View Full Version : Sealed Box question
01-09-2008, 02:02 PM
I am making a sealed box for my 12" Type R and have a question. The box is ~0.95 cu. ft. gross (0.88 cu. ft. net) volume, slanted where the sub will mount, 14" wide x 14" deep x 14" tall side/10" short side. It will be run by a Cadence TXA-750D (600w RMS / 1200w Max) running at 1ohm (dual 2ohm sub). My goal is very much SQ.
I have heard that it is a decent idea to put some sort of foam on the inside of these boxes opposite the speaker. Should I put some Ensolite foam on the back panel? Or will this take away from the performance/"reduce" the enclosure volume like polyfill does?
01-09-2008, 06:05 PM
Since when does polyfil reduce enclosure volume or hurt performance? Polyfil will lower the alignment (like a larger box does) and will reduce upper order harmonics' standing waves. The foam will help with it as well but the difference is slight.
My goal is very much SQ.
May I ask why you went with a Type R, then?
I can think of a bunch of other drivers that are that price or cheaper that'll sound better in a sealed environment...
01-09-2008, 07:07 PM
I have heard that Polyfil simulates reducing the size of a box. I will have to check my sources a bit better next time. But since I have a few square feet of Ensolite left, I will use some inside this box.
Jim, I haven't built a box or system or anything before, so I went on price and some basic reviews. Could you make some suggestions?
01-09-2008, 07:09 PM
Polyfill does exactly the opposite, it simulates a larger enclosure. It is used primarily when box size is kept small due to space issues, or preference.
01-10-2008, 12:25 AM
type R, SQ, :crazy:
01-10-2008, 02:49 AM
I would personally sell the sub and go a different route if you are truely looking for SQ, and want to be happy when its all said and done
01-10-2008, 02:53 AM
polyfil makes a box "seem" 10-20% larger its good if u accidentally made box too small or have limited space
01-10-2008, 01:35 PM
To all that say "get something else" - make suggestions! I am not looking to spend a ton of money on this thing, I think this sub was $112 shipped. So, suggest something for either 375w at 2ohm or 600w at 1ohm.
01-10-2008, 01:59 PM
Try the Dayton RS series.