I would not expect the Amp to power down with "turning off" your music, as the audio system does a lot more than music. It also handles hands-free phone functions and ANC.I just installed sub amp. I'm using A21 to for the amp on/off. It can turn on the amp, but it can NOT turn off it. I checked the output of A21, it is always +12V after the vehicle is powered on. I expected it went 0 when I turned off the audio.
I'm still looking for which wire can be used to turn on/off external amp.
Thanks. That makes sense. I will build my own audio signal detector from front speaker output to turn on/off the amp.I would not expect the Amp to power down with "turning off" your music, as the audio system does a lot more than music. It also handles hands-free phone functions and ANC.
No, I didn't use LC2. The amp has all features of IC2 except auto-sensing audio signal. I will add an audio signal detector, it cost ~$5.Are you using a lc2? Or are you just going straight from wire. My lc2 is what turns my amp on and off it feels a signal from the speaker wires and automatically turns it on and off when I power on and off the radio. Also it converts the high frequency to low frequency which is important if you are adding a subwoofer.