Typically this would be installed in a tape loop, but however it's connected it should be at line level. Also, this DBX unit is only for DBX encoded LPs. It's not for use with regular LPs.
dbx Model 21 Decoder Operation Help
I recently got a dbx model 21 decoder for vinyl decoding. Anyone teach me how it works? There's no manual online that I can locate. Record and Play with 1 and 2 inputs/outputs vs. Left Right Channels doesn't help me. I ran RCAs to the PLAY input from the TT and again from the PLAY outputs to the integrated amp. No good :). Thanks for your help.