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

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218.186.11.1

Posted by WBWB on March 18, 2007 at 02:47:26

In Reply to: Re: Is a dip a room null? Paging Kenster, will ASC help? posted by David Aiken on March 17, 2007 at 23:13:05:

Hi David,
Appreciate your very detailed reply.

I am using the JBL Room Mode Correction (RMC) unit which comes with a test disc and a SPL meter. The SPL meter is mounted on a tripod at ear height at where I sit for listening. The test tone starts at 126 Hz and goes down to 20 Hz.

Sorry about incomplete data earlier, the detailed measurement between 76 and 35dB are as below:
85Hz = +1.5dB*
76Hz = -3dB
68Hz = -7dB
62Hz = -8dB
57Hz = -9dB
53Hz = -10dB
50Hz = -11dB
47Hz = -11dB
45Hz = -10dB
41Hz = -9dB
35Hz = -3dB
31Hz = +2dB*
(*Just for a more complete picture)

Is my objective correct to raise this band between 41 to 76Hz to less than -3dB, since my speakers dip at 40Hz? And I was wondering what frequency tubetraps will raise this null. Does it mean I have to get a tubetrap that is effective down to 40Hz?

Thank you once again!

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