Hey, i recently purchased a Reference 604 off of Spddracer (great guy, great seller, but thats besides the point). I was wondering if anyone had any experience benching these or if they originally came with a birthsheet. I understand they are underrated, but it really isn't moving my sub whatsoever. I'm wondering how muhc power it is actually putting out. Its bridged at 2 ohms mono on channel 3&4 and powering components off of 1&2. Thanks
