Yes, GM-x554 guess i should have mentioned that at the start
found the manual online
here are some specs
dont know why it says input should be output right?
heres the link to the manual DL
http://www.nodevice.com/user_manual/pioneer/car_amplifier/gm-x554.html
Four-channel
Subwoofer Nominal input: Min. 60 W
Other than subwoofer Max. input: Min. 100 W
Two-channel
Subwoofer Nominal input: Min. 155 W
Other than subwoofer Max. input: Min. 240 W
Three-channel Subwoofer Nominal input: Min. 60 W
Speaker output A Other than subwoofer Max. input: Min. 100 W
Three-channel Subwoofer Nominal input: Min. 155 W
Speaker output B Other than subwoofer Max. input: Min. 240 W