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Is there a way to switch Amp source for a single set of speakers?

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  • Is there a way to switch Amp source for a single set of speakers?

    I have one listening space which is also the HT space. I have a decent Onkyo TX-NR555 AV receiver, but am enamored with the idea of a better amp for music. Is there any sort of device available or that could be made to power a single set of speakers (currently KEF Q100, but am building a pair of Classix 2.5s) from 2 different amp sources. I'm imagining speaker cables going into this from each source and a single set coming out with a switch to let you select the amp/receiver source. not going to have 2 sets of speakers in the room. Would obviously connect turntable to the "better" amp, plus some sort of digital source

  • #2
    Some amplifiers are not all that happy running unloaded. What is more commonly done is that you use the front L+R pre-out from your home theater receiver and send that into the inputs on your nicer amp so that you can just use it as the front L+R amp when you're watching movies.

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    • #3
      The Onkyo doesn't appear to have preouts.

      I have stereo LXminis and a separate HT system. Kept it small, no problem.

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      • #4
        Just use the pre-out for zone-2.
        Wolf
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        • #5
          Duh.

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          • #6
            I did this with a very simple A/B switch put together with parts from PE.
            It worked for both 2 sources or 2 speaker sets.

            https://postimg.cc/gallery/17g7b8qme/

            Andy.

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            • #7
              Define 'better amp'. 0.08% THD isn't exactly shabby. It might be a bit underpowered, AVRs never meet their claimed spec with all channels driven, but that's more likely to be a problem for surround HT than for 2 channel music.
              www.billfitzmaurice.com
              www.billfitzmaurice.info/forum

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              • #8
                Originally posted by Wolf View Post
                Just use the pre-out for zone-2.
                Wolf
                Hmm, I have Zone 2 passive speakers already wired for downstairs, I wonder if having Zone 2 preamp outs connected to 2nd amp will kill the ability to drive those Zone 2 passive speakers. Will have to look at the manual or just try it an see

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                • #9
                  Originally posted by billfitzmaurice View Post
                  Define 'better amp'. 0.08% THD isn't exactly shabby. It might be a bit underpowered, AVRs never meet their claimed spec with all channels driven, but that's more likely to be a problem for surround HT than for 2 channel music.
                  Guttenberg's review today of the Cambridge Audio AXA35 brought on a case of G.A.S. I'd looked at going with a "hi-end" A/V receiver. Those get really pricey and that Onkyo has some really cool features like Spotify Connect which I use quite a bit.

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                  • #10
                    Originally posted by andykriech View Post
                    I did this with a very simple A/B switch put together with parts from PE.
                    It worked for both 2 sources or 2 speaker sets.

                    https://postimg.cc/gallery/17g7b8qme/

                    Andy.
                    That's what I was thinking about. Didn't know if a pre-made switch like this already existed. Looks easy enough. Do you happen to have a part number for the switch/board?

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                    • #11
                      Originally posted by Wolf View Post
                      Just use the pre-out for zone-2.
                      Wolf
                      On the back panel the "Pre-Out" label is identified with subwoofer. Do you mean "line Out"? And does line out have all the A/V Receiver's pre-amp settings in the signal? I would think so but I couldn't get that from the unit's user manual. It only had the line out spec: 2.3 mV at 2.3K Hz.

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                      • #12
                        Originally posted by Millstonemike View Post

                        On the back panel the "Pre-Out" label is identified with subwoofer. Do you mean "line Out"? And does line out have all the A/V Receiver's pre-amp settings in the signal? I would think so but I couldn't get that from the unit's user manual. It only had the line out spec: 2.3 mV at 2.3K Hz.
                        No, Wolf is talking about the separate preamp stereo output that is designated for “Zone 2” on this receiver

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                        • #13
                          Originally posted by mhester View Post
                          Guttenberg's review today of the Cambridge Audio AXA35 brought on a case of G.A.S.
                          A completely subjective review is as useful as mammary glands on a male bovine, unless of course it's done in a double blind along with other amps.

                          www.billfitzmaurice.com
                          www.billfitzmaurice.info/forum

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                          • #14
                            Originally posted by paulbirkeland View Post
                            Some amplifiers are not all that happy running unloaded.
                            I believe this is typically an issue limited to amps with transformer output stages, like a lot of tube amps.

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                            • #15
                              +1. The output devices of an SS amp with no load don't produce current, so it's not a problem. Power tubes put current into the output transformer primary whether there's a load or not. That current can cook the transformer and blow the tubes when the lack of a load gives it no other outlet.
                              www.billfitzmaurice.com
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