Building my first subwoofer (1 Viewer)

[Williams16]

Hello, this is a great site and good people around. I´m interested in doing my own subwoofer. I want to practice because I have two speaker of 12" and a 17". First I want to begin with the two 12". This isn´t a new driver (150 watts max), it is old and was set in a 67.2L box for 40Hz without any information ( fb,Q,etc). This is all I have.

I want to practice with this drivers first but I want it sound around 20Hz, and I want an aproximation of the volume for the box and the vent lengh.

I know it could sound bad, but is all I have and I will not spend money in a great sub without having experience building boxes.

Also I want to learn more, I will acept any help and recomendations. Thankss

 

[Brent_S]

Unfortunately, without the T/S parameters for your current drivers, there's nothing to base a design on. If your 12" driver is tuned to 40hz or has a 40hz cutoff (not clear from your note), more than likely, that driver is not capable of usable response down to 20hz, even if you knew the T/S parameters.

Some good placed to start learning about DIY would be:
http://ldsg.snippets.org/idx.php3
http://www.diysubwoofers.org/
http://www.partsexpress.com/resource...ide/index.html

-Brent

 

[Dave Poehlman]

Brent's right.. without more specifics.. it's hard to say what size box would work best.

However, if you're mainly looking for box-building experience.. you might want to rebuild the existing box. Chances are, rebuilding the existing box with better materials (ie: MDF) would probably yeild some improvement. And get you some experience making boxes. You could also experiment with box dimensions, amount of stuffing, driver alignment (downfiring, frontfiring) and port location (front, back) to compare it to its original.

Are the 12" drivers in a subwoofer enclosure now or are they part of a pair of speakers?

Either way, you probably don't want to venture too far from the existing enclosure size when turning them into a subwoofer (unless you're combining them into one enclosure.. where you'd combine the volume of both into one).

Welcome aboard, and keep us posted with what you come up with.