Passive Preamps

I second Tholt on the Promitheus TVCs. One more point I would like to add is that in case of TVC the amp's input sensitivity is VERY important. With a TVC, the input sensitivity of a power amp better be below 1.5V. With this n mind, there is absolutely no loss of dynamics or body or weight. The positives aspects with the addition of a TVC in your system are something to be heard and seen rather than describe in a thread.
So, system matching is very important.

One more point I would like to add is that in case of TVC the amp's input sensitivity is VERY important. With a TVC, the input sensitivity of a power amp better be below 1.5V.

Why is this? Is it because of the TVC volt-to-current conversion from the source? ie an amp with lower input sensitivity means it's easier to drive to full output power? apologize for the laymans terms. What would a 1.5v or higher amp input sensitivity equate to sonically?

Tholt,
no need to apologize. I was not aware of the significance of these measurements till I asked these same questions to a GURU on this forum. He has explained in detail about the TVC and the attenuation it does to the incoming volts. Send me a PM and I can send you the explanation he gave me.

PM sent