Playing ?pink noise though the system is a MUCH MORE SENSITIVE TEST than any music. It is particularly well suited for phase and frequency response uniformity issues.
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This is because the ear is a good relative measuring tool and pink noise contains all frequencies equally dispersed by octave, the way the ear responds.?
you can easily find pink noise on many streaming sites and test CD’s / discs.
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However you must first learn what pink noise ?sounds like. One readily available source is an Apple iPhone or iPad. Above a few hundred Hz they are reasonably uniform and can adequately train your ear. What you are listening for is smooth sound. Hollow or harsh is bad.
One reasonable test is here.
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There are also many good apps for the iDevices that will give you a graphical display to the speaker response, but those require you both to know how to use and interpret what they are telling you, hence beyond the scope of this discussion.?
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Charlie Conger