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<blockquote data-quote="CarAudioAddict" data-source="post: 107432" data-attributes="member: 545743">I would normally agree, but he described the sound as a &quot;buzzing&quot;.Does the buzzing increase in speed as you rev the engine?If so, you are having a problem with your ignition coil creating noise in the power system (this also indicates a low quality power supply in the amplifier)If the buzzing doesn&#039;t increase in speed and is only there when the car is &quot;on&quot;, that is - the key is in the &quot;On&quot; position and not &quot;Acc&quot;, then you have a problem with your daytime running light circuit.Daytie runing circuits, on some vehicles (not all), use PWM (Pulse Width Modulation) to turn the headlights on and off 1000&#039;s of times per second - so they are dimmer and use less power than when your headlights are on. This creates a ripple in your cars power system, which can be heard through an amp as a buzzing</blockquote>

[QUOTE="CarAudioAddict, post: 107432, member: 545743"] I would normally agree, but he described the sound as a "buzzing". Does the buzzing increase in speed as you rev the engine? If so, you are having a problem with your ignition coil creating noise in the power system (this also indicates a low quality power supply in the amplifier) If the buzzing doesn't increase in speed and is only there when the car is "on", that is - the key is in the "On" position and not "Acc", then you have a problem with your daytime running light circuit. Daytie runing circuits, on some vehicles (not all), use PWM (Pulse Width Modulation) to turn the headlights on and off 1000's of times per second - so they are dimmer and use less power than when your headlights are on. This creates a ripple in your cars power system, which can be heard through an amp as a buzzing [/QUOTE]

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