In Reply to: RE: Good Experience with FMODs posted by Dimitry on November 19, 2015 at 17:08:18:
Can you point me to the measurements on the ET site showing this? (I can't find them.)
I see a graph on this page, but it looks like a dip at 1khz, not a peak.
http://www.eminent-tech.com/LFT8specs.html
A 2nd-order (FMOD) filter introduces a group-delay into the woofer path of about 600usec. (Equivalent to about 8 inches.) Any square-wave performance you might have had in that region is degraded when you do that.
Also, the reverse polarity preference noted by REG provides a much better phase match to the midrange driver in the crossover region, but it would degrade the advertised square wave performance too. I'm not sure why that's considered a matter of preference. It's an objective change to the system design.
Anyways, your solution only works for those that are bi-amping.
Fashioning a simple trap into the stock woofer filter could easily address a cone resonance issue. Why has Bruce not implemented that?
Always there are trade-offs with speakers. :)
Dave.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Good Experience with FMODs - Davey 19:33:32 11/19/15 (20)
- RE: Good Experience with FMODs - Dimitry 05:39:21 11/20/15 (19)
- RE: Good Experience with FMODs - Davey 06:38:45 11/20/15 (18)
- RE: Good Experience with FMODs - Dimitry 07:32:04 11/20/15 (17)
- RE: Good Experience with FMODs - Davey 08:07:32 11/20/15 (16)
- RE: Good Experience with FMODs - Dimitry 10:35:34 11/20/15 (15)
- RE: Good Experience with FMODs - Davey 08:48:29 11/23/15 (14)
- RE: Good Experience with FMODs - Dimitry 14:06:51 11/23/15 (13)
- RE: Good Experience with FMODs - Davey 15:40:25 11/23/15 (12)
- RE: Good Experience with FMODs - Dimitry 20:12:22 11/23/15 (11)
- RE: Good Experience with FMODs - Davey 14:14:25 12/10/15 (10)
- RE: Good Experience with FMODs - josh358 05:45:45 12/11/15 (9)
- RE: Good Experience with FMODs - Davey 10:49:21 12/13/15 (8)
- RE: Good Experience with FMODs - josh358 11:53:59 12/13/15 (6)
- RE: Good Experience with FMODs - Davey 07:28:11 12/14/15 (5)
- RE: Good Experience with FMODs - josh358 09:08:47 12/14/15 (4)
- RE: Good Experience with FMODs - Davey 09:37:01 12/14/15 (3)
- RE: Good Experience with FMODs - josh358 18:59:31 12/14/15 (2)
- RE: Good Experience with FMODs - Davey 08:24:16 12/15/15 (1)
- RE: Good Experience with FMODs - josh358 08:52:02 12/15/15 (0)
- RE: Good Experience with FMODs - Satie 11:26:28 12/13/15 (0)