Eminent Technology LFT-8b in Harry's system


I recently signed up for the V.P.I. Industries newsletter, and today received my first such. In it, Harry Weisfeld reviews a Grado phono cartridge, but this post concerns one of the speakers he listed as being those he uses to listen to music and evaluate recordings through. All but one are traditional dynamic cones/domes in a box designs, only one being a planar/dipole. That planar is the Eminent Technology LFT-8b. I'm pretty sure Harry could, if he so chose, have instead as his sole planar a pair of $6000 Magneplanar MG 3.7i's, or even $14,000 20.7's. But nope, he instead chose the $2500 ET LFT-8b, imo the greatest value in a loudspeaker on the market. I compared it to the 1.7i, and the difference was dramatic.
128x128bdp24

Showing 7 responses by brucefrederick

Has anyone bothered upgrading the caps in the crossover.......Well I have.  
Tweeter cap : Rike S cap 2.2uf
Mid cap: Audyn  true copper 2.2uf
470uf replaced with Clarity cap TC 220ufx2 bypassed with Rike PIO Qcap 3.3uf x2

All I can say it was well worth it.  Everything across the board improved significantly.  I was never quite satisfied with the tone these SOTA drivers gave, but now I am quite sastified. 

Class D SDS470C  modded extensively (previously owned the 350a)
Ming Da MD-6 passive  transformer preamp
Doge 6 CD player


Eric,

The only reason I went with Clarity TC's in exchange for the 470uf electrolytic is they were deeply discounted  at PCX a few years back.  Think I'd go for the Audionote Kaisei bipolar as I have the 63V 10Kuf x6 in my power supply of class D amp and am impressed.

  BTW i just bypassed the mid panel (on the outside) with the Duelund .01uf  silver foil in wax.  Surprisingly, the sound turned more organic and natural. 

My advice would be to use PIO/paper in wax where you can.    The only thing I might change is the tweeter cap to a Jupiter copper foil.  Certain CD's are strident in the lower trebiles......Let your wallet be your guide 
I am curious what Audiogoners are using for speaker wire on the Eminents?  I had been using single run of Xindak FS-1 which I thought was great.  However upon returning to running 2 identical runs  of Straightwire Maestro 10' per speaker I was just shocked what I was missing.  It seems the crossover distortion has also been greatly reduced. Music just starts and stops on a dime.  Maybe its a biwre thing?
With the Covid stay at home order in MI I decided to play around with the .6MH inductor.  I tried the new Jantzen copper foil in wax 14 gauge, which is all the rave.  Sadly, it thinned out the mids with maybe a slight increase in detail.....btw I hooked them up in both directions and they were worse than Bruce's stock 18 gauge magnetic wire air cores which are very good. I debated on ordering the 12 gauge copper foil in wax but decided to go with the Erse XQ 14 gauge perfect lay air coiled inductors.  I'm glad I did as the moment I hit play the mids sounded rich and full like a good tube amp.  The detail was all there and so were the highs.  I did A/B Bruce's inductors and easily identified the Erse's every time.....by the fat juicy midrange.  If you have a large room and are looking for more meat in the midrange than the Erse's are the ticket.   Funny how the change in wire gauge(DCR) can make such a big difference in the mids.  I think the inductor switch is just as significant as changing the 470uf and 4.7uf cap.        
the crossover is mounted on a cross brace(L to R) maybe 8" back from woofer opening.   I replaced all the caps  and have no resistors in the crossover since I am using the hi setting on tweeter.  I would just replace all the caps while the hood is up.


bdp24

I read through many threads regarding the copper foil wax inductors before pulling the trigger. Actually Danny was a fan of Erse inductors FWIW. The Erse’s are a stock item at parts express and cheaper than the copper foil in wax . I forgot to mention that the ET’s sound a lot fuller at low volume levels..... also the new coils tamed the slight harshness in the treble with female voices in many of my cd collection.
I did try bi amping during the stay at home order and maybe noticed a little more clarity and less smearing of nuances and detail.  Overall I think bi wiring gives me  more of an improvement than biamping.  I guess if covid comes back in the fall I'll try an outboard crossover as I have loss some real estate inside the woofer cabinet with the large sized film caps.  Hats off to Bruce Thigpen for putting up with me as I play around with his genius design.  Every email has been most pleasant and gracious.