge coupled the Soviet PIO caps...
eso
They were a carnival of American decay on parade, and they had no idea of the atrocity they had inflicted upon themselves." Henry Chinaski
Was initially puzzled by each having two sets of connector posts but of course two coils per side.
I think the T92A fits in very nicely as few conventional HF drivers can hit that 100+ db mark, but they sure can.
Glad to know a survivor set of Cogents are in a "every day type guys" hands and not reserved for billionaires jewelry.
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