JBL car audio modification, STAGE-A9004 four-way amplifier audio processor, support high and low level input - AliExpress
JBL Stage A6004 4-channel car amplifier * 60 watts RMS x 4 - Breakers Stereo and Performance
Amplifier, Four Channels, Stage Amplifier A9004, Jbl Stagea9004, Automobiles And Motorcycles , Car Electronics , Car Audio , Speaker Line - Speaker Line - AliExpress