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I've recently moved to a new home and finally have a dedicated listening room to put my system in. The room measures 13'6" x 12' with 8' ceilings. I started with speaker placement along the shorter wall and according to Audio Physics setup. I tweaked from there as I took measurements using Stereophile's Test CD 3 (tracks 17-19) and a RadioShack analog level meter. The speakers were very well behaved for the most part, within +/-3dB across the majority of the range. I used 70dB @ 1kHz as a reference point. On track 17 however, the bass region, there was a significant drop in the mid-upper bass. It dropped almost 10dB from Index 3-4 and then spiked from Index 4-6 on that track. I don't have the exact frequencies with me but I believe it was around 125Hz-70Hz.Is there anyway to level out this significant dip/spike? Should I start with the speaker placement or listening chair placement? Would any kind of room treatment work without significantly impacting other frequencies?
Thanks in advance,
Bill
The general rule is to position the speakers at approximately 1/4 wavelength distance from the nearest solid surface to attenuate peaks, and position at approximately 1/2 wavelength to accenuate dips.Obviously this is not a trivial task, but if you can find a position that has a generally flat response with possibly a peak or two you can attenuate these with some sort of a parametric equalizer.
Regards,
Davey.
Could be room modes, and bass traps would help with that.See:
the original post where I reveal the latest Quick & Dirty super easy bass traps recipe:
http://www.audioasylum.com/audio/tweaks/messages/15737.html
and petew's post where he goes into detail on what he did.
http://www.AudioAsylum.com/audio/general/messages/70817.html
for a post on how to make SUper QUick & Dirty bass traps inexpensively and easily.For more general DIY room treatment options, see:
http://www.geocities.com/jonrisch/a.htm
Jon Risch
Jon,These wouldn't make things worse? At it's highest peak (after the 10dB drop) it was only 75dB (+5 from reference of 70). I realize I'd probably have to sacrifice some of that lower-bass energy in order to get the mid-upper bass up but wouldn't bass traps absorb too much?
Thanks,
Bill
Not really, the traps, being in the corner, will tend to damp the room modes more than absorgb ALL bass the same.They actually reduce the peaks and dips due to these room modes much more than they will reduce total bass.
Jon Risch
Jon,
Thanks for the help, one more question. Where should I start with the bass traps? Do I use two in the front corners (behind the speakers) or do I use on in each corner? I really only have 3 right-angle corners The other is cut off at a 45 deg angle.Thanks again,
Bill
Sounds like you answered your own question.If the cut-off corner is in the rear,then put two in each front corner, if not, then place one in each corner, and the odd 4th unit is as far as it will go into "the corner".
Jon Risch
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