Dears,
I have 2 Nos. of Bose Bass Modules Acoustimass 300 and having a Onkyo TX NR 555 receiver, please anyone can help me to let me know to connect them both
thank you
In order to connect any active (read self-powered with built-in amplification) subwoofer to an AVR, it requires the subwoofer to have an RCA jack. As far as I can see from on-line pictures and the Bose manual, the Acoustimass 300 Bass Module has no jack of any kind.
Alternately, you could bypass the internal electronics and use it as a passive subwoofer. You can find a piece in my signature ("Tech Articles") on how to do that.'