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Thread: Can crossover placement induce noise?

  1. #1
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    Can crossover placement induce noise?

    I have a whining noise that I have isolated to being somewhere between the amplifier (including the amp) and the components. This noise is with the ignition on, even with all RCAs unplugged. I have my crossovers in the front kick panels. The speaker wires are run away from all power and RCAs. Either my crossovers are inducing the noise, or somehow my amplifier ground is. My amp ground is an unpainted bolt to the unpainted chassis. I've tested the ground connected with a DMM and its near-perfect impedance.

    My next test, if others thing it is also a good idea, will be to disconnect the speaker wires from the amp and test for noise. If there still is noise, it is definitely the crossovers. If there is no more noise, it must be the ground.

    Correct?

  2. #2
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    Well, I did the test. I unplugged the speaker wires and the noise is still there. Is it possible that the crossovers are getting EMI from the ECU or something?

  3. #3
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    I answered my own question.

    Yes, crossover placement can definitely induce noise. Mine were next to bundles of OEM wiring which caused the whining noise. moving them 2" solved the problem.

  4. #4
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    It is nearly impossible for your speaker lines to pick up any irradiated noise unless something else is going on.
    Since the speaker lines are an output from the amp there is not any significant energy for it to affect the speaker directly. The thing about noise is that in order for it to impact your system it needs to be amplified. Typically if noise if picked up by a device or wire it happens before or at any amplification unit when the noise is then amplified to a noticeable level.
    The only way a speaker or speaker line can have an affect on noise creation is if the speaker or speaker line is grounding out on the chassis.
    If you want to test out your ground take a DMM and test the resistance from the ground at the amp and another ground like at the radio or battery ground.
    Otherwise it may just be a bad amp.
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  5. #5
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    Quote Originally Posted by pancit175 View Post
    It is nearly impossible for your speaker lines to pick up any irradiated noise unless something else is going on.
    Since the speaker lines are an output from the amp there is not any significant energy for it to affect the speaker directly. The thing about noise is that in order for it to impact your system it needs to be amplified. Typically if noise if picked up by a device or wire it happens before or at any amplification unit when the noise is then amplified to a noticeable level.
    The only way a speaker or speaker line can have an affect on noise creation is if the speaker or speaker line is grounding out on the chassis.
    If you want to test out your ground take a DMM and test the resistance from the ground at the amp and another ground like at the radio or battery ground.
    Otherwise it may just be a bad amp.
    That's pretty much what I was thinking too... until I unplugged the speaker wires from the amp and the sound was still there. It truly was the crossovers picking up interference from some OEM wires.

  6. #6
    Car Audio Moderator durwood's Avatar
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    Yes passive crossovers can pick up noise. It is the inductors in them that pick it up because they act as an antenna. Good troubleshooting.

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