I am toying with the idea of equalizing the complete acoustic part of a system using the principle of reciprocity:
In principle, to determine the equalization curve, one would just need to send white or pink noise through one channel of a stereo system, and use the speaker of the other channel as a microphone/sensor.
The response curve of one channel would then be the square root of the measured response through the whole system.
The equalization could be tested/verified dynamically: if the response of the complete, equalized system is flat, this means that the response of each channel is also flat (or complementary, but that's unlikely).
I imagine that things are not that simple, and that others have already had a similar idea, so what is (are) the snag(s)?
In principle, to determine the equalization curve, one would just need to send white or pink noise through one channel of a stereo system, and use the speaker of the other channel as a microphone/sensor.
The response curve of one channel would then be the square root of the measured response through the whole system.
The equalization could be tested/verified dynamically: if the response of the complete, equalized system is flat, this means that the response of each channel is also flat (or complementary, but that's unlikely).
I imagine that things are not that simple, and that others have already had a similar idea, so what is (are) the snag(s)?
Interesting idea. The transfer function to each point in the listening room will be different, how do you handle that with your system?
I do not handle it, mostly because I do not see a simple way of taking it into account.
As I see it, the system would be not be perfect, but it would be extraordinarily simple, easy and fast: for example, with a DSP module included in the amp.
You would just have to press the "Equalize" button to get your installation calibrated in less than a minute, without microphone, test instruments, calculations or moving anything inside your listening space.
The tradeoff is a slightly imperfect equalization, but anyway very much better than no equalization at all.
If the arrangement of the room is half-sensible, the listening position will be symetrical wrt. to the speakers, not too far away, and if the speakers do not have a gross directivity problem, the end result could be pretty good
As I see it, the system would be not be perfect, but it would be extraordinarily simple, easy and fast: for example, with a DSP module included in the amp.
You would just have to press the "Equalize" button to get your installation calibrated in less than a minute, without microphone, test instruments, calculations or moving anything inside your listening space.
The tradeoff is a slightly imperfect equalization, but anyway very much better than no equalization at all.
If the arrangement of the room is half-sensible, the listening position will be symetrical wrt. to the speakers, not too far away, and if the speakers do not have a gross directivity problem, the end result could be pretty good
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