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Thread: How can I tie two inputs to one amp or 2 amps 2 one speaker ??

  1. #1
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    How can I tie two inputs to one amp or 2 amps 2 one speaker ??

    I guess Iíd have to say Iím a newbie Ė that hurts.

    Iím a PC tech, Iím building something so un-necessary that itís a good thing. I have everything figured out except the speakers. I have already read through some of the audio posts but havenít seen exactly how to do this. I see lots of you donít want to do this but in my case I do?

    I have a Mocha PC, the all in a little box PC, no ATX power supply, tougher to work with but fits entirely! In my console Ė finding a quality 19volt scientific like power supply was a pain.. I have PC controller card to turn it on and off, 2 batteries, Oronico gold w external antenna, extra amp, yadda, yadda , yadda. It will be nice.

    The problem is audio. I want, and yes I want, to continue to use the stock HU, it ties into a decent sound system, is easy to use, has a built in changer, and most importantly, I want to listen to music, or the news, while I want the GPS to tell me when to turn left or right. I want separate volume controls for both. I want to turn up, or down, the volume one the HU and still have the gal telling me when to turn. All that said, all the posting are about extra amps or running the HU through the input of the PC. Thus I canĒ

    1. Run the HU through the PC sound inputs. Crappy solution here as my PC has basic built in only sound. I donít want to loose this or be tied into using the PC to control the stereo
    2. Put in a separate amp w separate speakers Ė good but not a lot of room for an entire separate set of speakers
    3. OPTION #3, either (a) find a way to splice inputs to the amp for the HUD, and amp on, and tie in the PC before the amp, if there is an amp on an 97 Avalon, or (b) Splice the amp outputs to the existing speakers, maybe put in diodes?

    Does anyone know how to make this work. Again, I want the factory stereo to work as-is and tie in the PC for GPS, DVDís and MP3ís through the same speakers but how??

  2. #2
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    ummmmmmmmmmmmm







    yeah........



    I'll just post to this to see if anyone else can come up with anything....i'll be interested to know
    Jan Bennett
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    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  3. #3
    Variable Bitrate SickVette's Avatar
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    Well...I did a little searching and came up with one possible easy to use product but I am not sure it is made anymore by Peripheral Electronics. I can find out this weekend though. Unless there is a way to input audio into your radio you will need a switcher of some sort. You can make a manual switcher with some relays and a toggle switch that is easy. But not as cool as if it switched on it's own. Do you know if your radio controls a CD changer? Funny things I could point you to several products that would do the job for you if your car was a 98 Avalon.

  4. #4
    Variable Bitrate
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    Some do, some don't

    Some 97 Avalons have an external stereo component amplifier and others do not. In particular, the 6 speaker system does not. The 7 speaker system DOES have a factory external amp. The seventh speaker is the subwoofer. So, if you have a subwoofer, than you have an amp. If you do not have a subwoofer, than you do not have an amp. This is from wiring diagrams available from Powerlibrary, not a Toyota repair manual, but I beleive the information is accurate. I can email you the stereo system wiring diagrams (pdf) if you like.

    [email protected]
    Later

  5. #5
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    It is a 98

    It is a 98 Avalon, not sure why I wrote 97, does that make a difference?

    Also, if there is a CD input I couldn;t have both running at the same time.

    There must be a way to combine line level inputs?

  6. #6
    Constant Bitrate accentsound's Avatar
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    You can not do this with a unamplified stock system. The only wayt to accomplish this is with a externally amped system. Then you have to get a High level to low level converter for your HU. Then you can use a stereo input mixer to combine the HU and PC audio outs. The amp (4 channel most likely) will drive the existing speakers. But expect your stock speaker will not last long amplified. This is the only way you will be able to listen to music and at the same time hear the GPS. If you only wanted to have one at a time to listen to then all you would need is either a FM modulator or a HU with a AUX in.

  7. #7
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    Thanks,

    I give up on the idea of 2 amps on one speaker. I know that I have a factory am now as well. i don;t mind replacing that with a better one. So how do I tie together, mix, two sources. i know radio Shack sells a cheezy mixer console, I own one, but is there a part for a car, and should this work?

  8. #8
    Fusion Brain Creator
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    Quote Originally Posted by microtime
    Thanks,

    I give up on the idea of 2 amps on one speaker. I know that I have a factory am now as well. i don;t mind replacing that with a better one. So how do I tie together, mix, two sources. i know radio Shack sells a cheezy mixer console, I own one, but is there a part for a car, and should this work?
    why cant you combine 2 amps on one speaker? I am pretty sure it'd work.

    dont use diodes, they will chop the AC

    mixer boards do the same as you are proposing, only at lower level (mix audio)

    $5 says you can run 2 amps on one speaker.

  9. #9
    Maximum Bitrate Zebelkhan's Avatar
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    I did exactly what you want to do. I built a switcher box with a simple relay and used remote turn on of my HU to tell it when to switch. Sound from carputer goes to this relay. If I am listening to my MP3s, the carputer sound, including GPS connects to the HU and comes out of the car's sound system. When I am listening to the car radio or play CD, the remote on wire on the HU switches the relay so now carputer audio gets connected to a small speaker and I can listen to GPS on that while radio or CD in playing on the sound system. My carputer sound is not amplified so I used a little amplifier from a hands free phone set up to raise its volume. It works great, but your HU has to have a remote wire for automatic switching, or you can just install a little switch to manually activate the relay. This is the exact relay I used.

    http://www.allelectronics.com/cgi-bi...-12&type=store
    Compaq Evo D510 e-PC - P4 2.0 - 512M RAM - 120G 3.5 HD - 7" Xenarc 700TSV - DSATX fitted nicely inside the PC case

  10. #10
    Fusion Brain Creator
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    Quote Originally Posted by Zebelkhan
    I did exactly what you want to do.


    no, you didn't.


    he wants to have both playing at the same time

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