Sherwood RD-7503


Novice Member
I have a Sherwood RD-7503 - and have connected a DAC to it - on the EXT/IN of the AMP.
Looking at the manual of the Sherwood it notes for the connections as follows:

“In case of 6 or 7 channel outputs, do not connect both of the SURROUND BACK L and R inputs or the SURROUND BACK R input of this UNIT. (for details refer to the operating instructions of the component to be connected)”

I am testing all channels via the DAC SoundBlasterX3 using the control panel 7.1 and I am able to receive test tones on all channels as follows (front - R/L, Centre, Side R/L and Subwoofer) however I am not receiving and test tones on the Surround Back (R/L)..

What do I need to do to enable these to work?

See image below for the connections I have made using the RCA ro 3.5mm cables and not the adapter

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