I never beat the unit, and sound was always adequate. Never really went over 25 on a 50 volume scale. I have all original paperwork and packaging. Of course, I called JVC and it's comical how many times you have to run around before you get any human to talk to. I just talked to some dude in Texas, after pressing numbers for 5 minutes, he has to have the serial number
gotta go pull the deck and find it.
I called Best Buy- three customers in front of me before I talk to anybody- not a good season to get help there. All this for a $75 deck.
I have an old buddy that was into vintage tube stuff, that's really hardcore if you're running it in your jalopy.
Only clue I have is when I turn on the ignition, I get a little audible bump from the speakers, which tells me there is good connections to the speakers at least.
Plus the frigid cold might have something to do with it.