Jeff Rowland Pre with Pass Labs X350.5 or X600.5

Thanks for all your posts.

Can someone tell me whether the Synergy 2i or the Coherence 2 with separate Rec outputs can be used as a tape loop for using a signal processor.

The spec sheet for the Criterion shows 40 ohm input impedance, Balanced and Unbalanced and Output is 60 ohms Balanced and Unbalanced. The Capri Input is 48 ohms Balanced and Unbalanced while output is 80 ohms Balanced and 40 ohms Unbalanced.

Those impedances are reasonably close to the Pass. I can understand why a recording engineer would be concerned with Unity Gain and exact impendance matching, but for audiophile products I believe that we just need to be in the same range. Correct me if I'm wrong. These levels are so close that it's a matter of turning volume to 75.7 vs. 73, or some similar small difference.

Dave

05-25-08: Arupg asked:

"Can someone tell me whether the Synergy 2i or the Coherence 2 with separate Rec outputs can be used as a tape loop for using a signal processor."

See http://www.jeffrowland.com/ClassicPreamps.htm for details about Rowland "classic" pre-amps.

Dave

A preamp's output impedance (Unbal or Bal) of less than 150 ohms going into a power amp's input impedance (Unbal or Bal) of 20,000 ohms is very, very acceptable & considered a good match.

Question is how do Rowland preamps sound with Pass power amps? Do the JRDG pre have any particular sonic signatures that manipulate the overall sonics?