Questions about box design.

[ultimate157 5,000+ posts]

I'm gonna be building a box for my Eclipse 8200 soon, and I'm trying to decide on the box size, etc.

I'll be powering it with a BASH 500w amp. Thinking of a box size around 2.5 to 3 cubes sealed.

Since the motor has a pole vent, I was thinking 2" from the rear would be sufficient.

When adding egg crate foam, does it have the same effect as polyfill? As in adding layers around the walls won't subtract from the volume, but slightly add to it (acoustically, of course.) Correct?

Also, most HT subs I see are down firing. Is there any benefit to doing a down firing than an out-firing sub?

Thanks,

Matt.

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[BrianChia 10+ year member]

Downfiring allows you to load off the floor giving a similar effect to a subtle bass boost you might experience from firing towards a corner, but IMO it can affect linearity, sound quality, and driver suspension (in the long term). Many cheap HTIB type systems employ down-fring for the bass boost effect but please note that the majority of high end musical subwoofers are front firing.

 

[ultimate157 5,000+ posts]

Downfiring allows you to load off the floor giving a similar effect to a subtle bass boost you might experience from firing towards a corner, but IMO it can affect linearity, sound quality, and driver suspension (in the long term). Many cheap HTIB type systems employ down-fring for the bass boost effect but please note that the majority of high end musical subwoofers are front firing.

That's what I figured was the reason. More "output" for the $.

So if I was looking at between 2.5 to 3 cubes sealed, 2.75 with egg crate foam lining would be a good solution to the box size?