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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Real Time Analysis posted by throwback on June 13, 2012 at 14:25:11:
Not to throw cold water on your idea, but noise-based RTA requires huge amounts of time to integrate the detected signal in order to be accurate.
The swept-filter based designs have, at best,marginal accuracy below 100hz.
I designed and built an audio analyzer in 1981 (a fixed filter type), participated in the design of another audio unit in 1985 (a swept filter type), and a re-design of another swept-filter type analyzer in 1998 (for vibration analysis down to 5hz and up to 22G).
I personally use the one from the 1985 project, but I realize the shortcomings of its design and how to interpret what it tells me.
The other major problem is that EQ cannot 'fix' a response problem in the time domain. It may measure flat, but it won't sound right.
I recommend treating the room first, then applying EQ. Note the amount of EQ to make it measure flat, them reduce the amount of EQ in each band by about half. IE: If you need a narrow notch at 71hz (8' ceiling) that requires an 8dB cut, try reducing the cut to 4dB. I always use tuned and damped 1/4W absorbers first (made out of a $6 piece of 8"x48" Sonotube and damped with fiberfill), and only then do I use a parametric EQ.
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Follow Ups
- Cold Water - djk 01:31:25 06/15/12 (0)
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