wsu99999 Posted August 10, 2008 Share Posted August 10, 2008 I recently picked up 2 identical subwoofers (M&K VX-4's). One of them is fine, the other only hit's at about 1/4 of the good one. All wiring outside the box is fine, so it would have to be something internally. Does anyone know what I should check? Acoustically, the low powered sub sounds fine, it just doesn't get enough power running to it. If I turn up the sw settings in my receiver I can get the sw working, but since I'm running 2, that isnt an option. any ideas? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted August 11, 2008 Share Posted August 11, 2008 You have the luxury of having one properly working sub to use for diagnostic purposes. It should be a breeze to figure out. Just start swapping components till the problem moves to the good sub and you have your culpret. Start with the parts that are easiest to access. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted August 11, 2008 Share Posted August 11, 2008 One other thought. How exactly do you have them connected to the receiver. I might try swapping connections first to see if it is the sub itself or a signal issue to the sub. Quote Link to comment Share on other sites More sharing options...
wsu99999 Posted August 11, 2008 Author Share Posted August 11, 2008 No, it's definately something with the sub and not the way it's hooked up to the receiver. So are you talking about swapping transitors and stuff on the amp or just swapping the amp and stuff? Quote Link to comment Share on other sites More sharing options...
TNRabbit Posted August 11, 2008 Share Posted August 11, 2008 First, before you remove anything, check if both subs have the same resistance. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted August 11, 2008 Share Posted August 11, 2008 No, it's definately something with the sub and not the way it's hooked up to the receiver. So are you talking about swapping transitors and stuff on the amp or just swapping the amp and stuff? No, the amp itself and possibly the driver. As previously pointed out, you can check the resistance on the voice coils of the driver. If there is a big difference from one to the other than you've found your problem. It's nice to have a properly working unit to compare things to. BE SURE YOU'RE UNPLUGGED! Quote Link to comment Share on other sites More sharing options...
wsu99999 Posted August 11, 2008 Author Share Posted August 11, 2008 I'm fairly technical, but I've never used a multimeter before. Can you walk me thru it and tell me which one I should get and how to test it? Cheapest one radio shack makes that will work would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted August 12, 2008 Share Posted August 12, 2008 Any meter should work. Just put it on the "Ohms" setting, disconnect the wires from the driver and put a lead on each terminal of the driver to measure impedance. Quote Link to comment Share on other sites More sharing options...
wsu99999 Posted September 3, 2008 Author Share Posted September 3, 2008 Well, it's definately something to do with the plate amp. I don't know what the deal is, but it's like the amp is only going at about 50% power or so. Does anyone know anywhere to get a dirt cheap 50wpc plate amp? I'm talking 25-50 bucks? I really can't spend much more than that because I just can't justify it to myself. If I were to pay more than that, I would just get a 500w one and start from scratch. Let me know -I've already looked at parts express and wanted to see if there was somewhere I could go used - Ebay is no help. Thansk, Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 3, 2008 Share Posted September 3, 2008 http://cgi.ebay.com/Dayton-plate-subwoofer-amplifier_W0QQitemZ190247888425QQcmdZViewItem?hash=item190247888425&_trkparms=72%3A552%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14 Quote Link to comment Share on other sites More sharing options...
wsu99999 Posted September 3, 2008 Author Share Posted September 3, 2008 Thanks, I saw that one and I'm watchin it Quote Link to comment Share on other sites More sharing options...
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