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Thread: Problem relocating amp and subs

  1. #1
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    Problem relocating amp and subs

    I recently upgraded my system and gave away my old p2002 RF amp and 10" alpine subs to my neighbor. They worked great in my car. In his it is hardly getting any power to the 10" subs at all. The subs are good (I just pulled them out of my car) but sound is extremely weak in his car. Only thing I can think of is either his head unit has issues or the rca's are bad. I checked and ground and power supplies are good

  2. #2
    Maximum Bitrate crooper's Avatar
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    Might need to re-adjust the input gain since you have different head units. Also, what sounds great in one car may not sound as good in another. Maybe he has the speakers in a bad location.

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    Constant Bitrate krnpimpsta's Avatar
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    Either gain, or I would double check ground. While the amp & subs are on and playing music, use a voltmeter to see the voltage between the 12V and GND ports on your amp. If it's not 13V+, then then your ground is not good enough.

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    What I mean by weaker is I can barely hear the subs. The gain is set at about 3/4 and there isn't much of a difference. He put a meter on the ground and it was fine

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    Maximum Bitrate boomintrac's Avatar
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    what kind of car was the stuff in and what kind of car did the stuff get put in, could also check phase.
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    Constant Bitrate krnpimpsta's Avatar
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    Quote Originally Posted by perrottela View Post
    What I mean by weaker is I can barely hear the subs. The gain is set at about 3/4 and there isn't much of a difference. He put a meter on the ground and it was fine
    What I mean is, you can have a bad ground while still having a connection from the battery. Just because you see 12V when nothing is running does not mean it's a good ground.

    A bad ground will have resistance that will only show itself by lowering your amp's input voltage when current is passing through it b/c of Ohm's law (V=IR).

    A bad ground will look perfectly fine on a meter if your system is not running. Have you tried testing the voltage between +12V and GND while the system is running and playing music?

  7. #7
    Maximum Bitrate Woofnstuff's Avatar
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    whats feeding the amps, direct from the head unit? front, or back or sub output?

    assuming there is no bass cut feature turned on on the head deck.

  8. #8
    Newbie BasslineMilitia's Avatar
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    aye.. am i reading this correctly...? running subs directly from the head deck??

    and phase isnt really an issue, sure it will sound different but if you hooked teh speaker up out of phase you'll still get output.

    check your leads. When people take gear out of our shop to use they give us a call at 2am in the morning, we get there, and they are using their own crusty lead and not the ones we supplied. The leads are always the weekest link.

    next is a switch or knob or function etc thats turned on or switched into the wrong position.

    Plugged it into the wrong output? sorry had to ask XD

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