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In Reply to: RE: "Will" of SLOG posted by Lew on May 05, 2014 at 13:47:56
Lew
I'm very sorry to hear we lost another planar guru even tho I didn't know him. I didn't even realize a Soundlabs owners group existed.Speaking of transformers,I did buy the Menno Vanderveen for my Monolith 2s from Plitron back in 2007.I then got my new CLXs so I parked the Monoliths..The new ones have Italian made toroids and I know if MasterSound made them or not but I would love to find out.
Honest amplification is better than excessive 2nd order distortion anytime.
Follow Ups:
The idea of Will's (and then my) quest was (1) to increase the input impedance of the SL speakers, so they can be driven better by our OTLs, and (2) in the process, to increase efficiency, which was dreadfully compromised by the RC network used by SL, where the parallel value of R ranged from 4-5 ohms to 8 ohms, over the years as they changed it quite often. There was also scuttlebutt that the toroidal treble transformer "needed" the parallel R, in order to function properly. (I can no longer parrot their rationale for that.) Substitution of the treble transformer with a full-range transformer enabled Will (and I) to do away with the RC network entirely. Thus in one fell swoop both goals were achieved. In the standard Sound Lab set-up, there is also a low value inductor in front of their bass transformer. Will found that one cannot just do away with the SL bass transformer; both it and the AU90 transformer in parallel are necessary to derive a full bass response from the big speakers. Will did however eliminate the inductor, whereas I have not; I use a 12-ga 1.5mH Alphacore air core inductor in series with the bass transformer. Either way, the results were and are transformative. I measured the impedance v frequency on my speakers with the modified set-up, and across the frequencies from 50Hz to 2000Hz, it does not dip below 20-25 ohms. At 5kHz it's about 8 ohms and gradually rolls off at 10kHz and 20kHz. Roger West pointed out to me that there is a sharp impedance (not frequency response) peak between 200Hz and 300Hz. Big deal! If it's there, it causes zero problems for my OTL amplifiers.
The problem with Martin-Logan speakers, and why I have stayed away from them ever since the CLS II, is similar; they are designed for solid state amplification. Further, the audio step-up transformers they used (in the CLS, don't know about now) were puny. What's inside the CLX?
I was aware of that problem of running better with SS amplification but it never a problem with me because I miraculously avoided those years where that happened.I have the old Monolith 2s and now the CLXs have two torroids in them where the Monoliths have one and they went to a multipanel setup.I run the Citation 2s with McShane mods strapped in mono and they are pretty stable.I will try to get a picture of then inside of the network.
Honest amplification is better than excessive 2nd order distortion anytime.
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