inputs.text: troubleno supportnot robust device - purchased unit create relay circuit disconnects speakers amplifiers power power prevent subdued amp pop experiencing support pacaudio nonexistent even though csrs took swipe asked series questions best utilize various functions advertised pro unable answer thehem provided thehem schehematic circuit explanation operation said design engineers would get back notso went ahead circuit experimented programming unit operate circuit success sort circuit worked designed activated series relays delay connecting speakers ads plate amps powered bled capacitor pop causing muffled noise upon starting systehem tr7pro provided battery power relays 5 seconds open speaker circuits give amps time bleed caps relays reconnected speakers nc position relaysexcept operation sporadic tr7pro seehemed get confused would mess sequence programmed actions would stop working altogether need \\reboot\\ meaning would disconnect battery order reset stupid thing worst thing would get stuck midway actions create loud pop speakers stay stuck programmed command briefly power 5 seconds certain relays would discover trying start dead car next morningaggravation thinking done something wrong creating complicated circuit power feeding back tr7 causing trouble added diodes key places circuit eliminate possibility also wired switch series tr7pro could \\reboot\\ without go trouble disconnecting batteryno change systehem worked would perfectly no noise speakers onoff confusion problehem still popped 50 time started getting slight alternator whine front speakers uh oh slight morning got nothing speakers tr7pro seehems ended brief troublesome life not power even though live 12v supply cannot connect tablet reads \\device not connected\\ pc cannot not power alternate usb connection croaked 5 months installing itso effort nothing going rehemove circuit tolerate fact high quality old school amps not come equipped mutedelay circuit irritated pacaudio rolling product well advance trained thoroughly operation putting detailed instruction manual addition irritating unit not appear reliable not asked handle amperage excess specified limitationsavoid