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Pre-outs
#269850 08/19/09 07:59 PM
Joined: Dec 2007
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fredk Offline OP
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I'm curious as to how pre-outs in a receiver work. I was expecting something in a menu somewhere to enable the pre-outs but it seems not.

Does this mean that there is always a low level signal applied to the pre-outs? Are the pre-outs on a common circuit with the one that supplies the signal to the internal amps?

I noticed in one of the newer Denon manuals that it tells you not to connect anything to the pre-outs while you are using the main speaker outs, but it does not explain why.

Inquiring minds want to know...


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: Pre-outs
fredk #269869 08/20/09 01:09 AM
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Just based on strictly anecdotal information and having used AVR's most recently with outboard power amps, I am assuming there must be some sort of common signal(low level perhaps) with the option of plugging in to the pre-outs which automatically shuts off the internal amplifiers. The AVR then turns in to and pretty much acts like a stand alone pre-pro. I am not exactly sure why Denon would mention the warning of having speakers hooked up since the power would shut off immediately to those speakers the instant you plug the pre-pro connection in to an outboard amp.

In my opinion, good AVRs sound excellent with outboard amps and having tried both stand alone pre-pros and the AVR/pwr amp combination, I have never subscribed to the "theory" that stand alone pre-pros sound noticeably better.

Re: Pre-outs
fredk #269872 08/20/09 01:50 AM
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Fred, "applied" wouldn't be quite the way to describe it. The arrangement can be looked upon as an internal "Y" from the pre-amp, with one branch for each channel sending voltage to the built-in output transistors for that channel and the other branch going to the pre-out. If the pre-out isn't connected to anything, no voltage is output there. No apparent reason for the Denon caution, since sending voltage to both the internal output transistors and out the pre-out to an external amplifier shouldn't cause any problem.


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Enjoy the music, not the equipment.


Re: Pre-outs
JohnK #269898 08/20/09 09:39 AM
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fredk Offline OP
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Thanks gents. John. Your description is more precise, but thats what I meant. Interesting. I could actually set up 4 zones with this receiver using the B channel pre-outs. Hmmm. Livingroom, bedroom, kitchen, bathroom...


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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