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Eminent Technology LFT8B’s reversing woofer polarity

Hi,

I have a pair of the Eminent Technology LFT8B’s and read Dr. Robert E Greene review in the Absolute Sound magazine (2014 I believe) of the speakers where in the review he reversed the polarity of the woofers and said it made a significant improvement. He was going to give the speakers a mediocre review (his words) before doing this and after reversing the woofer polarity he then said they were significantly better and proceeded to give them a rave review. Have any LFT8B owners out there ever tried this? Thank you.

Scot
scothurwitz
douglas_schroeder
3,281 posts
 
I suspect there may have been something wrong with the review pair for that to be effective. 

I reviewed the LFT-8A/B for Dagogo.com  and owned it, even did the "stacked" pairs for a while which was fun.

NO way that speaker gets mediocre rating for its design, build, sound and cost. I think there was something terribly wrong in previous review ( didn't read it, don't care to) to arrive at such a conclusion.   YMMV
bdp24's avatar
bdp24
10,285 posts
 

To turn the LFT-8b in an absolute giant-killer (actually, even in stock form it is), use a pair of GR Research/Rythmik OB/Dipole Subs in place of the LFT’s 8" woofers. Unlike "normal" subs, the OB/Dipole will play up to the 8b’s x/o frequency of 180Hz.

Until you do that, there is a remedy for the resonance in the 8" woofers output (in the 1k-1.5kHz range, way above it's x/o frequency), heard as a low-level "whistle". "Davey" has posted on The Planar Speaker Asylum a simple, cheap low-pass filter that suppresses that resonance to the point of inaudibility. It is just a single cap and resister, placed across the woofer's terminals (on the back of the woofer, not the speaker terminals).

ledoux1238
341 posts
 
I am a newbie to the LFT-8b's having installed them for a little over a month. Robert Greene's review was fresh on my mind when I reversed polarity on the woofers. Expecting some kind of transformation, I heard none! I did it twice, once a week in, and then a few days ago with about 200-250 hrs on the speakers. ( Yes, I've been listening non-stop! )

To be honest, I really wasn't expecting anything major. The speakers wired in their correct polarity was, for me, extremely engaging. I spent most of my time on speaker placement which proved most enlightening. 

BTW @bdp24 turned me onto the ET's. I put the same question to him on another post. And It was Doug's review that moved things forward, having  no dealers nearby. 
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