To do what? Adding mass without adding rigidity lowers potential panel resonance frequencies, making them more likely to be excited, and more likely to be heard.
In a woofer it is very counter to killing resonances or more significantly, not excited if you can get any potential pabnel resonances above the bandwidth of the driver in the box.
dave
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Both what?
In a sub or woofer in particualr, buitumin, is counter-productive. A waste of time and money.
dave
In a sub or woofer in particualr, buitumin, is counter-productive. A waste of time and money.
dave
Damping material effectiveness is proportional to its density. So light fluffy stuff, low density, is ineffective. Heavy rock wool or densely packed fiberglass is very effective. Adding that dense stuffing effectively makes the box volume look larger to the woofer, so that can extend the low end while also lowering the in box Q. Nice looking build. I looked at using that woofer. It has great specifications.
This SB Acoustics driver (SW26DAC76) is indeed a pretty good 10"er. The shallow basket, light weight, and neodymium magnet make it easy to work with, but it still performs extremely well. A bit on the expensive side tho.
Interesting. Does that put it in a state of outward pressure on the box when is idle/off? And do you find that applied pressure further damps resonance in the panels?
It's just two bolts, one drilled and tapped to take the smaller one, the opposing ends turned to points (to locate in centre drilled holes, already in the speaker magnets) and with a lock nut to stop them from working lose. They push the speaker drivers outward against the speaker enclosure, but I'm only using a 3 watts amp to drive them, so they don't have to be pushed very hard. I am tempted to use soft foam gaskets between the rivers and enclosure, meaning the drivers would "float", and be machanicaly isolated form the enclosure, however I don't think that that's necessary because the thin wall/well braced enclosure has a resonant frequency too far above the range of the sub to be "excited" by it. I'll try and take a picture if we get some sun.
It was about 40years ago and I bought a 2.5kg can for a few £s.
I spread it on with a palette knife and then left the box opened without the drivers fitted for a couple of weeks for the solvent to evapoarate.
Years later I used a lead/foam sandwich from noisekiller.
https://www.nkgroup.co.uk › noisekiller
This completely blocks anything from reaching the walls but is heavy, (obviously)
I used it to silence my boat engine - what a massive difference it made.
I spread it on with a palette knife and then left the box opened without the drivers fitted for a couple of weeks for the solvent to evapoarate.
Years later I used a lead/foam sandwich from noisekiller.
https://www.nkgroup.co.uk › noisekiller
This completely blocks anything from reaching the walls but is heavy, (obviously)
I used it to silence my boat engine - what a massive difference it made.
Hmmm, that could yield a nice, warm sound, no?
🤣
Actually the blanket idea is interesting, as I'd think it would "settle" less over time (??).
Where did you get that, if you remember?
It was packed around a medical shipment. An Auvi-Q epinephrine/ epipen device.
FrostKing also sells denim insulation. I picked up that as well to stuff my speakers better.