twk123 Posted November 4, 2015 Share Posted November 4, 2015 I bought a MWF-15 sub with a blown amp a while back for $60 and hooked it up to a Dayton 250W plate amp. Anyway today I turned up some Electronic music and suddenly the sub started to make a horrible clunking/grinding noise so I turned it down immediately. The output now appears to be less and if I turn it up it makes the horrible noise again. If I press in on the woofer I can hear it scraping etc. The original amp is 350 W and I have tried to be good about not maxing out my Dayton 250 W. I have no gain set on my receiver but do you guys think I clipped the amp which caused the driver damage? Also, do you think its worth to try to repair it or drop in something like at Dayton Reference 15'' HF? Thanks for your help in advance, its a bummer but a learning lesson. Quote Link to comment Share on other sites More sharing options...
ricktate Posted November 4, 2015 Share Posted November 4, 2015 Sounds like woofer is toast. Can be fixed not sure how much. Getting a Dayton woofer probably cheaper. Rick 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 4, 2015 Share Posted November 4, 2015 If I press in on the woofer I can hear it scraping etc. Fried the voice coil which is odd considering the amp you were using. Quote Link to comment Share on other sites More sharing options...
jjptkd Posted November 4, 2015 Share Posted November 4, 2015 That really sucks! It's possible that when the old plate blew up it sent a surge to the woofer and damaged it making it weak and ready to blow. If you have someone local who can re-cone the driver that would probably be the cheapest fix. Good luck! 2 Quote Link to comment Share on other sites More sharing options...
wvu80 Posted November 4, 2015 Share Posted November 4, 2015 If I press in on the woofer I can hear it scraping etc. Fried the voice coil which is odd considering the amp you were using. The original amp was blown also. I'm guessing the driver had issues from the previous owner. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 4, 2015 Share Posted November 4, 2015 If I press in on the woofer I can hear it scraping etc. Fried the voice coil which is odd considering the amp you were using. The original amp was blown also. I'm guessing the driver had issues from the previous owner. It's still odd. The MFW's were notorious for having amp issues. Due to this and the company going out of business, there was a glut of these drivers on the market. Most people repurposed the drivers into something else. Lilmike used this driver when he designed the F-20. This is the first driver I've heard of with a fried voice coil. Hopefully his Dayton is not the issue. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 4, 2015 Share Posted November 4, 2015 Did the driver have a slight burned smell when you got it? Once they start to smoke (even slightly) it's hard not to notice the smell. Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted November 4, 2015 Share Posted November 4, 2015 I will brings some ribs to the cookout! Frankly, I would just get a new sub with a good amp. 1 Quote Link to comment Share on other sites More sharing options...
twk123 Posted November 4, 2015 Author Share Posted November 4, 2015 Did the driver have a slight burned smell when you got it? Once they start to smoke (even slightly) it's hard not to notice the smell. Not that I noticed. He had his setup in the open part of his house and upgraded to two sealed DIY 18'' subs so I am guessing it was driven pretty hard. I am not too bent out of shape as I snagged it for $60 which is pretty much what the box is worth. It still sounds decent on low volume so I am going to stick with it until I can get a Dayton replacement. My master plan was to use the driver in a Cinema F-20 but i want to wait until after i move as my LaScalas and KG 5.5's are already going to take up a good chunk of space. Can I safely run the driver as is at lower volumes or do I need to worry about Ohm fluctuations hurting the amp? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 4, 2015 Share Posted November 4, 2015 I'd hook an ohm meter up to the driver leads with the amp disconnected and push down on the cone while watching the meter. If it goes to 2 ohms or less I wouldn't use it. My gut says not to as well. Quote Link to comment Share on other sites More sharing options...
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