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Fundamentally, you must examine the RTA with a system with a known frequency response to know if it is accurate, or you must obtain a second RTA from a friend which is known to be accurate, to compare against your own RTA.

However it is always a matter of interpreting the RTA results.  One goal is to have a flat frequncy response, and we are inclined toward this by the RTA.  But this has only a little to do with sound since frequency response is only one of many factors going into accurate musical reproduction. 

Just don't fall into the trap that there must always be some correlation.  You can have a flat frequency response and still have bad sound, therefore bad sound doesn't necessarily correlate to frequency response abnormalities.

Likewise, improving frequency response will not necessarily improve the sound, since it may simultaneously make something else worse.

Adrian

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