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Radio shack SPL meter - correction table
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Old 29th June 2008   #1
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Radio shack SPL meter - correction table
Last night I read up on the RS Digital SPL meter and it's issues. surprise surprise, for 50 bucks, it does not measure uniformly across the entire spectrum. Many folks have done some comparisons btw the RS model and calibrated lab equipment and have come up with a correction table (below). They tested many units and found that this issue is relativly uniform for the entire line and it has to do with the the electronics inside the unit, not the mic. This does not replace an RTA and a professional but I thought this was pretty interesting..
There are several sources of info on this subject.. here is one of them http://www.audioxpress.com/magsdirx/...a/koya2811.pdf You can google radio shack spl meter correction to find more..

Radio shack digital SPL meter

Frequency - Meter Read - Correction - True spl

20 - 85 - 7.5 - 92.5
25 - 85 - 5.0 - 90.0
31 - 85 - 3.0 - 88.0
40 - 85 - 2.5 - 87.5
50 - 85 - 1.5 - 86.5
63 - 85 - 1.5 - 86.5
80 - 85 - 1.5 - 86.5
100 - 85 - 2.0 - 87.0
125 - 85 - 0.5 - 85.5
160 - 85 - (-0.5) - 84.5
200 - 85 - (-0.5) - 84.5
250 - 85 - 0.5 - 85.5
315 - 85 - (-0.5) - 84.5
400 - 85 - 0.0 - 85.0
500 - 85 - (-0.5) - 84.5
630 - 85 - 0.0 - 85.0
800 - 85 - 0.0 - 85.0
1k - 85 - 0.0 - 85.0
1.25k - 85 - 0.0 - 85.0
1.6k - 85 - (-0.5) - 84.5
2k - 85 - (-1.5) - 83.5
2.5k - 85 - (-1.5) - 83.5
3.15k - 85 - (-1.5) - 83.5
4k - 85 - (-2.0) - 83.0
5k - 85 - (-2.0) - 83.0
6.3k - 85 - (-2.0) - 83.0
8k - 85 - (-2.0) - 83.0
10k - 85 - (-1.0) - 84.0
12.5k - 85 - 0.5 - 85.5
16k - 85 - 0.0 - 85.0
20k - 85 - 1.0 - 86.0
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Old 29th June 2008   #2
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Thanks, good to know. I suppose that it's still very accurate when measuring broadband?
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Old 29th June 2008   #3
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does this also include the analog version?
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Old 29th June 2008   #4
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All versions are screwy.. the newer models are worse, the digital model is the worst of the worst.. check out the graph on the PDF. The lightest line represents the digital meter. All of them have a bump in the 2 - 6 k range and varying ranges of LF response.

The good new.. the digital meter is +/- 2db accurate over all.
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Old 5th April 2013   #5
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Hey, does anybody know if they even still make the Radioshack digital SPL meter? I seem to be having trouble finding it. If not, what's the next best cheap, but reliable version to purchase?
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Old 5th April 2013   #6
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I guess this is all they got;
Digital Sound Level Meter - RadioShack.com

Others in the price range:
SPL / Sound Level Meters in the Pro Audio Department at Parts Express | 1741

(I have the CM-130 & wish I had held on to the old Radio Shack model 33-2055- as it had a tripod mount and is a bit more 'standard'.)


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Originally Posted by eighttwelve View Post
Hey, does anybody know if they even still make the Radioshack digital SPL meter? I seem to be having trouble finding it. If not, what's the next best cheap, but reliable version to purchase?
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Old 5th April 2013   #7
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mcm electronics also has some inexpensive SPL meters, but I have no experience with them. I think I got my Radio shack meter used off E--Y a couple of years ago.
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Old 5th April 2013   #8
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Good to know. I'd say it's pretty accurate for the price : )

I think anyone *relying* on this meter should / is checking at a screening room or bigger mix room.

Love the RS, its a classic : )
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