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Convert Bozak Mono Speaker to Subwoofer???

My dad has an old Bozak speaker, for which he built a 44" (w), 22" (d) and 17" (h) box. The box contains a 12" woofer, a 5" midrange, and 2 tweeters mounted over the woofer. He no longer uses this speaker, but instead has two bookshelf speakers (actually sitting on bookshelves!). That's not going to change, but I was thinking about using the woofer in this Bozak to get him a little more bass extension. The idea is to purchase a subwoofer amp from Part's Express, take the signal from the preamp out or the speaker terminals of his receiver, and do whatever I can to get the sound balanced. The Bozak would sit in the corner of a rectangular room (approx 14x28), and cannot be rearranged. If necessary, we could take out the midrange and plug up the hole, just leaving the woofer in the existing box.

What do you all think. Is this potentially worth it, or does the box shape, size, and inflexibility with location make it not worthwhile. If it's worthwhile, any additional advice would be welcome! Thanks, Peter.
peter_s

Showing 2 responses by sean

sean
6,231 posts
 
That's definitely a pretty good sized box and if the driver is still in decent shape, it should be capable of good low frequency response. Is the box sealed or vented ? Sean
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sean
6,231 posts
 
I would start off by investigating the condition of the driver. If everything seems okay i.e. the driver moves freely without dragging or scraping, the surround ( foam, cloth, etc... ) is in good shape, etc.. If that all checks out, I don't see a problem with using what you already have. I would personally pull all of the other drivers out out and seal the cabinet as best possible. While you are in there, install some decent wire and connect it directly from the input jacks ( whatever they may be on the cabinet ) to the terminals of the speaker itself. In other words, bypass any / all of the existing wiring and crossover parts.

Using this as a subwoofer is actually easier on the driver since it will only have to cover a smaller portion of the band that it used to have to cover as a full fledged woofer. How great it will work or how long it will hold up as a "true" SUB-woofer is another story. I'm sure that it will more than supplement the little bookshelf's that you Dad is currently using and should be capable of pretty solid bottom end in a box that size. If the driver does not hold up ( although i see no reason that it shouldn't other than foam rot ), you can always replace it with another driver that would be more suitable for this specific application. Sean
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