Archived from groups: rec.audio.tech (More info?
Hugo Lalumiere wrote:
> I have a pair of Technics SB-3130 bookshelf speakers, three way, with
> woofer, one paper cone mid and one aluminium dome tweeter I fear are
> being used at their best in those cheap presswood "sealed" box. I
> plan to recase them in new enclosures made from cut pieces of big
> 8" diam blue aqueduct pipes, with a flat mdf baffle in the front, for
> midrange and tweeter, slightly angled up (better for the image). The
> would fit at the bottom of the unit, facing down, in a closed muffled
> chamber of its own, the unit standing 12" or so from the floor on a
> of spikes.
> I figured the general design and science, but I'm having a REALLY
> finding technical specs for the drivers in there, and Technics
> don't seem to have any "official" presence on the WWW.
> Since I need those specs badly to calculate the final box parameters,
> since i don`t have a lab to test them, I would IMMENSELY appreciate
> you might have, as to where I could find those specs, or contact
> to Technics speakers division.
What's wrong with doing the obvious and simply making the volume
of your new box the same as the existing one? And, if you've "figured
the general design and science," that would indicate you have the
wherewithall to actually measure the drivers as well, since that
is an integral and inextricable part of the "general science" of
However, the configuration you describe has all sorts of technical
issues. You've decided on a design without first even considering
whether or not the drivers are suitable for the design.
But, beyond that, I think you'll find that, as much as you might
think otherwise, the purse you're trying to make out of these
sow's ears will still oink. Technics is NOT known for there high-
quality, innovative, high-performance drivers. In fact, they're
pretty low-end units, whose main design constraint is minimal
cost, with little, if any, thought given to performance.