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Good Experience with FMODs
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Posted on November 19, 2015 at 11:56:09 | ||
Posts: 457
Location: Massachusetts Joined: January 26, 2006 |
So, my system has gotten complicated, with LFT8Bs now driven by two pairs of mono amps - Canary CA-339s for the planar driver and Emotiva XPA-1s for the woofer. The low frequency amps are driven through MFX10V3 buffer/Goldpoint stepped attenuator box/MFX10V3 buffer. 500 Hz LP FMODs are used at the input of the XPA-1s. Emotivas have a DB more gain than the Canary and the two tube buffers supply maybe 6 db of gain in total. FMODs have about 2-3 db loss. In the end I have a woofer level knob that allows for +3db/-12db control, which is nice to have with some material. Why all this complexity? Well, the LFTs have a small but well audible flaw - the woofer has out of band junk in the 1 Khz range, which makes for a nasal coloration on some voices. 500Hz LP FMODs make this go away, so the speaker sounds really pristine through the entire frequency range. It sounds like FMODs are working well in this application. As an aside, I have not listened to the XPA-1s full range, but the make a dynamite woofer amp. They also appear well built and VERY heavy - over 70 lbs each. Run very warm in Class A mode. Mechanically silent and pretty to look at, if you have the space. They are also "on spec" to the FMOD vague guidance that the rated frequency is achieved with 22K input. |
RE: Good Experience with FMODs, posted on November 23, 2015 at 08:48:29 | |
Here's a better look at the woofer resonance (blue trace) from the Stereophile measurements of the LFT-VII many years ago. Dave. |
RE: Good Experience with FMODs, posted on November 23, 2015 at 20:12:22 | |
Posts: 457
Location: Massachusetts Joined: January 26, 2006 |
True, but it wouldn't be as fun as breaking it! |
RE: Good Experience with FMODs, posted on December 11, 2015 at 05:45:45 | |
Posts: 12327
Joined: February 9, 2010 |
So you went for them! How do you like them overall? |
RE: Good Experience with FMODs, posted on December 13, 2015 at 11:26:28 | |
Posts: 5426
Joined: July 6, 2002 |
So what freq LP FMOD did you get? |
RE: Good Experience with FMODs, posted on December 15, 2015 at 08:24:16 | |
Buzzes, rattles and delamination fixes trump everything else and go to the top of the to-do list. :) Dave. |
RE: Good Experience with FMODs, posted on December 15, 2015 at 08:52:02 | |
Posts: 12327
Joined: February 9, 2010 |
Fixing them is less fun than comparing amps, though . . . :-| |