Boss Audio PH1500M User Manual in English - Page 9

High Level Input Wiring The high level input(s) should only be used when your head unit lacks RCA outputs. If the RCA outputs are not present, connect the speaker outputs from the receiver to the high level input connector of the amplifier. Be sure to observe polarity to avoid audio phase problems. NOTE: Do not connect BOTH the high level and low level inputs from your receiver to your amplifier at the same time! MonoBlock Amplifier PH1500M and PH2500M R POWER R L HIGH LEVEL INPUTS LOW INPUTS L 2V-8V 100mV-2V min max INPUT SENSITIVITY INPUT LEVEL 0 +18dB BASS BOOST LOW FULL MODE CROSSOVER 45Hz 90Hz LOW PASS FREQUENCY PROTECTION REMOTE SUBWOOFER LEVEL CONTROL M OSF E T M ONOBL OCK POWE R AM PL I FI E R R+ R- L- L+ To Speaker Terminals of head unit Remote Subwoofer Level Control PHANTOM MOSFET Amplifier User's Manual - page 9