Originally Posted By: John Galt
How do I know if I need room correction?
If you want to hear less of your room and more of the source material then you need room correction.
Originally Posted By: John Galt
For instance, are there test tones that I could use in conjunction with an SPL meter that would indicate sonic holes/dips etc. that if corrected, would result in generally accepted better sound?
Sure, you can download a test tone CD here. Once you graph peaks and dips, you'll have to get some sort of external equalizer to correct them. By comparison, you'd get much better results using a receiver that has built-in automated room correction (like Audyssey XT32).
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Sanjay