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Author Topic: does polyfill increase spl?
uscoastie
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i have the 15" kicker L7's in a sealed box with 2.5 cuft each, and i was reading in the manual that i should put poly fill in. will that increase my spl or reduce it? if so, how much should i put in it? thanks
Posts: 11 | From: miami | Registered: Nov 2007  |  IP: Logged | Report this post to a Moderator
Wanna-B-Basshead
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never used it

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Travis Atherton
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quad box
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it will give you a little better low end it tricks the sub into thinking it's in a larger box [Wink]

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thanosdbfan
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I used to have my 2 12sL7 Ver.1 in sealed boxes filled with polyfill (in a 26 lt. (almost 1 cu.ft))box each

Removing it gained 2+ dbs (from 148 to 150.1)

OLD TERMLAB sensor...

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Posts: 239 | From: ATHENS GREECE | Registered: Oct 2003  |  IP: Logged | Report this post to a Moderator
D-Bass
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adding polyfill at a moderate density will reduce spl, but widen the low-end response.
The fill degrades the acoustic energy from the backwave into thermal energy in the fibers. By disappating the energy, it reduces the pressure increase, which is how the box "acts" like its got more volume. There is then less restoring force on the forward stroke from x-, reducing efficiency.

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Posts: 3269 | From: Columbus, OH - formerly FL | Registered: Oct 2003  |  IP: Logged | Report this post to a Moderator
   

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