I have a old Marantz NR 1605 with its HDMI ARC broken. I want to use it as an external power amplifier. Can i do that ? I have a Marantz SR 6010. It is a 7.2 system which can be extended upto 9.2 channels with 2 pre out. I want to use the 2 pre out for rear height speaker. I tried connecting the pre out(rear height) from 6010 to CD audio in of 1605. I set the 1605 to stereo cd mode. But i am not getting any sound from the speaker. If i run test tone from 1605 the speakers work so i am sure the speaker are connected properly. Is there any other configuration i am suppose to do or connect the pre out some where else on NR 1605 ?