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  • Looking for a 2-way audio switch

    something that takes 2 stereo rca inputs and you can switch between them. My deck only has 1 set of AUX inputs, I need to be able to share between carputer and Sirius radio. Any suggestions?
    PIII-850/320M/40G + Lilliput Touchscreen

  • #2
    A Y-cable will "mix" the two audio sources. Or, you can get one of many source selectors. Check Radio Shack.
    2006 Chevy Colorado: VIA M10000 EDEN, 1 GB RAM, 80 GB 2.5" Seagate HDD, USB Slim Slot DVD/RW, Holux GPS, MobileVU 10.4" LCD (touch not working yet), VOOMPC Case (blue), 70W DC-DC supply.

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    • #3
      Auxilliary input convertors....

      http://www.logjamelectronics.com/auxinpconv.html

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      • #4
        Originally posted by Jackso
        A Y-cable will "mix" the two audio sources. Or, you can get one of many source selectors. Check Radio Shack.
        Can you please elaborate on the Y-cable. If one source feeding into the Y cable is off how will the HU mix the 2 sources? Thanks!

        -HD

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        • #5
          Y-cable is not a good idea at all. Especially if you have 2 sources on at the same time. Very bad idea.
          PIII-850/320M/40G + Lilliput Touchscreen

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          • #6
            Originally posted by Vadim
            Y-cable is not a good idea at all. Especially if you have 2 sources on at the same time. Very bad idea.
            He is right, a Y cable will not mix... you can actually damage both audio outputs by doing this (by creating a short). If you want to Mix you should use a mixer, just keep in mind that mixing increases noise (noise gets added as well as the music). I would reccomend a switch, you can build them pretty easily or buy them at radioshack.

            Good luck!
            -------------------
            2001 CL Type-S
            2.4Ghz Celeron, Opus, Liliput Jiggered in, but not fully installed

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            • #7
              If your PC is always going to be on when you use the XM and you have more than 1 input on your sound card, you can use that and control it from the mixer for a more even level across all inputs. Some sound cards have extra headers on the card for aux, CD, TAD, and more.

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              • #8
                Originally posted by archimense
                Auxilliary input convertors....

                http://www.logjamelectronics.com/auxinpconv.html
                I think there is a much cheaper solution. I think the switch idea is something like the attached link, but on a smaller (and only audio) basis.
                http://www.circuitcity.com/detail.js...cfkmdffhdfgo.0
                My Carputer! (More Car Pics at the end)
                2 Kicker Comp 10"
                Epia M-9000, 256 MB DDR, 120 Gig HD
                Lilliput 7" VGA Touchscreen
                Check it out?!

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                • #9
                  Originally posted by Curiosity
                  If your PC is always going to be on when you use the XM and you have more than 1 input on your sound card, you can use that and control it from the mixer for a more even level across all inputs. Some sound cards have extra headers on the card for aux, CD, TAD, and more.
                  I was thinking about doing that, but i don't want to be dependent on the comp to be turned on to listen to sat radio. I will probably just get a 2 way switch from radio shack.
                  PIII-850/320M/40G + Lilliput Touchscreen

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                  • #10
                    Originally posted by Wrongway
                    He is right, a Y cable will not mix... you can actually damage both audio outputs by doing this (by creating a short). If you want to Mix you should use a mixer, just keep in mind that mixing increases noise (noise gets added as well as the music). I would reccomend a switch, you can build them pretty easily or buy them at radioshack.

                    Good luck!
                    Actually, if it damages any equipment, you're equipment is already broken. It's all about impedance levels. Line inputs have a significantly lower impedance level than a line output, thus connecting two line outputs together to a line input doesn't cause a problem. Since current always takes the path of least resistance, the lower impedance of the input as compared to the outputs causes the current to flow in that directions as opposed to flowing into the output. If it manages to damage anything, that would suggest that your line output was already damaged and had it's impedance drastically lowered. If this were the case, any time you connected any audio device to this output, the levels would be loaded down so badly that you would never get any audio to the device that you connected.

                    As far as mixers are concerned, a mixer is nothing more than a series of amplifiers with their outputs connected together (usually feeding another amplifier so that you can adjust the "master" levels).

                    I will add that connecting a single output to multiple inputs (usually anything more than 4) is generally bad. This application would require that a distribution amplifier be used. This is again due to the lower impedance levels of the inputs. By paralleling many low impedance inputs you get a much lower impedance, thus sinking the current that is your audio and making it distorted. However, this is off the topic a bit because this is exactly the opposite of what we're discussing here.

                    As the "creating a short" goes, since you are connecting two audio sources in PARALLELL the only way a short could be created is if one of the inputs were already a direct short.

                    Since this has become incredibly long, I will stop here, and finish by adding that I have been a radio station engineer for over six years, and that connecting two outputs to a single input is done thousands of times (this is how monoing is done). If there are any other audio related questions you need the CORRECT information about, feel free to let me know.
                    2006 Chevy Colorado: VIA M10000 EDEN, 1 GB RAM, 80 GB 2.5" Seagate HDD, USB Slim Slot DVD/RW, Holux GPS, MobileVU 10.4" LCD (touch not working yet), VOOMPC Case (blue), 70W DC-DC supply.

