Ok I bought a 15" Memphis Mojo Dual 2ohm and i had it hooked up to a Fusion 1404! subs in a 6.3 cuft box ported to 35hz. Well I took out the sub then put insulation in the box still using the same amp hooked up in 4ohm just like before! well i bought a memphis 1000D and hooked it up in 1ohm and now i have a lot of coil stink? it is cause the insulation in there or is it about to blow! the sub starts to blow out warm air after some abuse. There wasnt any coil stink with the fusion amp and now there is with this amp! it smells like weeds in ur yard and stuff! What should I do? Take out the insulation? Take the sub back? It isnt even a month old!
it could be a couple of things, 1) the sub is finally getting real power and is just breaking in, or 2)the amp is clipping like h3ll and causeing the vc to get hot, which isn't good. and why did you add insulation, that makes the box seem bigger, but you allready have a huge box a lot bigger than recommened.
Enclosure sizes: Poly-fill can be used to make an enclosure seem slightly larger. It does this by slowing the movement of the air in the enclosure. This, in effect, smoothes the frequency response of the subwoofer's output and slightly improves its low frequency extension. The effect is not very dramatic but using poly-fill in this manner can sometimes make a subwoofer sound better. 100% fill is equal to 1 pound of poly-fill per cubic foot of air space.
Standing Waves: Standing waves are not usually a big problem in a subwoofer because it is usually crossed over. In other situations, like home speakers, poly-fill can be used to damp standing waves. In home speakers, the woofer is often used to reproduce a wider frequency range than it would be in a subwoofer. This creates the opportunity for standing waves to create problems. The wavelength is too long in the lowest frequencies to cause a problem but frequencies above 300 or 400hz will start to cause problems. This is especially true in ported boxes because the port creates a conduit through which the higher frequencies can pass (from the inside of the enclosure). _____________
If you add 1lb of poly fill for every cubic foot of space, your subwoofer will act like the box is 1/3 bigger.
well actually memphis reccomends atleast 6.0cuft and i seen peeps with the mojo in a 7.5cuft box and i didnt really want to lose my back window! so to answer everys question insulation and polyfill trick the subwoofer into thinking it is ina bigger box so it hits low notes harder! i dont blv i am clipping the amp! the smell is starting to go away! only does it on LOW songs!
Poly fill isn't really meant to be used in ported enclosures...I've seen it used in some home audio speakers (old pair of 80's Realistic Nova-15's), and they sounded great.
But in reality, if the box is built and tuned correctly then the need for poly fill isn't there.
It's really for sealed enclosures to make them seem "bigger" to add to your dB output. However, after adding so much poly fill to a sealed enclosure, the jump in dB output, will eventually just level out and not increase anymore.