Question about Pioneer Car Amplifiers

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SUB PULLS IN INSTEAD OF PUSHING OUT

I HAVE A PIONEER GM-7300M HAS WORKED FINE FOR A LITTLE OVER A YEAR NOW ALL OF A SUDDEN WHEN THE BASS HITS SUB SUCKS IN INSTEAD OF PUSHING OUT AND VERY DISTORTED

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In a normal subwoofer it does pull in and push out to create the sound. It could be that the voice coil is damaged (by over excursion running it into the magnet) and it now can't push out past a certain point hence looking like it's pulling in. Push in on the woofer with your hand, do you hear a scraping sound? If so it's time for a new sub. If not, take it out of the enclosure and push out on the cone from the inside, scraping now?
Another test for loose voice coil windings that I find works is the hold the sub up close to your ear and bang on the magnet with the palm of your hand, if you hear faint rattling or anything other than a low "thud" sound then there's is some sort of mechanical failure within the woofer............also time for replacement.

If all seems good at this point, try connecting it to a different amplifier, the sub itself may be fine. If you've lost one of the amplifier rail voltages the sub will pull in but not push out...(or vice versa depending on if it's the positive or the negative power rail)......and yes, it would sound distorted.

Posted on Oct 09, 2008

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