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In Reply to: RE: Passive preamp RCA output to SUB amp? Question on current configuration posted by airtime on June 30, 2017 at 07:29:06
My main amp only has balanced input. The sub amp only has unbalanced RCA input. The pre has balanced XLR and unbalanced RCA out . XLR out to amp, and RCA out to sub amp is the current configuration.
There is bass, just not as incredible as when I was using an active preamp.
I think you just answered you own question. You NEED the gain of the active preamp. Or at least the sub does. You could run a line to the active preamp FOR the sub. But now you're really making things complicated. And in audios setups - that never ends well.
You are loosing too much signal in the balanced input circuitry. The terms passive and balance are some what a contradiction in terminology and ideas.
Got it, thank you very much for helping me understand.
It may also be frequency roll-off if it's a true passive w/o a buffered output. The combo of passive output impedance, capacitance of interconnect cables, and input impedance of the sub could be rolling off freq extremes. Just a thought.
If that's true then again, he needs the active preamp to act as a buffer and gain stage.
I'm a little fuzzy on the balance connection. Isn't the signal slit at the source and then rejoined at terminus? Shouldn't there be a simple buffer stage in that circuit? And how could that all be passive?
As I understand it, this is a buffered passive preamp which has a 6db gain stage that kicks in when needed. Personally I don't like the term "buffered passive preamp". A better description would be an active preamp with unity gain.
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