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Old 27 Dec 2004, 02:18 am
mmdir2002@yahoo.co.uk
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Default Noise from New amp


I got a x-mas present, a 500W amp. I installed as two channels
amp in rear of my car. I hear a noise like a hissing. It's constant
hissing sound no matter which volum I play the car audio.
I did check out the all the wire. I'm not sure if the hissing
is coming from the car stereo or from the new amp. Is there way
to filter out the hissing noise?

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  #2 (permalink)  
Old 27 Dec 2004, 11:32 am
jim beam
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Default Re: Noise from New amp

mmdir2002@yahoo.co.uk wrote:
> I got a x-mas present, a 500W amp. I installed as two channels
> amp in rear of my car. I hear a noise like a hissing. It's constant
> hissing sound no matter which volum I play the car audio.
> I did check out the all the wire. I'm not sure if the hissing
> is coming from the car stereo or from the new amp. Is there way
> to filter out the hissing noise?


if it's constant volume, it's not the fault of the existing stereo. if
it's affected by engine rpm, or goes away when the engine's not running,
it's picking up noise from the power supply. that's fixable, but at
additional cost. if not power supply noise, disconnect the input at the
amp end - if hissing is still present, it's definitely the amp. if it
goes away, obviously, the amp's ok so it's noise pickup from the cables
that run from the existing stereo to the amp. your only option then is
screened cable. chances are, you're already using that.


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  #3 (permalink)  
Old 27 Dec 2004, 05:17 pm
RemcoW
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Default Re: Noise from New amp


"jim beam" <nospam@example.net> wrote in message
news:nomdnU-jKqSPpE3cRVn-hA@comcast.com...
> mmdir2002@yahoo.co.uk wrote:
> > I got a x-mas present, a 500W amp. I installed as two channels
> > amp in rear of my car. I hear a noise like a hissing. It's constant
> > hissing sound no matter which volum I play the car audio.
> > I did check out the all the wire. I'm not sure if the hissing
> > is coming from the car stereo or from the new amp. Is there way
> > to filter out the hissing noise?

>
> if it's constant volume, it's not the fault of the existing stereo. if
> it's affected by engine rpm, or goes away when the engine's not running,
> it's picking up noise from the power supply. that's fixable, but at
> additional cost. if not power supply noise, disconnect the input at the
> amp end - if hissing is still present, it's definitely the amp. if it
> goes away, obviously, the amp's ok so it's noise pickup from the cables
> that run from the existing stereo to the amp. your only option then is
> screened cable. chances are, you're already using that.
>


Jim's right on the money with his analysis. Following his instructions and
it will help you find the cause.

It it ends up going away when you unplug the stereo, it could be a grounding
problem of sorts. If your radio and amp are grounded at different points,
you could have what's referred to as a ground loop. Try tying the amp at the
same power leg as the radio (both power and ground) to see if it goes away.

If unplugging the radio doesn't help, you could try to move the power to the
amp closer to the battery (ideally, on the battery posts but that may not be
convenient).
Before you do all that, you may want to make sure that the hiss doesn't come
from the amp -- just get a separate supply (another battery, if you have
one) and see if hooking the amp's power just to that battery and nothing
else helps at all. It could be inherent of the design, but I'd exchange your
amp to make sure.

If moving the wires, etc, does not work and the problem is not within your
amp, you could try a radio shack noise filter (Catalog #: 270-051). I don't
think it will be able to handle the full input power to your amplifier,
though, as they are rated at 10amp - check your specsheet.


Hope this is useful.
Remco


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  #4 (permalink)  
Old 28 Dec 2004, 12:39 pm
Da_Jatt
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Default Re: Noise from New amp

Problem can be fixed easily by adding a floating ground available at any
audio shop or Best Buy.

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