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Re: Radio Shack SPL Meter

166.82.49.163

Set the meter for "C" weighted, Slow. For best results, set the meter on a tripod to keep reflections at a minimum. Get a Test CD that has 1/3 octave warble tones like Stereophile Test CD #3. Start with the 1 kHz tone and set the meter at 80 dB and set the 1 kHz tone to show 0 dB on the meter. I would suggest setting the meter at you listening position to see what the response is there. Start the test tones and with the chart I am suppling below, mark the level beside the frequency on the chart. You can do the corrections after you finish. Stand as far from the meter as you can when doing this so reflections off of your body does not influence the reading. Also try not to have anything else to near the meter. This will give you a close approximation of what the frequency response is of your speakers at your listening postion. Below is the correction chart. Everything is added.

20 Hz.______________________________________________________________________ 20HZ 6.2DB
25 ______________________________________________________________________25HZ=4.4DB
31.5 ________________________________________________________________________31.5HZ=3DB
40 ________________________________________________________________________40HZ =2DB
50 ________________________________________________________________________50 =1.3DB
63 ________________________________________________________________________ 63HZ =.8DB
80 ________________________________________________________________________ 80 HZ =.5DB
100 ________________________________________________________________________100HZ =.3DB
125 ________________________________________________________________________125HZ =.2DB
160 ________________________________________________________________________160 =.1DB
200 _Start___________________________________________________________________ Flat
250 ________________________________________________________________________ Flat
315 ________________________________________________________________________ Flat
400 ________________________________________________________________________ Flat
500 ________________________________________________________________________ Flat
630 ________________________________________________________________________ Flat
800 ________________________________________________________________________ Flat
1kH________________________________________________________________________ Flat
1.25________________________________________________________________________ Flat
1.6 ________________________________________________________________________1600HZ = .1DB
2 ________________________________________________________________________2000HZ =.2DB
2.5 _Start___________________________________________________________________ 2500HZ =.3DB
3.15________________________________________________________________________3150HZ =.5DB
4 ________________________________________________________________________4KHZ =.8DB
5 ________________________________________________________________________5KHZ =1.3DB
6.3 ________________________________________________________________________6.3KHZ =2DB
8 ________________________________________________________________________8KHZ =3DB
10 ________________________________________________________________________10KHZ =4.4DB
12.5________________________________________________________________________12.5KHZ =6.2DB
16 ________________________________________________________________________16KHZ =8.5DB
20 ________________________________________________________________________20KHZ =11.2DB





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