One mistake I made when purchasing the Martin Logan 'Odysseys' was not to audition them in my home. Nasty surprises were awaiting me after positioning them as best as I could, as follows (all frequency references are to a 1kHz tone):
* A nasty +6dB peak at the crossover frequency of 250Hz.
* A nasty dip of -4dB at 100Hz.
* A horrible +14dB peak/resonance at 50Hz that most rooms suffer from.
After many months of thinking, I decided to rearrange the room furniture a bit (which only helped to kill the peak at 250Hz) and experiment more carefully with the effects of the REL subwoofer I've had for a long time.
After excruciating efforts to place the sub properly, I have come to the following results with respect to frequency response of the entire system:
* +/- 2dB from 20Hz to 10kHz (where the meter rolls off on its own), with the exception of a peak of +4dB at 50Hz.
* The subwoofer is rolled off at 25Hz and output level set at 10 o'oclock.
* And I even get a 16Hz tone at -4dB which is very good.
Notice, this frequency response is **only** at the listening position - elsewhere things are anomalous again.
I do not have the response curve for the subwoofer, but it's obvious phase interactions between its woofer and the 4 woofers of the Logans is very interesting and very beneficial.
Tasos Kotsikonas
Ex-A.C.A. Member
Κυρ Ιουλ 05, 2009 6:52 am
