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  1. #1

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    Default 3 Channel Stereo?

    I have been looking around at some different vintage tube amps, thinking I might like to get one just to tinker around with. I am an oilfield electronics technician, so home audio equipment is a little removed from my area of expertise, and I have only recently (1 year?) taken this up as a hobby.

    I have seen several of these vintage amps that have a "center" speaker output, controlled by a switch rather than a potentiometer. What is this? Could it be used to drive something like a passive subwoofer? If not, what do you do with it?
    2 Channel rig:
    LSi9"s (modified xover's) & HSU Sub
    Harman Kardon HK 990 Amp
    Onkyo C-S5VL SACD
    Music Hall MMF 5.1
    Furman Elite 15

    HT rig:
    HK AVR-745 & Polk Monitor Series

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    My McIntosh MX115 has a L/R pre out along with the usual L and R. I had a sub hooked up to it briefly. The signal worked fine, but had other problems with the setup.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

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    Back in the day -- when you had speakers designed to be in corners...

    Sometimes they were spread apart real far -- and needed a center speaker to fill in the center...

    Klipsch was one of the first to use it --

    And now its used in HT of course
    www.Vr3Mods.com ///// www.Version3Audio.com

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro

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    IMO, 2 channel is where it's at for critical listening.
    In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence.

    "The best way to enjoy digital music reproduction is to never listen to good analogue reproduction". - Kenneth Swauger

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    I am wondering if this output could be used to drive a mono passive subwoofer.

    Anybody ever done something like this before??

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    It would be OK if you had the full signal going to the center channel with lower frequencies not cut out*. It also depends if the center signal is taking away from the mains. If that's the case, then no.

    It would assist us to assist you if we knew the particular amp you are referring too, as different gear is not always designed to do the same thing.

    *there's more to that, but just trying to K.I.S.S. for now.
    In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence.

    "The best way to enjoy digital music reproduction is to never listen to good analogue reproduction". - Kenneth Swauger

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    One amp I was looking at is a Fisher KX-200. There was another one, a Fisher receiver that has the same type setup on it, but I can't remember the model number.

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    As long as you have a crossover somewhere between the pre and sub, give it a try.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

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    These appear to be speaker-level outputs, not preamp outputs.

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    Trey hit it correctly but there is more. Alot of music especially classical was recorded in three channel "stereo." As a matter of fact some of the Living Stereo SACDs are recorded with both the 2 ch layer and the 3 ch layer. I was thinking of giving them a try on my HT just to see if I get more of that sense of hall presence more then I get with my 1.2 TLs. The 1.2s really are great for giving that sense of presence.

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    +1 Joe, the way RCA did the recording the three channel was intended, I believe there is something to this, one of my first pre/pro's had a 3 channel mode and it really did sound good. I remember the vocals on some cd's had some added presence and depth.

    If you can try just a center channel, experiment a bit and see what you get.

    RT1
    REEL TIME THEATRE
    Onkyo-TX-NR5007
    B&K 7270 amplifier
    Polk SWA-500 Subwoofer amplifier
    OppO BDP-83
    Pioneer Elite 50"
    Polk LCi-RTS-105;LCi-RTS-C;LCi-RTSFx;LCi80Fx
    Subs-Twin Polk CSW200
    HTS5000


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    BAT VK-31SE
    VTL MB-450 Signature monoblock
    Wolcott Presence monoblock
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    Acoustech Phono-Pre
    Sound Lab Millenium ELS
    BillyBags Rack
    MIT S1/3 cables
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    Everthing Matters...Tubes Rule...and It's Over until it's Not Over

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    I'm curious to know if the center channel is a full range output, reduced power or what. I am also wondering if it will alter the power or sound going to the main speakers.

    Anybody know?

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    It would really have to tell on the make and/or model. Most likely the center is a blend of some sort between the left and the right. It might be equal to left + right, (left-right) + (right-left), or something else. Different manufacturers used different methods.
    Make it Funky! :)

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