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#269850 - 08/19/09 03:59 PM Pre-outs
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7031
Loc: Canada
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...
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#269869 - 08/19/09 09:09 PM Re: Pre-outs [Re: fredk]
casey01 Offline
aficionado

Registered: 07/03/08
Posts: 761
Loc: Toronto
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.

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#269872 - 08/19/09 09:50 PM Re: Pre-outs [Re: fredk]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10363
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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#269898 - 08/20/09 05:39 AM Re: Pre-outs [Re: JohnK]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7031
Loc: Canada
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...
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