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RE: digital roomcorrection

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In Reply to: RE: digital roomcorrection posted by josh358 on January 20, 2011 at 08:37:06

that is why i like very narrow cuts for room correction. test tones help you find the exact frequency of the problem modes, but music is not test tones. even a bass note played by a musical instrument with the exact same fundamental frequency will sound much closer to "normal" with only that narrow cut.

Follow Ups:

RE: digital roomcorrection - josh358 07:39:24 01/21/11 (10)
I don't know about you, but I've always found that moderately broad equalization can do more violence to the sound than no equalization at all. Newer research says that we're much more sensitive to low Q than high Q resonances -- the opposite of what I would have thought -- and I suspect that that's the reason. It seems that equalization has to have a 1/12 octave resolution to be effective.
- RE: digital roomcorrection - hemholtz 09:05:52 01/21/11 (9)
  1/12 octave is the narrowest choice in the deqx parametric eq. that's exactly what i meant by narrow.
  - RE: digital roomcorrection - josh358 11:45:32 01/21/11 (8)
    Do they also give you manual control over group delay?
    - RE: digital roomcorrection - hemholtz 12:06:30 01/21/11 (7)
      if you mean by channel, then yes. you can apply a delay to each channel on the crossover independently. you can't pick a group of frequencies to delay though. i'm not sure why you would want to do that since it does a good job automatically from the speaker measurements.
      - RE: digital roomcorrection - josh358 15:50:28 01/21/11 (6)
        
        In Reply to: RE: digital roomcorrection posted by hemholtz on January 21, 2011 at 12:06:30
        
        Well, comb filtering isn't minimum phase, so I was thinking that the room corrections could leave you with group delay.
        
        RE: digital roomcorrection - hemholtz 17:32:08 01/21/11 (5)
        
        In Reply to: RE: digital roomcorrection posted by josh358 on January 21, 2011 at 15:50:28
        
        the comb filtering i'm talking about is at higher frequencies not effected by room dimensions but by early reflections. room correction are at lower frequencies. the time between + and - is greater at these frequencies. there are much bigger problems reproducing these frequencies than group delay.
        
        RE: digital roomcorrection - josh358 18:01:16 01/21/11 (4)
        
        In Reply to: RE: digital roomcorrection posted by hemholtz on January 21, 2011 at 17:32:08
        
        That's true. At those frequencies, you're lucky if you can just get something that's reasonably flat.
        
        RE: digital roomcorrection - hemholtz 06:27:37 01/22/11 (3)
        
        In Reply to: RE: digital roomcorrection posted by josh358 on January 21, 2011 at 18:01:16
        
        decay of modal frequencies is what muddies it all up. a little bump in frequency response isn't all that bad, but slow decay of that bump sounds terrible. it covers up important harmonics and makes the bass line sound monotone. the best thing to do is a 1/12 octave 6db or better cut centered on the modal frequency. you will still hear the modal frequency but the decay will be 10db down right away and will usually drop off much quicker after that too.
        
        RE: digital room correction - josh358 05:53:00 01/23/11 (2)
        
        In Reply to: RE: digital roomcorrection posted by hemholtz on January 22, 2011 at 06:27:37
        
        Not to mention that you get pitch shift, a truly bizarre phenomenon. But I'm curious -- are you talking about adjusting the equalizer so that the time-integrated 1/12 octave frequency response is flat, or are you talking about pushing the band down even further because the time smear of the resonance is sonically worse than the resulting frequency response dip?
        
        RE: digital room correction - hemholtz 08:47:39 01/23/11 (1)
        
        In Reply to: RE: digital room correction posted by josh358 on January 23, 2011 at 05:53:00
        
        sometimes a 10 db cut only makes a 3db difference on stacked modes. i wouldn't call it a smear, just slow in room decay.
        
        it's mostly just trial and error. measure, adjust, remeasure, listen to results. i just put the deqx eq window next to the etf5 low frequency measurement window and click away. once the measurement mic is set up and the software configured, it usually doesn't take more than an hour for really good results.
        
        RE: digital room correction - josh358 10:34:01 01/23/11 (0)
        
        In Reply to: RE: digital room correction posted by hemholtz on January 23, 2011 at 08:47:39
        
        You're giving me a bad case of DEQX envy. Though I'd still like to do this in software if possible, since I can't afford to use DEQX for surround.

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