can't tighten all screws, getting some distortion

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BC Dave

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can't tighten all screws, getting some distortion
« on: 12 Oct 2006, 12:01 am »
Hello,

I purchased a 1991 VMPS Original sub a few months back and then upgraded to a 12-inch Megawoofer and new passive radiator. I noticed a couple of the screws (one on the woofer, the other on the PR) were stripped but everything sounded fine. Now I am hearing a little distortion on material such as the opening THX sweep at the start of movies. This is at a healthy, but hardly woofer-stressing loudness level. I have a Rotel power amp bridged to 300 watts and I am surely not clipping it. Could the two loose screws be the culprit? If so, what's the best way to fix this problem (liquid wood?) I did not hear this distortion (sort of a fluttering) when I first replaced the woofer and PR. Thanks in advance.

Brian Cheney

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Re: can't tighten all screws, getting some distortion
« Reply #1 on: 12 Oct 2006, 12:26 am »
Isolate the problem to either the active or passive, then contact us for replacement.  Make new screw holes for the drivers by rotating them an inch or two.

warnerwh

Re: can't tighten all screws, getting some distortion
« Reply #2 on: 12 Oct 2006, 04:36 am »
I seriously doubt one screw being stripped would affect anything. The reason I say this is because on both of my RM 40's each of the passive radiators have one screw stripped and it's not affecting the sound at all. I can assure you I have alot of power and push them sometimes with very bass heavy material and the bass is the best I've ever heard on any system. Other people have also told me it's of the best they've heard.

One thing to make sure is that when you changed out drivers that the wires aren't any where near the back of the drivers. On another pair of speakers I had one of the wires were just barely able to reach the back of the woofer on strong bass notes and it was driving me nuts. Moved the wires an inch and all was well.

The Megawoofers are very robust. Drive them hard, assuming the amp isn't clipping, and they'll take it in stride. I don't know what it would take to damage one but it would take a bare minimum of several hundred watts under just the right circumstances. Maybe even a thousand watts or more, yes I'm serious. I know this as I've owned very high powered amps driven to very high levels, well over 100db at my listening position, and have not damaged one.