Unecpected and not understood tweek - help?

I recently purchased the inexpensive Musical Fidelity V-CAN headphone amp. The V-CAN has an input impedance of 25K, and is connected to the Tape-Out of my Krell KAV-400xi with an impedance of 47K. The interconnect is the Kimber Silver Streak. To my point, with the V-Can connected, it seems to pull down the gain a bit, but, the system sounds smoother, erasing some of the aggressive edge the Krell had. What gives? Is this my imagination or is something really going on here? Thanks!
Contact Musical Fidelity with the same question you posed to us. They may be able to give you a better answer or at least a faster one.
If I understand correctly, you are saying that the sound when listening via speakers is affected by the connection of the V-CAN to the Krell's tape outputs.

Does that occur with the V-CAN turned on, or turned off, or both? I would not assume that its input impedance is 25K when it is turned off, and conceivably when it is turned off its input impedance might vary somewhat with signal level, leading to unpredictable effects.

Also, are you sure that the output impedance of the Krell's tape outputs is 47K? That sounds very high for an output impedance, and sounds typical of an input impedance. If the output impedance were really that high I would think it would tend to minimize or eliminate any effects on the amp's main signal path of what is connected to the tape out jacks.

I don't think it is possible to say much more than that without having more information on the design of the Krell's tape output circuit and how it relates to its main signal path.

-- Al
Al, thanks. Yes, when listening through the speakers the sound is affected with the V-CAN connected to the tape-out. The V-CAN does not have a power switch and is on constantly. As far as the the Krell's impedance goes, I know the input is 47K but as far as the tape out I guess I'm not sure. This I do know, powered on or off, with the V-CAN connected to the Krell, the amplifiers hyperactive nature seems to be a bit calmed down.