Hook up two amps to subs. Oscilloscope, Impressions. And how can you test your subs to see if there working. Charge and discharge should be even. I have a Vox amp with a switchable 8ohm or 16ohm output. They want me to believe that I cannot connect an 8ohm cab to my peavy classic The power steering pump is the most noxious offender, though. Dan's Data letters - Staticky screens, another dodgy car gadget, audiophile insanity, ground loops, and a dude who thinks I suck. We just purchased 4 more to add to them, exactly the same batteries.