The benefit of a passive preamp is contingent on impedance matching. We have a situation here where the OP has an Alps pot in the passive unit, the value of which is unknown, but what we do know is that it presents an input impedance to his sources and it has an output impedance that varies based on the position of the pot. Then we have an active preamp as a follower which presents an impedance to the passive. Throw in the capacitance of the cabling and you have a pretty complex arrangement. I have seen situations where people wanted to use a passive as a remote and the Placette passive remote was one of the best to accomplish this. In those situations the passive remote was after the active preamp. The volume control of the active preamp was also set wide open, essentially taking it out of the equation. If you're going to use a combination of active and passive preamps this would be the way I would do it. However, as mentioned already, the OP should ditch the active and simplify the chain by just using the passive preamp. Assuming again that the impedancees matches up.
How do you add remote control to a preamp, here's how.
I purchased a new passive preamp on ebay (made in China) for little over a hundred dollars and.It looks very well built. There is absolutely no gain from input to output. The only thing in the signal path is an Alps volume pot and it is remote controlled. It has four quality inputs and one pair of outputs. I connected my sources to the passive preamp inputs and the pair of outputs to one of the inputs of the non remote preamp. Adjusted the volume halfway on the non-remote preamp. Wella, the remote now controls the volume and input selection via the passive preamp and it sounds marvelous.
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- 29 posts total
- 29 posts total