RRS p400e disturbing sound
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Thread: RRS p400e disturbing sound

  1. #1
    NEWBIE
    Join Date
    October 25th, 2012
    Location
    Belgium
    Posts
    1

    RRS p400e disturbing sound

    I have my RRS p400e since dec.2018 and I have a disturbing sound in the car.
    I suspect it's from the air compressor of air suspension.
    Every time this one goes on/off, I hear a knocking sound on the speakers ( I think)
    The RR dealer says they've already more complaints, but there is nothing they can do about it.
    Is this normal for a €100000 car?
    Are people here with the same problem?
    I've already complained to the importer, but never get a response...

    Thanks
    Johan

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  3. #2
    SOPHOMORE ROVER
    Join Date
    July 30th, 2007
    Location
    Chicago, Illinois
    Posts
    419

    Re: RRS p400e disturbing sound

    I have a 2013 RRSC and there is a single knock that occurs a few seconds after I start the vehicle. This is the subwoofer activating. I have never had any difficulties with this and owned the vehicle for nearly 6 1/2 years. I haven't noticed the same noise when I shut down. I will have to pay attention to that one.

    I do hear the air suspension compressor, at times. But that is more of a hissing sound.

    Steve

  4. #3
    FRESHMAN ROVER
    Join Date
    March 1st, 2014
    Location
    Munich
    Posts
    148

    Re: RRS p400e disturbing sound

    Quote Originally Posted by Johan1972 View Post
    I have my RRS p400e since dec.2018 and I have a disturbing sound in the car.
    I suspect it's from the air compressor of air suspension.
    Every time this one goes on/off, I hear a knocking sound on the speakers ( I think)
    The RR dealer says they've already more complaints, but there is nothing they can do about it.
    Is this normal for a €100000 car?
    Are people here with the same problem?
    I've already complained to the importer, but never get a response...

    Thanks
    Johan
    My P400e arrived August 18 and I already drove it 32.000 km.
    I Never had any knocking sound on the speakers.

    My „disturbing sound“ is the engine on higher speeds at Highways...

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  6. #4
    FRESHMAN ROVER
    Join Date
    June 5th, 2018
    Posts
    153

    Re: RRS p400e disturbing sound

    You might try turning off the stereo for a period typically experienced when you hear the sound. If the sound is no longer present, you might be experiencing electrical noise from the compressor. If that is the case, you might try installing an electrolytic capacitor across the compressor terminals. Make sure the + on the capacitor goes on the positive lead of the compressor. If the noise is from the compressor, it is "spiking" the electrical system, which is being picked up by the closest speaker to the compressor. The capacitor will short the "spike" to ground. Capacitors appear as a short to AC, and an open to DC, which is all the power supplies should be supplying to the systems. You might also try tightening any and all grounds in the vehicle you can find, as a loose one could cause the "pop." Ray

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