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mb quartz 216 rsd comp. speakers. The treble seems so high

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you installed the most notoriously 'bright' tweeters on the market...

if they bother you, and you aren't inclined to replace them, you can

first, check the wiring of the speakers... if you can "barely hear" the midrange, you could have mixed up the phase somewhere along the line... i.e: make sure all the '+'s are wired to '+'s and '-'s to '-'s

a) adjust the passive x-overs: most quart 'musicomp' passive x-overs have an attenuation circuit for the tweeters... look for '0,-3,-6' dB markings... adjust...

b) adjust the active x-over on the amp: i'm not sure about the newer directed amps, but older ones used a rotary frequency selector on the active x-overs... turn it slowly either way (if this is the problem, most likely counter-clockwise) until it sounds better...

c) adjust the eq on your empeg: cut the higher frequencies