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Calibrating the other speakers (not just the sub)

1717 Views 2 Replies 3 Participants Last post by  gsmollin
Having had great success in the past using REW with my BFD and sub, I'm now wondering about the feasibility of using REW on the other speakers in my 5.1 set up.

My room is far from the ideal room acoustic-wise. I use the YPAO on my Yamaha receiver which helps. But I'm sure that if I had the right equalizer in front of my mains and surrounds, I could do even better.

Do I understand correctly that the BFD is not ideal for doing the mid and upper frequencies? If so, what type of reasonably priced equipment/equalizer could I add in front of my AVR to handle this. Then again, this may not even be possible because perhaps it has to be tweaked after the AVR input yet before the output. IOW perhaps I will need a different AVR?

I'd love to hear your thoughts on what is possible on a reasonable budget and whether some folks are doing this and if so, with what equipment and configuration? Thanks!
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Equalizing at high frequencies can be difficult if you are having narrow-band problems in your room, such as "comb-filter" effects, flutter echoes, or any other acoustic-reflection problems. If your YPAO is having difficulty with your room, it is unlikely any other equalization system will be much better.

You can find these issues using the REW, and using your ears too. Do a full-band sweep with the REW and look at how smooth the sweep is in the midrange frequencies. Are you seeing narrow-band dips in the response that look like the teeth of a comb? These are called comb-filtering, and they are caused by early reflections that give destructive cancellation at the microphone. You can experience them for yourself by using a single tone at 2-4 kHz, and sitting in your listening locations. Rock your head back and forth. Do you hear the apparent sound source changing postion in the room? Do you hear the sound sliding in one ear and out the other? That's comb filtering, and it's caused by reflections. You have to fix those reflections using acoustic treatments. Equalization will not help.
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