Is my frequency response bad?

[catapult]

Peaks and nulls aside....

I bought a cheap SPL meter recently

Have you checked that you are getting flat response from the meter. Many of the cheap ones apply A or C weighting to the response, meaning you need to apply an inverse correction curve if you are measuring individual frequencies. The bass and the highs will measure lower on the meter than they really are.

[SimontY]

Originally posted by catapult
The bass and the highs will measure lower on the meter than they really are.

I know. The meter is said to be +/-3db over a wide range (can't remember exactly), only excluding deep bass and high treble (neither of which are worthwhile to measure).

I think C is actually full range, or at least as full as the mic. bit can allow. I realise A weighting is bandwidth limited.