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Alembic Club » Miscellaneous » Archive: 2006 » Archive through September 15, 2006 » Vibrating/rattling QSC « Previous Next »

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Intermediate Member
Username: george_wright

Post Number: 103
Registered: 3-2005
Posted on Wednesday, August 23, 2006 - 7:01 pm:   Edit Post

I have a QSC RMX2450. It's all alone in a Gator two-space rack, with rear rack-ears installed. The amp rack sits on top of an Acme B4 and under a Gator six-space rack with other electronic toys in it.

Any notes on the B or E string at any appreciable volume cause the face plate of the QSC to vibrate loudly. I can eliminate the rattle by pressing on the face-plate between the on/off switch and the fan exhaust grille.

I've ruled out vibrating latches---it's the amp faceplate.

A layer of bubble-wrap between the amp rack and the cab raises the volume level necessary to cause the vibration, but this isn't a practical fix. The vibration still occurs at anything above bedroom practice volume.

So.... Two questions.

First, is this common with QSC RMX's, or do I have a lemon?

Second, are PLX and PLX2 models (which, as far as I can tell from pictures, have a much beefier face plate) less likely to vibrate in the face plate?

(Cross-posted to talkbass.) TIA
Senior Member
Username: jacko

Post Number: 781
Registered: 10-2002
Posted on Friday, August 25, 2006 - 3:35 am:   Edit Post

My PLX faceplate doesn't rattle but, when I first got it there was a rattle from inside. I eventually traced it to the fittings that held the circuit board in place - it was as if the board was made from a slightly thinner material if you get what I mean. I've 'fixed' this by putting blobs of epoxy on the board/fitting which has removed all rattles.

Intermediate Member
Username: george_wright

Post Number: 104
Registered: 3-2005
Posted on Friday, August 25, 2006 - 3:08 pm:   Edit Post

Thanks, Graeme. I'll unmount the amp from the rack over the weekend and check it out.
Username: davehouck

Post Number: 4331
Registered: 5-2002
Posted on Saturday, August 26, 2006 - 11:34 am:   Edit Post

At one point I had a rattle with my PLX. However, I no longer put my amp on top of my speaker cabs, and thus no longer have a rattle.

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