Wet Sounds: Issues with brand new XS-650's

I just installed 3 pairs(6 total) of brand new Wetsounds XS-650's powered by 2 SD-6 amps

on each SD-6 amp(one for left side of boat, one for the right side):

channel 1: 2 XS-650's
channel 2: 1 XS-650
channel 3&4: REV10
channel 5&6: REV10

Everything works perfectly except the XS-650's sound like they have absolutely no highs(treble), they sound "bland".

for trouble shooting so far i have tried:

-adjust bass/trebble on head unit
-check the HPF/LPF/Full setting on amps, all are set on HPF
-adjust the frequency on crossovers, went from one extreme to the other, it only changed how much mid-bass the speakers produced
-checked input signals, Thinking the head unit had some sort of filter turned on or the RCA's were bad. Took the RCA input from my tower REV10's(channels 3,4,5,6) which play perfectly and plugged them into channels 1&2, same issues

Am I missing something? Do the XS-650's have another terminal/input for the tweeters that I didn't hook up?


***All equipment was purchased from an authorized WS dealer.