Quote:
Originally Posted by Lupo  Hi!
Came to think about this.
Comb filtering results in equal amounts of added pressure and removed pressure. If there's a sharp dip, there's also a sharp peak somewhere. The peak can be EQ'ed. Since SBIR doesn't move with listening position, this seems like a good place to use an EQ if that's so desired. Perhaps that's what SAC wrote above and I'm too dense to realize it. :D
Been thinking about this room EQ thing. What about the impulse response? Surely adding an EQ to correct non-minimum phase behaviour will make the impulse response worse..? Is this a problem in real life? |
What SAC is saying is that you put a loudspeaker near a wall you get an enhanced bass response due to 'SBIR'. If you adjust the output of the loudspeaker by EQ you can compensate for the enhanced bass response at the source, cutting the bass output of the loudspeaker. I.e. the net result is flat in the frequency response. I think it means that you and your loudspeakers are all in the 'peak' of that room mode, close to the wall(s). All the EQ is doing is reducing the amplitude of the 'peak' by driving it less, you're cutting the frequency that drives that room mode. Take the wall away, or move the loudspeaker away, and you need to take the cut out of the EQ to get a flat response again.
What do you mean by make the impulse response worse? Impulse and frequency response are two ends of the same thing. FFT your impulse response and you get the frequency response.