Three-Amplifier Active System
This is the active front-stage picture: head unit into DSP, DSP into separate tweeter, midbass, and sub amps, with one clean power and remote sequence.
Remote Turn-On Rule
Head unit remote to DSP remote in, then DSP remote out to the amplifiers. That way the signal-processing layer wakes before the amplifiers and can mute cleanly before the amps lose command.
Keep all amplifier grounds and DSP ground strategy consistent. Active systems get noisy fast when the control path is neat but the power path is sloppy.