just bought one of these and was testing it yesterday
i connected the sub + and sub- wires to the 2 wires that go to the left speaker
this way i don't need to run new input wires
this basically taps the left speaker wire to the bose amp input
works well!
i also connected the remote wire to the power wire, this way it's always on
but i will wire the power and ground to the rear hardtop defroster cable plug thats on the rear shelf
this way the sub is only on when i turn on the defroster switch
but the rear speakers are always on
rear speakers i hooked up to the rear speaker out on the CDR-220
i put some dynamat on the interior walls of the sub box
and stuffed it with polyfill as well