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Car amplified speakers...massive bang...

I currently changed my car radio, origionally had alpine head unit,worked fine with 800watt fly amp, supplying 2 vibe speakers!!now that i had changed radio, when i turn the radio on....i hear a scary loud bang from the speakers, after bang they work fine, and also when i turn off the radio, it makes a really loud bang or thud from the speakers!!what could be the cause and how do i fix this before my speakers blow man

Cheers Jay

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  • Jay2412 Apr 20, 2009

    instead of making a delay circuit board....would it be possible to integrate a switch on the amps remote wire...an turn the switch off before the radio...if that would be possible it would be good,because then i would have the choice of turning on/off the speakers

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This kind of problem is often caused by transients in the signal
processor as it powers down finding their way into the signal path,
which the amplifier then transmits to the speakers.

Usually this can be solved by adding a little turn-off delay to the
processor. This allows the processor to stay powered on for a short
time after the amplifiers have powered down, thus preventing the pop.

Many components sold today (such as crossovers, equalizers, etc) have
delays built-in. Read your manual to see if it is possible to set this
delay on your piece of equipment or be sure to look for this feature
during your next car audio purchase.

If your processor does not have this feature, you can build your own
delay circuit with a diode and a capacitor. Add a 1N4004 diode in
series with the processor's turn-on lead, striped side towards the EQ.
Then add a capacitor in parallel, the (+) side of the cap connects to
the striped (processor) side of the diode, the (-) side of the cap goes
to ground (not the radio or EQ chassis - connect to the car chassis).

Experimenting with the cap value will give you the right amount of delay
before the EQ shuts off. You don't want it too long, just long enough to
make sure the amp is off before the EQ powers down. 220 - 1000 uF is
about right, and make sure the cap is a polarized electrolytic, 16V or
higher. Also keep in mind that the diode will introduce a 0.7V drop on
the remote wire, which can cause the processor to power down before the
rest of the system.

Posted on Apr 20, 2009

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