How to use my new SPL meter correctly ? - AVS Forum
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post #1 of 8 Old 09-25-2012, 08:47 AM - Thread Starter
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So i just bought a new SPL meter to calibrate my 5.1 setup correctly.

Slow Response and Weightning to c.

I know that i need to calibrate all my speakers so that the SPL meter show 75dB , so i hear reference volume , but at what should i set my receiver volume ? My receiver is not THX , so the volume is only from 0 up to 70.

At 0 i hear nothing , i normally listen at 40-45 volume.

Also , should i calibrate my rear speakers to the same af fronts (75dB) , or can i set them a little higher ? Because i like sounds coming from the rear speakers.

Listening position is 3,0meters from center , and fronts , 1.8m from rears and 3.3m from subwoofer.
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post #2 of 8 Old 09-25-2012, 08:54 AM
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If your receiver isn't THX certified and IF the test tone changes volume as you change the volume on the AVR (my older AVR was like this too), then honestly just pick a volume and measure all the speakers at the listening position get them all to the same level then tweak from there. So maybe since you listen at 40 to 45 maybe try 50 or 60 and see if that produces a test tone close to 75db at the LP. When you have a THX receiver the Test tone is always the same level no matter what the volume is at so it makes calibration so much easier.

Also just cuz you get all the speakers to the same SPL doesn't mean you have to leave it like that. Most ppl run their subs hot. I run my subs 2db hot and I also run my center 2db hot.

Shawn
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post #3 of 8 Old 09-25-2012, 10:38 AM
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Quote:
Originally Posted by flickhtguru View Post

If your receiver isn't THX certified and IF the test tone changes volume as you change the volume on the AVR (my older AVR was like this too), then honestly just pick a volume and measure all the speakers at the listening position get them all to the same level then tweak from there. So maybe since you listen at 40 to 45 maybe try 50 or 60 and see if that produces a test tone close to 75db at the LP. When you have a THX receiver the Test tone is always the same level no matter what the volume is at so it makes calibration so much easier.
You can use the (free) THX Optimizer program included on any disc with the THX logo on it. Look through the disc menus, you'll find it. Follow the on-screen directions, the cal noise is meant to play at reference.
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Originally Posted by flickhtguru View Post

Also just cuz you get all the speakers to the same SPL doesn't mean you have to leave it like that. Most ppl run their subs hot. I run my subs 2db hot and I also run my center 2db hot.
But start with them calibrated correctly first. I wouldn't say "most people", it depends on their gear and room. I rarely set up a room with hot subs and center, but it does happen.
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post #4 of 8 Old 09-25-2012, 11:06 AM - Thread Starter
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Quote:
Originally Posted by has7738 View Post

You can use the (free) THX Optimizer program included on any disc with the THX logo on it. Look through the disc menus, you'll find it. Follow the on-screen directions, the cal noise is meant to play at reference.
But start with them calibrated correctly first. I wouldn't say "most people", it depends on their gear and room. I rarely set up a room with hot subs and center, but it does happen.
I think its a must running my center speaker hot. Sometimes i find it a problem to hear the dialogue and words without subtitles. Its mounted on a 65inch plasma and my speaker system is the jamo s608 .
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post #5 of 8 Old 09-25-2012, 11:45 AM
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I don't know the speaker, but dialog intelligibility is a HUGE problem, and a large part of it lies in production. Running the center hot may help. Some of the problem is also in the speaker itself and even more a factor is the acoustic environment. I don 't know your speaker, can't say anything about it specifically. Often you can help dialog with auto cal systems like Audyssey, which has as one of its goals dialog improvement. If you don't have it on your AVR, look for it next time you upgrade. It's not a sub for fixing bad room acoustics, but it does help a lot.

Bad room acoustics, in general, are very "echo-y", to use a bad colloquialism. Hardwood floors are again popular, but don't help dialog. I'm seeing rooms now where all surface in the room are acoustically reflective, with so little absorption in the room that the audio is a swimmy mess. Don't know what you have, but when I get a dialog complaint it's nearly always because of the acoustics. But like I said at first, it's a production issue too, so even with perfect acoustics dialog can be challenging.
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post #6 of 8 Old 10-02-2012, 08:46 PM
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sorry to hi-jack threat for, where do i find the calibration disk?
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post #7 of 8 Old 10-03-2012, 12:56 AM
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Any disc, like movies, that have the THX logo on them also have the THX Optimizer program, usually in the 'extras' somewhere, or perhaps the 'setup' menu.
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post #8 of 8 Old 10-03-2012, 07:37 PM
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THX certified release list, most with THX Optimizer.


http://www.thx.com/consumer/home-entertainment/thx-certified-releases/
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