Originally Posted by cel4145
Q is a term that describes the shape of a frequency response curve. The bandwidth setting on a PEQ is a Q control. My Dayton Audio SA1000 has a single PEQ function. My Sansa Clip+ has a PEQ now that it's been rockboxed; I can adjust the Q on it and set the frequency point and gain for five different frequencies. The "bandwidth" setting for the PEQ on the Rythmik subs is Q control, even though it's not labeled as such. When you build a sealed subwoofer, you can change the Q by changing the box size--it changes the shape of the response curve. Putting damping material in a sub can change the Q. So Q can certainly be adjusted in more ways than one for subwoofer output.
I'm sorry to disagree, but I believe Q describes more than mere response curve. In my reading, "Q" is the term used by speaker designers and engineers to describe how well damped a driver is
. Go to that link, scroll down to "Mass and Compliance" and read through "Damping & Q". Low frequency response curve is just a consequence of Q, and Q is just a measurement of damping. You are talking about equalizing with PEQs, which, in my extremely limited understanding, is a different thing, it is just some electronic filters. Read that link, and if you are still not convinced, maybe we should ask one of the speaker designers that post here like Dennis Murphy, or maybe Dr. Hsu himself. Anyway, I am no expert, I could be wrong, and if I am, I look forward to being corrected. Anyway, I think the way Hsu is using a Q control and Rythmik is with their damping switch is more than just a filter.