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I've got a CD that has a bunch of them at various frequencies. The test tones I'm using are pure sine waves. Sorry I haven't posted room measurements yet, I've been crazy busy the last couple of days and it's slipped my mind. Make some additional measurements with the microphone in different locations around your seating area. Your speakers have a natural low-frequency rolloff and trying to change this by too much is a recipe for overdriving amps and woofers. But this sounds like a small room problem so there's probably not a lot that can be done here. Avoid using EQ to increase the amount of bass from your speakers leave that to the subwoofer.
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If it was pure tones, than that is something different.īut even if it's not, upping the xo frequency of sub (if his sub/receiver allows it) may also be helpful. Scorpicon mentioned "coarse test tones" and "frequencies around 100Hz" - depending on what kind of tones s/he was using (especially 1/3 octave warble tones) there may be usuable output down to 80 Hz or lower, so it could be sub territory. If so, then you are correct and a second sub, or better placement, would help. I guess the only thing to do would be turn off the sub and see if the problem goes away. It is also possible that the x-over in the receiver is second order 12db/oct. That is true, I was going by his statement that the sub was barely doing anything at 100hz. The speakers are in one quadrant, but there are no doors/doorways to isolate the sound. It's shaped like a square doughnut, with a column of stairs filling the center. The basement is about 1500 sqft, with 10ft ceilings. How can I discern what is causing the issue?Īs a side note, it's not a particularly small room. He published an AES paper on it, let me see if I have it.Įdit: I was slightly off, Geddes has talked about it, but the paper was published by a couple of engineers at Harman. if your room modes are causing a cancellation, then increasing the gain at the canceled frequency is a fool's errand the more primary energy you dump into the sound field, the more cancellation energy is formed.Įarl Geddes has done some work using multiple subwoofers to improve low frequency reproduction in small rooms. I'd be willing to spend about $800 on a new receiver with an auto EQ calibration, but I would like to know:Ī) if it's even going to help my situation, andī) which auto-EQ technology is the best bang for my buck?