This is mostly for Amir because I know he's up on this topic, but I'm glad to hear from anyone else who has graphs or (better) an REW data file and is willing to share. I'm writing an article about bass problems and solutions in home-size rooms, and I want to be as fair and accurate as possible. So toward that end:
1) I'm looking for proof that using multiple subwoofers can reduce modal ringing. I've heard proponents claims you can place a sub "where it won't excite room modes," but that makes no sense to me. I've asked several multi-sub proponents for Before/After waterfalls, but they never had any actual proof of this claim.
2) Likewise, I'm looking for proof that subwoofer EQ can reduce modal ringing more than a tiny amount.
My only requirement for graphs is that the Before and After measurements must have been made with identical microphone placements. If the mic moves even an inch or two between sweeps, that alone will create differences large enough to invalidate the data. As an example of what I'm looking for, the attached graphs show the response in a largish room with and with the Dirac room EQ system engaged. The mic was not moved between measurements.
Thanks!
1) I'm looking for proof that using multiple subwoofers can reduce modal ringing. I've heard proponents claims you can place a sub "where it won't excite room modes," but that makes no sense to me. I've asked several multi-sub proponents for Before/After waterfalls, but they never had any actual proof of this claim.
2) Likewise, I'm looking for proof that subwoofer EQ can reduce modal ringing more than a tiny amount.
My only requirement for graphs is that the Before and After measurements must have been made with identical microphone placements. If the mic moves even an inch or two between sweeps, that alone will create differences large enough to invalidate the data. As an example of what I'm looking for, the attached graphs show the response in a largish room with and with the Dirac room EQ system engaged. The mic was not moved between measurements.
Thanks!