Nakamichi Soundspace 12 Sub/amp unit input sensitivity

Hi:

I need a service manual or user manual for a Nakamichi Soundspace 12 sub/amp unit.

I know...the service manual is all over the web, but generally only for the remote control or CD units. That doesn't include the sub/amp unit. 

If no one has the manual, it would help me a lot to know the input sensitivity on the RCAs.

Thanks in advance.