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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: Details on the room ... posted by PW on April 28, 2003 at 21:49:54:
Koinichiwa,> 25Hz-80Hz: -85dB (when a car drove by) to -105dB
> 100Hz-1KHz: -120dB to -130dB
> 1KHz-20KHz : -130dB to -140dBSounds reasonable.
> Only by trial and error.
Trial & Error how? By ear? Using test tones?
> I did a room mode calculation, the room mode are 35, 61 and 71Hz.
These are the main modes.
> Why 75Hz?
According to the dimensions you gave and I worked from there seem to be multiple modes all centered around 70 to 75Hz.
> 1. Could that be the constant but random low freq noise
Doubtful. It's low enough that when Auto Q works at all it is omited.
> 2. Could that be the small rooms acted as resonance chambers
It will do so, but not at the kind of degrees you seem to have.
> 3. When you recommended not more than 6dB correction should be
> used, does this 6 dB include the amount which is set in the Para
> EQ? For example, if I attenuate -4dB in the Para EQ at 31.5Hz,
> than I attenuate another -5dB at 31.5Hz in the main EQ, this
> (-9dB in total) will bring it outside of your recommendation
> of 6dB, correct?I recommend no more than 6db BOOST. Attenuation much greater than 6db on graphic EQ is not recommended as it suggests a problem elsewhere, but does cause any problems I am aware of.
> 4. Inside the RTA Setup manual, there is a setting called
> “Level†at the right bottom concern, this is currently set
> for -12dB, will this be sufficient?No idea. This is a simple relative setting and depends upon the rest of the system.
Also, a little "curve wriggle" is normal at very low frequencies even with 1s holdtime and pink noise.
Sayonara
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Follow Ups
- Re: Details on the room ... - Kuei Yang Wang 06:06:04 04/29/03 (0)
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