1-PIECE SOLUTION FOR REPLACING THE RADIO OR ADDING AN AMP TO ANY FACTORY SYSTEM ; ADD A NEW AMP TO A FACTORY PREMIUM SOUND SYSTEM OR REPLACE A FACTORY PREMIUM STEREO WITH AN AFTER-MARKET STEREO & RETAIN THE USE OF THE FACTORY AMP ; PROVIDES A 4-CHANNEL SIGNAL LEVEL CONVERTER, INTERNAL REMOTE TRIGGER & A COMMON-GROUND SPEAKER CONVERSION ; ADJUSTS UP TO 4 CHANNELS OF SIGNAL INPUT FROM 2W TO 60W ; ISOLATES THE INPUT & OUTPUT CIRCUITS, BLOCKING DC NOISE & PREVENTING SNAPS, CRACKLES & POPS TYPICAL IN OTHER PRODUCTS ; ALLOWS FOR CONVERSION OF FLOATING GROUND HEAD UNITS TO MATCH COMMON-GROUND SPEAKER SYSTEMS ; DELIVERS LINEAR FREQ RESP -0.5 DB FROM ;20 HZ–20 KHZ