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In Reply to: RE: Here you go posted by Satie on June 22, 2017 at 12:45:07
"there is a problem of latency and group delay if you eq beyond 1st order. Thigpen is opposed in principle to having detached or delayed time behavior in any of the drivers as that eliminates transient fidelity of the whole speaker and phase fidelity at the crossover region. He thinks it is as important and possibly more so than freq response, noise or resonances. For those that appreciate spatial performance most these are the things that must be preserved, while everything else can be compromised."
Conjecture....regarding his principles??
FYI, the fixes I implemented do not alter this aspect of the design anyways.
Dave.
Follow Ups:
Things he spoke about a couple of decades ago.
Okay. Well anyways, the fixes that need applied don't change that aspect of the design.
Dave.
Davey, would you mind posting your parts list for the woofer fix again? For those who didn't see it when Davey posted it a while back, you will see it is not a x/o, but more of a notch filter, I believe it would be called.
No, it's not a notch filter.
It's simply an RC series network wired across the woofer terminals. A 35uF cap and 1.5 ohm resistor.
Dave.
Beautiful, thanks Dave. Any candidates for your LFT-8b replacements?---Eric.
I've heard from a couple of people offline, but there isn't that many (relatively speaking) of these systems out there, and most owners probably don't frequent this insane asylum. :)
Dave.
I meant speakers to take the place of the LFT-8b's in your system. Maggies? Quads? Dynamics of some sort? I have a pair of LFT-4's I could let go I suppose, though I'm looking forward to comparing them to the LFT-8b's.
I don't know your age Davey, but are you old enough to remember the ESS TranStatic I speakers? An interesting design from the very early 70's (before they came out with the Heil AMT speakers)---a KEF B139 woofer in a transmission-line enclosure, a KEF B110 Bextrene 5" midrange, and a trio of RTR ESL tweeters. I have a pair of them as well. Too many speakers!
Oh, I have multiple speakers available to use. :)A friend has a pair of ET LFT-6's that need repair. I might take on that project next.
I do remember the ESS TranStatic speakers, but never listened to those. I spent some time with Fulton J's and E's back then and also a few of the main RtR models that optioned the electrostatic tweeter schemes....ESR-15 and ESR-6.
Dave.
Edits: 06/23/17
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