Sealed enclosure Vs. ported box

[robertbartsch]

I'm designing some smallish cabinets that I plan to have built to hold a 15" LF and a compression HF driver and some small horn lens.

Anyway, since the speakers will serve as the front channels for my HT, they need to fit behind the TV in a moderate-sized room. The approximate demensions of the new boxes will be 18" x 26" x 15"

With such a small box, is there any advantage to using a sealed box?

Thanks...

[Hoerninger]

In general a ported box will have an extended frequency response to the lows compared to a closed box when designed properly.

When designing an enclosure the volume for a given speaker is defined under consideration of the frequency response. These calculations can easily be done by an appropriate computer program.

It is easiest to follow the manufacturers recommendations for a given speaker.
____________
Peter

[Zilch]

You've got to get down to the fundamentals. The driver parameters dictate whether it is better suited to closed or vented alignments.

In either case, there are not a lot of 15" woofers that will play competently high enough to mate with a small horn such as you suggest you'd like to use. Additionally, you're not going to get much in the way of bass out of a driver that size in so small a box.

Not that having extended bass response matters all that much in HT when used with a sub.

Also, I'm not getting what "They've got to fit behind the TV" means. Are you talking perforated screen here?

[Robh3606]

Small?? That's 4 cubic ft. Any reason they have to be 15"s??

Rob

[Robh3606]

Since poster references space available I doubt those are internal dimensions

Hello David

Didn't think they were. If you think a 4 cubic ft box is small well what can I say. Looks big to me, I have a pair sitting right in front of me. Larger than a 4425,4412,4311 and so on. L20T/4406 is small to me.

If space is at premium you can fit one hell of a lot of drivers, many in boxes smaller than that to fit the bill for acceptable lowend for HT for LRC duty with a sub. That was my point you don't need to do 4 cubic ft, you can do less and potentially still get what you want.

Hello Robert

You need to work out the efficiency and what horn you are going to use.

Rob

[Zilch]

3.16 gross internal cuft.

LE14H-3, 2452H-SL on PT-F95HF, ... done.

Well, except for the crossover....