Sealed Box question

[unclesam099]

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?

Thanks.

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[Immacomputer 10+ year member]

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.

 

[JimJ 5,000+ posts]

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...

 

[unclesam099]

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?

 

[ultimate157 5,000+ posts]

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.

 

[BrianChia 10+ year member]

type R, SQ, //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

 

[btdickey99 5,000+ posts]

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

 

[memphis_vette 10+ year member]

polyfil makes a box "seem" 10-20% larger its good if u accidentally made box too small or have limited space

 

[unclesam099]

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.

 

[BrianChia 10+ year member]

Try the Dayton RS series.