I agree with all the above, but if you have a burning desire to check your system, here's how you can do it for free -
Get "RTA Lite" for your phone. Get "15-minute pink noise track" here -
http://www.audiocheck.net/testtones_pinknoise.php
Play the pink noise mp3 just like you'd play a song, one channel (left or right) at a time to eliminate combing.
Hold the phone with the mic aimed at the speaker, as far from your body as possible (to eliminate boundary effects), out on the dance floor, with RTA Lite running.
Obviously, this is not super accurate, but it will show if you have any real suck-outs or peaks in your system that are bad enough that EQ is necessary.
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