Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
User status: Offline
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ive got my genesis p2 amp powering my mids on me shelf, but when i put the fuses bk into the amp 4 the sub i instantly get bad interferance in the mids. but if i remove the fuse 4 the sub amp it goes???
whats me problem ne 1??
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DIGGIDY
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Registered: 15th Apr 03
Location: Bristol
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Is it constant interferance?? at low volume as well as high?
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Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
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yea, it increases pitch with engine revs
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TOMAS
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Registered: 7th Aug 02
Location: Nottinghamshire
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Ground loop, are they grounded both at the same point and is it a good solid ground?
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Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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if you dont want to bother rewiring, buy a ground loop isolator that connects to the power instead of RCA leads, that'll sort u out. Theres one on ma floor somewhere
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Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
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ya wanna send me it then?? so its 1 that connects 2 the power lead rather than the rca yea??
yes the earths r in same place.
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Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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its goin in me car lolol.
Yup you bolt it onto the cars chassis and connect it to live.
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Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
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so y is the problem being caused?? id rather sort it out if its possible
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Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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its more than likely the power cable for your sub picking up interference and bringing it to the amp for the mids.
Its gotta be a ground loop, so check the ground for your sub (again) and make sure its clean and tidy.
If not, a ground loop isolater is the easiest solution, instead of rewiring the entire system, which may not even work.
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Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
User status: Offline
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where can i get one from?? how much r they?
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
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£2.99 from motor world or halfords.
Ask for a ground loop isolator or a interference supressor.
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline
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if u dont get hold of one, oootoouuu me.
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timmeee
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Registered: 29th May 03
Location: s yorks
User status: Offline
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I didnt think it was possible for a power wire to pick up interference. Power leads create (magnetic fields)interference which the RCA leads pickup through cross-talk
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DIGGIDY
Member
Registered: 15th Apr 03
Location: Bristol
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the power wire is not picking up the interferance... it's generating it through the bad connection...
it works like this... if you got an old transitor radio and put it next to a high voltage source which was properly connected... chances are you will hear a little interferance... now take your radio and stick it next to a arch welder while in use and it will probable blow it to bits with the amount of interferance it generates because of the bad connection (the arch) between the materials being welded. 
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Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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Well it still picks up interference somehow, because i upgraded my earth strap and alternator earth/live and made sure that all connections were clean (my earths were bolted onto an area that was perfect by using wire wool and a sander). I upgraded my battery terminals, and my earth in the boot is bolted down in the wheel well (once again sanded and cleaned with wire wool/brush). All connections are good on my amps, and my headunit also has an upgraded live and earth all to good points.
Yet, i was still getting interference. So i fitted this little dooverie and poof! Interference gone!
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DIGGIDY
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Registered: 15th Apr 03
Location: Bristol
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I imagine a small amount of interferance could and would be transmitted thru the power wire, but this should be suppressed by the amp to a certain degree... all depends on the quality of the amp.. even good ones produce interferance sometimes..
it's not a perfect world... 
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Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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Was even happening on a Pheonix Gold QX2100 and a Alpine 4 channel, cant remember the model lol i had it for like a week before i sent it back
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DIGGIDY
Member
Registered: 15th Apr 03
Location: Bristol
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I would say there's something under your bonnet generating a substantial signal through your bodywork... may be worth checking out all the earthing point from the engine, battery or anything that earths to the body... make sure there are good solid connections...
you may never find it, but worth a try...
i've never had a problem with interferenace at all... just lucky i guess..
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
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i think it may be a faulty alternator my side generating the signal. Its quite an old but uprated one.
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timmeee
Member
Registered: 29th May 03
Location: s yorks
User status: Offline
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I think ive got it. To supply a large amp with enough power you need decent gauge cable, if the cable connections or earth is weak then the amp can only effectively use the amount of power it recieves. e.g a 1000w amp reciecing 400w supply will make 400w of good sound production, the other 600w will be heat, distortion, bad sound??
What do you guys think?
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
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Um, no.
My amp has 0 gauge cable, plenty enough for 1000rms
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Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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And even when its on its lowest level, you can still hear the interference.
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someone
Member
Registered: 13th Aug 02
Location: Surrey
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yeah I got same problem constant humming sort of noise when engine is on. same level as when volume is up or down.
got to find mine when i have a spare mo.
good place to check is the rcas too as if they are not problery they can cause this as the shielding on the rcas are earth.
you then could compare the earths around the car.
much better to find the source of the problem.
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