2. speakers
  3. 155101-88029

Eminent Technology LFT 7 !!

Not a missprint!  LFT 7 was the LFT 6 with additional bass panels. The bass panels had 3 bass drivers per panel.  4 panels total.  Would like to hear them or purchase them.  
128x128riverdinaudio
bdp24's avatar
bdp24
9,715 posts
 

@gstewtoo, great to hear from another planar fanatic, especially of the Eminent Technology stripe! Bruce's speakers are ridiculously under-acknowledged and appreciated, aren't they? I'm still hoping to eventually snag a pair of LFT-6, but until then my LFT-4 and -8b will have to do. ;-)

Did you do the x/o upgrades yourself? I would like to eliminate them altogether, and use my First Watt B4 x/o in place of the speaker level filters, but Thigpen's x/o's are not textbook designs: they employ driver-compensation elements that the B4 can't replicate. Still, just bi-amping them with the B4 should produce a worthwhile improvement.

riverdinaudio's avatar
riverdinaudio OP
41 posts
 
As of last week my Eminent Technology stable is a pair of LFT3, pair of LFT6, 4 sets of LFT8 and two new LFT 8 panels.  My current project involves using the LFT8 panels with a Magnepan True Ribbon tweeter and GR Research Servo Sub stack.  Also working on an improved support for the LFT3.  How wonderful it is to find kindred spirits.  The Magnepan Ribbon tweeter IS without equal and I never have understood why people do not use it instead of complicated tweeter line arrays.  Magnepan will sell you a pair!
Greg, you made my mouth water with your saga.  More power to you!  I do belive that once one gets to 100Hz a correctly damped cone driver is the only way to go.  My Audio Artistry Beethovens have 4, 12 inch equalized woofers per side below 100Hz and it is a revelation of what true foundational bass is.   Hopefully, mag
riverdinaudio's avatar
riverdinaudio OP
41 posts
 
...nepan will someday complete their plan to blend quasi-ribbon panels with equalized cone woofers.  Currently called the Condo 30.7.  But that is a another thread.  Back to my recently acquired LFT3s.  The previous owner suggested they were best at lower volumes.  I will soon know for sure.  The LFT6 may or may not need bass assistance depending on taste.  As a long time Magnepan owner the LFT6 bass was fine for me.  
bdp24's avatar
bdp24
9,715 posts
 

@riverdinaudio, agree about the Maggie ribbon tweeter. I have a pair of Tympani T-IVa's, which contain it. I never though of using it in place of the ribbon tweeter in the LFT-8b, as that ribbon is used only for the top octave. When I get the time, I'm gonna place the T-IVa m/t panels beside the LFT-8b panels, compare the two tweeters. Thanks for the idea!

There are a group of guys on the Planar Speaker Asylum Forum who had removed the midrange driver from the T-IVa, replacing it with multiple NEO8 drivers (seven, iirc). Haven't heard them myself, but reports are very positive.

I failed to mention it above, but the GT Audio Works sub is nothing more than the GR Research/Rythmik OB/Dipole Sub kit installed in their own H-frame, not visa versa. Credit where credit is due! The sub came from the fertile mind of GRR's Danny Richie, a long-time proponent of OB loudspeakers and subs. When he learned of Rythmik Audio Brian Ding's new servo-feedback sub system, he thought mating it with an OB woofer (which are designed specifically for that application, different from those designed for non-OB use) would create a new SOTA sub/woofer, and got to work on the design.

The sub uses the Rythmik A370 plate amp, into which Brian Ding installs a dipole cancellation-compensation network (a simple single-pole/1st-order low-pass filter). Danny designed the woofer, which is the Rythmik 12" paper cone woofer optimized for OB usage.

riverdinaudio's avatar
riverdinaudio OP
41 posts
 
At the 2019 Capital Audiofest I looked into the back of the GT Audio Works woofer stack and realized i could build my own for pennies on the dollar sine they are GR Research re-badged.  Pleae understand, the GT Audio Works system is a work of art and love.  I am a fan!
Many years ago I used the Magnepan 60" ribbon tweeter with the BG Radia 75" ribbons and generic sub.  Could never get it to blend and at the time my reference was a Magnepan MG20.  Even Magnepan had trouble blending their tweeter to there original wire on membrane design.  

More to discover