Subwoofer maintenance

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Bill Fitzmaurice
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Re: Subwoofer maintenance

#16 Post by Bill Fitzmaurice » Sat Aug 13, 2016 10:00 am

MA043HA wrote: On page 16 of my THTLP plans it says "Install and wire the driver; lock washers are a must, or the screws will vibrate loose"
That's an artifact from a previous version, before tnuts and bolts were relegated to the dust bin. :bash:

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eshadeol
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Joined: Fri Mar 30, 2012 12:07 am
Location: Phoenix Arizona downtown district

Re: Subwoofer maintenance

#17 Post by eshadeol » Tue Oct 04, 2016 9:23 pm

Rich4349 wrote:I've had the same issue, and noticed they last time I cracked open my t-60s that the speaker gasket had compressed- to essentially nothing, maybe 1 mm! So one at a time I removed the bolts and put a tiny dab of blue (weaker) loctite on the last 3 or so threads, then tightened them down. I guess I'll see how that worked the next time I crack em open.


I'll be trying the same thing, because I noticed a drop in the 25hz mostly lower gut feeling and the 35hz region, on a particular song I know well. I took one apart today, and sure enough most bolts are loose.

It's been 3yrs since building these , I can't wait to see what the 4yr old pair will be like after I pull off the access cover. I think I would have been fine with screws, but,, I will use a very small amount of blue locktite on 1/4 of the lowest threads, star gripping washer, and a spring loaded washer. Btw I had lock washers,, maybe the lock washers make it easier for ,,, NO that can't be right. The lock washers definitely prevent loosening. ALSO , I WD40'd the heck out of the hurricane nuts (threads only) and the allen headed bolts threads before because they wouldn't go in easy, even though the alignment between subwoofer panel and rear driver basket circumference, and hurricane nuts was superb.

Eventually the gasket will compress more, but it still beats the purchase of a $2,500 dollar speaker X*4 and being worried about scratches, drops , or unintentional damage.

You'd have to expect that all the vibration going on inside that subwoofer chamber with no engineering like that of vehicle's shock absorbers, motor mounts , etc. , that this is only a subwoofer with a well made gasket that has did its job pretty well considering the circumstances. I even feel like putting one one access panel of aluminum to dissipate the heat since I only use them once the weather gets cooler. Then putting some velcro around the parameter of the aluminum cover so I can attach a Styrofoam = R-value secondary cover so the heat from the summer months doesn't migrate readily into the driver chamber.

I just pulled the 3yr old pair out today
Edit: sorry for the bold text boss!
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Defy the vortex -of mediocre-second rate bass- produced by mongrels- devoid of taste!
A beautiful lyric from : Maggotron "In Search of a Funky Khan"
4 T60 27" lab15,Omni TB 2 BP102,AutoTubaMCM 10"

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eshadeol
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Joined: Fri Mar 30, 2012 12:07 am
Location: Phoenix Arizona downtown district

Re: Subwoofer maintenance

#18 Post by eshadeol » Tue Oct 04, 2016 11:07 pm

Got some sealant inside that wouldn't off gas.

Now checking- seems as though only three bolts loose out of eight 3/8 , not too bad. I'll mark them with a florescent pen and check back in a year or two after I tighten them all down and seal it back up. I'm not even going to try and make it look pretty on the inside. That was wipe off from my glove and it's holding strong. Alex Acrylic Latex around bolts , so air doesn't leak through the threads. Because with the stethoscope (hose) I was able to hear air leaking through a few of the bolts, during my first test run 3yrs ago.

Actually I think I'm going to stay with bolts and maintain these speakers this way for their or my life ,WhichECFirst. I'll see how the issue or not arises after a very conservative amount of locktite assists in reducing bolts vibrating loose.
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Also this very helpful tool from Parts Express sure does pick at the few buyers of latex caulk that might be in the hex heads . Only three on my part , and the buyers came off in one piece , maybe because of the grease WD40.
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Defy the vortex -of mediocre-second rate bass- produced by mongrels- devoid of taste!
A beautiful lyric from : Maggotron "In Search of a Funky Khan"
4 T60 27" lab15,Omni TB 2 BP102,AutoTubaMCM 10"

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