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Bob Richards 29th April 2011 11:06 PM

Room Acoustics and Lower Midrange Suckouts
Typical speakers in a typical listening room often have major dips in the acoustic frequency response at the listening position. IMO, it's those lower midrange cancellations and/or resonances that make it a bummer to turn up the bass control (thereby giving tone controls a bad name). The question is what to do about them. You can't pull up a cancellation with electronic EQ without creating peaks elsewhere in the room, and risking driver overdrive. Anything that involves resonance could be damped some how. I don't have room for any kind of Helmhotz resonator. The guys in another Forum were suggesting "Flanking drivers" perhaps only in the problem frequency range (-3dB covering 100 Hz to 300Hz, for example). They were to be physically displaced from the regular front firing drivers, so would have cancellations due to room acoustics, at different frequencies, so the two could fill in, to some extent, each others cancellation frequencies. Higher frequencies act primarily like vectors, but the lower mid and bass is apparently better analyzed some other way. It would be interesting to hear if others have had luck fixing the lower midrange problems in their listening room.

Calvin 30th April 2011 08:26 AM


the suckout quite often relates to reflecting boundaries like the floor and the ceiling. If a bass or low-midrange signal is reflected by the boundary the suckout at the listening position happens around 60Hz and multiples of this frequencies.


markusA 30th April 2011 09:57 AM

Have you tried measuring the room acoustics? That's a good place to start. It's takes some of the guessing out of the equation.

I'm gearing up to build myself some mic's...

DSP_Geek 30th April 2011 04:10 PM

Flanking drivers are exactly the wrong thing since they'll throw more energy into the room and mess up the indirect sound, which you will hear as confused lower midrange.

Suckouts in that range are typically caused by a reflection on the floor between you and the speaker interfering with the direct wavefront. Results with rugs are mixed (thicker is better, so is felt padding), but that would be a good place to start.

Zeptepi 24th July 2011 08:32 PM

You can try to move your speakers.
For finding a right position :
Put one of your speaker at the place where you usualy listen (yes on the couch if it's the place). Turn off the other speaker and put some music.
Go to the place where your speaker was. Listen.
Move a little. Listen.
When you find the place where the sound is the best, mark it, and replace your speaker at this place.
But it will not help if the acoustics of your room is too bad.

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