Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Details on the room ...

203.85.226.1

Posted by PW on April 28, 2003 at 21:49:54

In Reply to: Re: Behringer Ultracurve 8024 veterans please help ... too much bass ... posted by Kuei Yang Wang on April 28, 2003 at 17:56:20:

Hi,

Thank a lot for the reply.

Without any test signal, the mic (mic gain setting on AUTO) constantly picks up something like this (even late at night):

25Hz-80Hz: -85dB (when a car drove by) to -105dB
100Hz-1KHz: -120dB to -130dB
1KHz-20KHz : -130dB to -140dB

So there is surely some random low freq noise around.

>> All my Para EQs are used to attenuating the low freq at 29,
>> 40 and 60 Hz,
>How did you arrive at these frequencies?

Only by trial and error. I did a room mode calculation, the room mode are 35, 61 and 71Hz.

>They seem not particulary related to any room mode I'd expect. I'd probably expect 36 & 72 + 75Hz as the biggest offenders, strictly based on room dimensions given.

Why 75Hz?

>MAX SETTING? The worst rooms I have seen do not need much more than 18 - 24db EQ.

1. Could that be the constant but random low freq noise (but only at -85dB level) affects the Auto-Q function?

2. Could that be the small rooms acted as resonance chambers (just a guess)?

>Run sensible EQ settings. The more you attenuate in the parametric EQ's the more >processing power.

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?

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?

So this is the details of my room. All walls are concrete walls. I also indicated the room mode of each of the rooms.

You are always so helpful, thanks a lot for your help.

This post is made possible by the generous support of people like you and our sponsors:

Schiit Audio

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