NO RESPONSE FROM YAMAHA YST-SW305/205. I HAVE A MARANTZ SR-97 & DP870 WITH THE SUB CONNECTED THRU

Question

I HAVE A MARANTZ SR-97 & DP870 WITH THE SUB CONNECTED THRU THE FRONT SPEAKER CHANNELS. THERE IS NO SUB RESPONSE. I ALSO TRIED TO RUN DIRECTLY FROM SUB OUT ON AMP, NO RESPONSE. WHEN RUNNING THE TEST TONE THRU THE AMP ALL SPEAKERS EXCEPT THE SUB RESPOND... CAN YOU HELP PLEASE? THANK YOU RON [e-mail]