I used this with a CSP2 to enable remote volume control,  inputs for tape, tuner, and cd.     No longer have the CSP2 so  will now  sell this.  Worked great--I did not detect any degradation  of sonics whatsoever.  
Price  $375 plus actual cost of shipping and 3% PP fee.    See pics at US Audio Mart..  Unable to load pics here.   link to listing
http://www.usaudiomart.com/details/649276931-creek-obh22-passive-preamp-with-rem...