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#43773 - 01/11/03 02:47 PM Calibrating Subwoofer. Internal test tones vs Avia
jgubman Offline
Gunslinger

Registered: 12/24/02
Posts: 49
Loc: San Mateo, CA
Ok, got my blue dot 950 all hooked up (thanks Outlaw, great job w/ the new rev). And now that my noise issues are for the most part resolved, I set to calibrating the trims.

I set all 8 channels to 75db SPL at 0 volume (had to trim them between -11 and -8 this time, last version was btwn -8 and -5).

Then I set my 950 to Dolby Digital mode and threw in Avia.

The subwoofer calibration tests on Avia (chapter 7, alternating high-frequency and low-frequency pink noise on all 5 channels) had me raise the trim on my subwoofer. I went back to the internal test tones and at the trim Avia had me calibrate to, the subwoofer was 6 to 8 dbs higher than the other channels.

Is there any explaination for this? Is Avia measuring LFE and the internal tones measuring subwoofer or something?

Who should I believe?

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#43774 - 01/11/03 03:02 PM Re: Calibrating Subwoofer. Internal test tones vs Avia
soundhound Offline
Desperado

Registered: 04/10/02
Posts: 1857
Loc: Gusev Crater, Mars
I'm almost positive that the Avia disc is intended to use _85db_ instead of 75db as a reference on your sound level meter. Check in the instructions in the booklet and on the on-screen instructions, they will probably say 85db. Just cal until those tones are at 85db rather than 75db and it should all come out right. (assuming I'm right )

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#43775 - 01/11/03 03:04 PM Re: Calibrating Subwoofer. Internal test tones vs Avia
soundhound Offline
Desperado

Registered: 04/10/02
Posts: 1857
Loc: Gusev Crater, Mars
I'm almost positive that the Avia disc is intended to use _85db_ instead of 75db as a reference on your sound level meter. Check in the instructions in the booklet and on the on-screen instructions, they will probably say 85db. Just cal until those tones are at 85db rather than 75db and it should all come out right. (assuming I'm right )

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#43776 - 01/11/03 03:11 PM Re: Calibrating Subwoofer. Internal test tones vs Avia
jgubman Offline
Gunslinger

Registered: 12/24/02
Posts: 49
Loc: San Mateo, CA
Yep, you're right soundhound. The on-screen instructions in Avia just said to calibrate to a level higher than 70, so I was just going by 75.

I re-calibrated Avia at 85db SPL and the trims matched the internal test tone's 75db SPL levels.

Thanks again!

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