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Critic's Corner Discuss a review. Provide constructive feedback. Talk to the industry. |
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In Reply to: Perception of Sound posted by Inmate51 on September 29, 2017 at 21:12:29:
You CAN'T fix a room's sound with EQ. EQ can only change what's put into it.
You CAN'T fix a speaker's ringing or decay characteristics with EQ.
Yes you can, to some degree anyway.
Perhaps you're only considering traditional EQ filters which modify the amplitude and/or phase of the frequency response according to some transfer function that you've set the parameters of.
A simple example: suppose you measure the impulse response of your room at the listening position, and you notice strong early reflections popping well out of the noise at 15ms and 25ms. So you use a DSP to implement a convolution filter whose kernel is the inverse of these two reflections. During playback, the inverse correction signal comes out of the drivers and arrives at the listening position at the same time as the reflections, cancelling them. This actually works, although it takes a little tweaking to get the timing just right. The catch is that it only works at one location. At other locations in the room, the reflection and it's correction aren't time coincident, so the correction is like adding another pseudo-reflection into the room response everywhere else.
A different example, probably more like what you're thinking, is if you measure the amplitude response of the loudspeaker + room, and then equalize it flat using a set of parametric EQ filters. This type of correction kind of works in the bass, though I still much prefer bass traps and careful placement. But in my experience it doesn't work at higher frequencies, harming the direct sound more than it helps the reverberant sound. But lots of people try it because it's easy, and a lot of people like it because it makes pretty graphs.
Regarding the loudspeaker alone, I don't see why you couldn't implement a convolution filter whose kernel is the inverse of the loudspeaker's unwanted decay tail. I've never tried it though. And I think you'd need an anechoic chamber to do a decent job of it.
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Follow Ups
- RE: Perception of Sound - Dave_K 10/1/1713:43:01 10/1/17 (2)
- RE: Perception of Sound - Inmate51 15:29:52 10/1/17 (1)
- RE: Perception of Sound - Inmate51 11:55:28 10/13/17 (0)
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