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Testing an amp/sub in situ with seperate battery

Discussion in 'In-Car Entertainment' started by Syzygy, Mar 15, 2008.

  1. Syzygy
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    Syzygy Member

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    [Mar 15, 2008]
    I've got an amp and sub lying around I want to try in place of my S3(8L) Bose sub so I've made an adaptor for the existing loom socket in the boot following Andy Mac's pin out. I thought I'd test the sound quality before running the power cable through the car by using a separate power source in the boot for the sub.

    I've got one of these portable jump-start battery things and it runs the sub fine if I plug it into an audio source like an ipod. However when I connect it up to the wiring in the car it doesn't make a sound. Is there some technical reason that using a second battery won't work due to grounding or something? Does the remote-on pin need to be used from the car wiring??
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  3. defblade
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    defblade No gears! CVT :)

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    [Mar 15, 2008]
    You need to give it a remote-on signal as well as main +ve.... for testing purposes, you can just run a feed from the power terminal; just remember so long as the battery is connected, the amp is on.
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  4. Syzygy
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    Syzygy Member

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    [Mar 16, 2008]
    Cheers but I already had that hooked up. Like I say it works fine from any other audio source, just not from the head unit. Is the pre-out from the Audi HU not very powerful?
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  5. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Mar 19, 2008]
    You need to complete the circuit between the car audi system and the test system. To do this you need to connect the earth from the jump start unit to the chassis of the car.
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  6. Syzygy
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    Syzygy Member

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    [Mar 19, 2008]
    Thanks Andy! I had a feeling it might be something like that but I didn't really want to experiment with connecting it to the car until someone who knew what they were talking about confirmed it! :)
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