Wetsounds WS-420 EQ Question.

Hello all. I currently have a Wetsounds WS-420 EQ in my boat hooked up to 3 amps. One amp is for the Double Up package from Wetsounds, One amp is for my subs, and the other for the interior speakers. I have all of this wired through a Perko 1 - 2, 1+2 switch with one dedicated starting battery on the #1 bank and another battery and dry cell on bank #2. My problem is that this weekend all of my stereo quit, towers, subs, and interior speakers. I have checked all of my wiring, grounds, and batteries and everything is fine. My amps are all getting power and working great. I checked the in-line fuse behind the eq and the fuse was blown. I have replaced the fuse with the same, and still nothing from the stereo. The eq is still getting power but apparantly no signal for sound. I bypassed the eq, using the rca's from the back of the radio to the amps and everything is up and running without the eq. My problem is when you increase the volume on the eq you get a slight hissing sound like the volume is working, but you only get a faint bit of sound (barely audible). Is is safe to say that the eq has gone bad, has a bad groud internally or what? I contacted Wetsounds tech support on Tuesday and am still waiting for someone to call me, so I figured some of you guys might know something I don't and help me get it back up and running. FWIW the eq is 3 years old. Thanks for any help you guys can give me!