Tang Band Sub Woofer

[robertburmeister]

I have been looking at the Tang Band 8" 740c that PE had for $40 for use as a computer speaker system sub. I would like to build a sealed box, but, I don't know if it is suitable for that. I have never built a sub project before. Thanks for any info you can give me. If it will not work, we will go with one of the Dayton subs.

[AJ]

Download winisd from linearteam.org. It is a design program for modeling the effects of enclosures. In the beta version (don't get the pro ver.) all you need to enter for specs. is qts, fs, and vas.

[hulan]

I haven't modeled that one, but I think it may be hard to get a deep frequency response in a sealed configuration. May be best used ported in most circumstances.

[aduncan]

I have that sub in a .5 cubic ft sealed box. The amp is a 150watt amp I got from MCM, which has a 5db boost at 35Hz. The setup is impressive considering how little cash I put into it. The sub goes suprisingly deep for a sealed 8" and can put out plenty of volume for a computer setup. I'm using the sub for my main home theater at the moment and I've been impressing most everyone who's heard it.

The sub isn't perfect though. The excursion during very low bass hits is insane and I've had the sub distort on me at high volumes. If I had it to do again, I would probably do a passive radiator and a heftier amp. But I'm still happy with how this project turned out, and I'll take my sweet time until making another sub because this one is doing the trick so nicely.

A ported design with this sub is hard since to get a manageable port length, you need a large box, and then you've defeated the purpose of getting an 8" to work in a small box.

Another warning is that that sub's magnet has a pretty large field. Make sure it's far off from your computer system. I got heavy TV discoloration with that sub at close as 3'.

> I have been looking at the Tang Band 8"
> 740c that PE had for $40 for use as a
> computer speaker system sub. I would like to
> build a sealed box, but, I don't know if it
> is suitable for that. I have never built a
> sub project before. Thanks for any info you
> can give me. If it will not work, we will go
> with one of the Dayton subs.