Radio Shack Sound Meter Corrections

The Radio Shack Analogue Sound Meter is not very linear in the range used for subwoofer building.

This table comes courtesy of Dan Marx, who runs AudioInnovation, a site for fellow Audio Enthusiasts and Speaker builders. As well as his projects, he has some good info on speaker theory and a links section

There are also some modifications that can be done to the SPL meter to make it more linear. A good discussion thread with both this table and the mods is at Audiogon

Frequency	Correction		Frequency	Correction
10hz	+20dB		500hz	-0.5dB
12.5hz	+16.5dB		630hz	0dB
16hz	+11.5dB		800hz	0
20hz	+7.5dB		1.0khz	0
26hz	+5dB		1.25khz	0
31.5hz	+3dB		1.6khz	-0.5dB
40hz	+2.5dB		2.0khz	-1.5dB
50hz	+1.5dB		2.5khz	-1.5dB
63hz	+1.5dB		3.15khz	-1.5dB
80hz	+1.5dB		4.0khz	-2dB
100hz	+2dB		5.0khz	-2dB
125hz	+0.5dB		6.3khz	-2dB
160hz	-0.5dB		8.0khz	-2dB
200hz	-0.5dB		10khz	-1dB
250hz	+0.5dB		12.5khz	+0.5dB
315hz	-0.5dB		16khz	0
400hz	0dB		20khz	+1dB