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In Reply to: RE: Passive preamp RCA output to SUB amp? Question on current configuration posted by bullethead on June 30, 2017 at 03:40:12
From what I'm reading you are saying the sub isn't loud enough?
If the signal is coming from a passive - you don't have enough signal.
Does you preamp and amp have RCA inputs available? Is so try the setup with the RCA cabling and see if the preamp has enough signal to get as loud to suit your needs.
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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