AVS Forum Special Member
Join Date: Jul 2000
Location: Chicago, IL, USA
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You might also double check your correction curve for the RS meter you have. I'm wondering if your receiver or pre-pro has a high pass in the 20Hz range that you aren't aware of. In a closed room I'd expect a less severe roll of below 20Hz, but leaks could cause this as well.
That said, the response is plenty workable. I would suggest some further experimentation with filters on the 16-35Hz range. I would look to see if you can get a smoother, more rounded resulting curve. Try stacking a couple filters. I would start by cutting about 6dB from the peak in the upper 20s trying to smooth the response into the mound in that general region. You may need to closely spaced filters set to either side of the peak with 3-4dB of cut to best match the shape.
The next question is if this measurement is through the pre-pro and internal low pass filter, or direct into the BFD? You should be measuring through the pre-pro, and you should take measurements with and without the center channel, and then check the L&R. By sending the same signal to the L & R analog inputs on the pre-pro while in a DPL (cinema) mode, the signal will go to the center channel. It looks to me like you probably have to abrupt a roll off to the top end of the subwoofer's response, but "correct" is entirely dependent on what the center channel and the L&R are doing. The >55Hz range you have cut is precisely where a significant portion of the "kick/punch" you are describing lives.
Depending on if your measurement includes the low pass of the pre-pro I would probably suggest starting with first smoothing the dominant peak, and then set one or two very wide filters in the 50-90Hz range that you can use to tilt the entire response downward slightly and lessen the roll off from 16Hz to 10Hz similar to what you have already done on your own. If the measurement shown is through the pre-pro and low pass, you want to also add a filter up around 200Hz to kill the high frequency peaking in the response.
I would leave the 40Hz null to the end. You can't do much with that via EQ. You can either put a shallow EQ in that range after everything else is shaped to pull up the energy 2-4dB, or if you find that elsewhere in the room that null turns to a big peak, put a very narrow notch centered right on that frequency.
Seaton Sound, Inc.
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