What is the calibration tone frequency used by the AVR - AVS Forum
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post #1 of 8 Old 02-26-2014, 03:13 PM - Thread Starter
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I have a 3 db difference between my REW mic/SPL meter (with sensitivity data added to the cal file) and the rat shack meter when trying to set the proper speaker sound level.

I'm wondering if the rat shack needs correction applied. ?

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post #2 of 8 Old 02-26-2014, 03:18 PM
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Quote:
Originally Posted by pdxrealtor View Post

I have a 3 db difference between my REW mic/SPL meter (with sensitivity data added to the cal file) and the rat shack meter when trying to set the proper speaker sound level.

I'm wondering if the rat shack needs correction applied. ?

Google on Radio Shack SPL meter calibration

However, the sensitivity of the mics used in cheap SPL meters and low cost measurement-type mics is well known to be inaccurate and change based on weather, temperature, etc.

If you pay the big bucks (e.g $600+ for the mic it might be reasonable to expect something better)
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post #3 of 8 Old 02-26-2014, 03:19 PM - Thread Starter
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Quote:
Originally Posted by arnyk View Post

Google on Radio Shack SPL meter calibration

However, the sensitivity of the mics used in cheap SPL meters and low cost measurement-type mics is well known to be inaccurate and change based on weather, temperature, etc.

If you pay the big bucks (e.g $600+ for the mic it might be reasonable to expect something better)

Yes, I did Google and that's when I realized I have no idea what frequency the AVR is putting out when setting the speakers to 75db.

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post #4 of 8 Old 02-26-2014, 03:45 PM
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Quote:
Originally Posted by pdxrealtor View Post

Quote:
Originally Posted by arnyk View Post

Google on Radio Shack SPL meter calibration

However, the sensitivity of the mics used in cheap SPL meters and low cost measurement-type mics is well known to be inaccurate and change based on weather, temperature, etc.

If you pay the big bucks (e.g $600+ for the mic it might be reasonable to expect something better)

Yes, I did Google and that's when I realized I have no idea what frequency the AVR is putting out when setting the speakers to 75db.

If your AVR is calibrated by Audyssey, it uses a chirp or sweep. so the full audio band is involved.
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post #5 of 8 Old 02-26-2014, 03:46 PM - Thread Starter
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So which one would you use to double check the job the receiver did at setting levels?

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post #6 of 8 Old 02-26-2014, 03:47 PM - Thread Starter
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It's Pioneer MCACC, and for channel level it uses a 'noise' tone. THat's why I'm having the issue with the correction file.

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post #7 of 8 Old 02-26-2014, 05:13 PM - Thread Starter
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Arny? Anyone??

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post #8 of 8 Old 02-27-2014, 01:18 PM
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Quote:
Originally Posted by pdxrealtor View Post

Arny? Anyone??


Test tones are typically "White Noise" meaning that all audible frequencies are input simultaneously and at the same amplitude.  If the two mics differ by 3 db, that is a relative difference, an offset. As long as the difference remains 3 db on all channels, the system would be properly balanced, yes?

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