I am an ignorant newcomer to room EQ. A while back, I bought a measurement mic, took pink noise measurements in REW, created filters, and loaded them into Roon. It helped clean up the bass and improved the sound, if not dramatically, of a system that already sounds pretty good to me. I kept the filters in place for several weeks and enjoyed them.
Then, a few days ago, I was playing the third movement of the Koussevitzky bass concerto, as one does. (Sztankov/Budapest Symphony). At about 1:30 into the track, I experienced some an odd and unexpected resonance in my Joseph Audio RM20 speaker, the left one. It was very noticeable and caused me to think it could not be good for the speaker. I have never had this resonance previously. I scaled back the filter, and the problem went away.
However, here is the mystery. I figured out that the offensive note was the E below middle C, or about 165 Hz. When I look at the unfiltered frequency response for that speaker, I figured I would see a dip there. My theory was that the filter was overcorrecting at a resonance frequency for the cabinet, causing the problem. But there was no dip. Do the learned readers of this post have an alternative theory? I am also curious whether commercial correction software, like Audiolense, could be expected to evade the same problem.
Then, a few days ago, I was playing the third movement of the Koussevitzky bass concerto, as one does. (Sztankov/Budapest Symphony). At about 1:30 into the track, I experienced some an odd and unexpected resonance in my Joseph Audio RM20 speaker, the left one. It was very noticeable and caused me to think it could not be good for the speaker. I have never had this resonance previously. I scaled back the filter, and the problem went away.
However, here is the mystery. I figured out that the offensive note was the E below middle C, or about 165 Hz. When I look at the unfiltered frequency response for that speaker, I figured I would see a dip there. My theory was that the filter was overcorrecting at a resonance frequency for the cabinet, causing the problem. But there was no dip. Do the learned readers of this post have an alternative theory? I am also curious whether commercial correction software, like Audiolense, could be expected to evade the same problem.
