Take a look at the $150 ETF 5 acoustic measurement software package at ETF Acoustic. It runs on a Windows PC with a two channel sound card. You can use the ubiquitous Radio Shack SPL meter as a microphone; ETF can supply a correction file to offset the RS meter's frequency response deviations. ETF does measurement as narrow as 1/12 octave and can present the data in a number of ways including those nice waterfall charts you see in Stereophile's speaker reviews. You can also gate the measurements to remove the effects of room reflections. ETF is an awesomely powerful tool and a steal at the price.
RTA recommendation
Seeking input from experienced users for an affordable RTA with sufficient resolution to optimize speaker performance and subwoofer placement. Behrenger, Gold Line, other? So far, I have been advised by two very experienced users that an RTA can be more misleading than helpful, without sufficient experience operating and interpreting results. Being stubborn, I want to experiment regardless.
Regards,
scott
Regards,
scott