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Re: Channels, channels, and more channels!

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umpybill

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In Reply to: Re: Channels, channels, and more channels! posted by Rich Brkich on November 03, 2003 at 07:52:18:

Rich,
You bring up an interesting point about room treatments. One of the topics I have been exploring lately is (gasp!) equalization. The classic "audiophile" approach to room-dependant frequency response errors, once the appropriate speakers have been discovered, is to fiddle with speaker placement, cables, and maybe acoustic treatments such as RPGs and ASCs. This is usually done by trial and error. I'm convinced that some people's favorite speaker is chosen by his room and not his ear. A more scientific method would be do do some digital EQ using an RTA in conjunction with a house curve target response. Any thoughts?

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Re: Channels, channels, and more channels! - Rich Brkich 19:42:20 11/03/03 (0)
Digital EQ is no panacea. Some examples:
1) A speaker with a few db peak somewhere in the midband caused by a driver cone resonance. Digital EQ can help reduce the magnitude of this peak, but the resonance is still there, but less obvious. I tend to think a better designed driver without that resonance peak that does not need digital EQ to correct it would sound better.
2)Direct vs. reflected sound. If we are EQing to correct for room response anomalies and you have a stereo set-up with one speaker that has a higher ratio of reflected to direct sound than the other (as heard at the listening position), digital EQ cannot correct for that imbalance in the ratios. Only room treatment can affect that ratio.
3) Bass EQ. This is one area where digital EQ can do very good things, but if the correction asked for by the EQ is too gross, driver excursion can be pushed past linear limits.
You are right though, speaker selection has much to do with the with the room and digital EQ would be a good tool to use to adress certain broad response issues. EQ is always best when used judicously.
Rich Brkich

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