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                    • #11
                      Wow, that was long, so what would happend if you have them both on at the same time? Would it just have the two audio sources kind of mixed together?
                      EPIA 800, DWW-7VGA LCD w/Touchscreen, 256mb ram, dvd rom, ati radeon 7000 video card, 80 gb 3.5" hard drive.

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                      • #12
                        Originally posted by bjm2020
                        Wow, that was long, so what would happend if you have them both on at the same time? Would it just have the two audio sources kind of mixed together?
                        Exactly. The levels wouldn't necessarily be the same (that is what a mixer is really used for, making multiple sources the desired "loudness"). If you were to somehow get the exact same audio coming from both devices (which in your application would be virtually impossible), some phasing issues come into play but still nothing that will harm anything. Just makes the -audio sound funny. :-)
                        2006 Chevy Colorado: VIA M10000 EDEN, 1 GB RAM, 80 GB 2.5" Seagate HDD, USB Slim Slot DVD/RW, Holux GPS, MobileVU 10.4" LCD (touch not working yet), VOOMPC Case (blue), 70W DC-DC supply.

                        Comment


                        • #13
                          Originally posted by Jackso
                          Actually, if it damages any equipment, you're equipment is already broken. It's all about impedance levels. Line inputs have a significantly lower impedance level than a line output, thus connecting two line outputs together to a line input doesn't cause a problem. Since current always takes the path of least resistance, the lower impedance of the input as compared to the outputs causes the current to flow in that directions as opposed to flowing into the output. If it manages to damage anything, that would suggest that your line output was already damaged and had it's impedance drastically lowered. If this were the case, any time you connected any audio device to this output, the levels would be loaded down so badly that you would never get any audio to the device that you connected.

                          As far as mixers are concerned, a mixer is nothing more than a series of amplifiers with their outputs connected together (usually feeding another amplifier so that you can adjust the "master" levels).

                          I will add that connecting a single output to multiple inputs (usually anything more than 4) is generally bad. This application would require that a distribution amplifier be used. This is again due to the lower impedance levels of the inputs. By paralleling many low impedance inputs you get a much lower impedance, thus sinking the current that is your audio and making it distorted. However, this is off the topic a bit because this is exactly the opposite of what we're discussing here.

                          As the "creating a short" goes, since you are connecting two audio sources in PARALLELL the only way a short could be created is if one of the inputs were already a direct short.

                          Since this has become incredibly long, I will stop here, and finish by adding that I have been a radio station engineer for over six years, and that connecting two outputs to a single input is done thousands of times (this is how monoing is done). If there are any other audio related questions you need the CORRECT information about, feel free to let me know.

                          You just answered the question I was about to ask! I am building a system into my ride with a seperate HU, 5 channel amp, speakers and one of thos Infinity Basslink self-powered subs. I want the HU to go directly to the amp. I am also installing an indash LCD for a carputer. I also want the 5.1 output of the computer (a la a Dolby digital decoder from my old Midiland 5.1 Computer Speaker system) to go directly to the amp as well. Didn't know this could be done until I read your response. If I understood correctly, I could get a seperate amplified output from my stereo and my HU by hooking up y-cables to each of the low level inputs in the 4 channel amp. The pre-outs from the HU and Dolby decoder can feed into y-cables that go into the seperate, channels of the amp. The center and LFE channel would be plugged in seperately and not be amplified via this 4 channel amp. The center channel I am planning on using is the Clarion SRK-5 which is self-amplified and my sub is self amplified as well. I would have to use a set of y-cables on the sub as well.

                          Based on the above, am I correct to say the following would work? I could use the dolby decoder/computer volume control when listening to a source from the carputer and the volume control from the HU when listening to a source from the HU.

                          One last question. The remote on signal from the HU to the amp. When I want to listen to a computer source (let's say a DVD), to activate the amp, would I just turn on any source on the HU and turn the volume on the HU all the way down so no sound interference would occur? The HU would just activate the amp and since the inputs are connected via y-cables, it will amplify any source it receives. Would this work? Is there a better solution to this remote on issue if you have 2 different sources feeding into one amp?

                          Hopefully this isn't all jumbled up. I tried clarifying as much as possible.

                          Thanks!!!

                          -HD

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                          • #14
                            once again i will recommend this guy

                            http://www.davidnavone.com/detail.asp?PRODUCT_ID=N-806

                            current sensing switch--just what you need
                            99.9% complete.

                            http://www.cardomain.com/ride/212327

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                            • #15
                              I will start by laughing at that device, because he is selling nothing more than a $26 relay to which he has connected RCAs. But if that's your flavor, go for it.

                              HD54321 - You don't really get seperate inputs, you get mixed inputs, which is what you seemed to understand even though you wrote seperate. In theory you could activate the remote the way you have suggested and it should work fine. As an alternative though, I would personally activate the amp via the AUX line from the car. Then the amp is on whenever the car is on, or the key is turned. This would let you get audio from the computer without the headunit on and vise-versa. The downside to this it that the amp is on whenever the car is on, but honestly, how often are you in the car without some sort of audio.
                              2006 Chevy Colorado: VIA M10000 EDEN, 1 GB RAM, 80 GB 2.5" Seagate HDD, USB Slim Slot DVD/RW, Holux GPS, MobileVU 10.4" LCD (touch not working yet), VOOMPC Case (blue), 70W DC-DC supply.

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