Quote:
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Originally Posted by MNBoxster
Hi,
A line Noise Eliminator is just a Band-Aid and reduces the noise but doesn't eliminate it. It also has an adverse effect on the sound, though undetectable by some. Happy Motoring!... Jim'99
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The filter doesn't eliminate the
source of the noise, but it
does reduce or eliminate it from the power supplied on the
load side of the filter. All head units have some basic filtering in their power inputs, the noise eliminator (filter) is just a filter targeted to that characteristic alternator "whine".
The "adverse affect on sound" that MN alludes to can only be from the limitation on dynamic current swings that music will require. One of the main components of the filter is likely a large choke, (coil, inductor) that all the DC current must flow through. One of the main electrical properties of inductors is that once current is flowing through them, they resist any change in that current flow. That would limit the dynamic range of a amplifier that is attempting to drive speakers, as it takes that 12v current flow to produce the power that drives the speakers.
In xclusivecar's case, he has no worries. He retained the OEM amplifier, and since the noise filter wasn't installed in its power lead, the amplifier still has a direct source of current supply. The head unit isn't requiring any appreciable dynamic current, since the low level audio signal paths and the outputs to the amp only require a few hundred milli-amps of current (far less than 1/2 amp).
Obviously, eliminating the source of the noise is best. Until then xclusive, enjoy the new tunes!