Radio Shack SPL meter correction (1 Viewer)

[Nathan Stohler]

I bought the digital version of the Radio Shack SPL meter a few weeks ago. I was planning on generating some tones to check the frequency response of my speakers.

I've seen various correction charts for the analog version, and I was wondering:

1) Do these charts apply to the digital meter?
2) Does anyone know if the correction factors are indeed necessary?
3) If so, can someone point me to a reliable chart?

Thanks in advance.
--Nathan

 

[Steve Griswold]

While we're on the subject, I have the "new" analog meter from Radio Shack. Does anyone know if this is subject to the same corrections as the old one?

 

[Wayne A. Pflughaupt]

I haven’t heard, so I can’t say.

Here are the correction values.

10Hz +20.5
12.5Hz +16.5
16Hz +11.5
20Hz +7.5
25Hz +5
31.5Hz +3
40Hz +2.5
50Hz +1.5
63Hz +1.5
80Hz +1.5
100Hz +2
125Hz +0.5
160Hz -0.5
200Hz -0.5
250Hz +0.5
315Hz -0.5
400Hz 0
500Hz -0.5
630Hz 0
800Hz 0
1KHz 0
1.25Khz 0
1.6KHz -0.5
2Khz -1.5
2.5Khz -1.5
3.15Khz -1.5
4KHz -2
5KHz -2
6.3KHz -2
8KHz -2
10Khz -1
12.5KHz +0.5
16KHz 0
20KHz +1


1/6-octave bass compensation for bass:

16Hz +11.5
18Hz +8.0
20Hz +7.5
22Hz +6.5
25Hz +5.0
28Hz +4.0
31.5Hz +3.0
36Hz +2.5
40Hz +2.5
45Hz +2.0
50Hz +1.5
56Hz +1.5
63Hz +1.5
71Hz +1.5
80Hz +1.5
89Hz +1.5
100Hz +2.0
111Hz +1.0
125Hz +0.5
142.5Hz +0.5
160Hz -0.5


Regards,
Wayne A. Pflughaupt

 

[Nathan Stohler]

Thank you, Wayne.

That's much different than the chart that I found on the web. For what I'm doing, I think I can ignore the corrections. I was doing some calibration last night, looking for peaks in valleys in the response of my speakers, so 1 or 2 dB here and there doesn't matter much to me.

Also, my sub doesn't do a whole lot under 30 Hz, which seems to be where the major discrepancies are.

I'll save this table away though for future use.

Thanks again.
--Nathan

 

[Wayne A. Pflughaupt]

Forgot to mention (but maybe you already knew), you're supposed to add the posted values to the meter's reading.