[sdiy] DIY help needed

[Don Tillman]

   From: "John L Marshall" <john.l.marshall at gte.net>
   Date: Tue, 30 Oct 2001 21:36:03 -0800

   I'm getting crankier as I get older. Another peeve. I was at a dance
   Saturday night. The DJ was using a pair of popular 2-way powered
   speakers (made in the Seattle area) with a 15 inch woofer and a horn
   tweeter. The sound was awful. The light went on. Those two ways with
   giant woofer and horn seldom sound good. What is the most important 
   range of frequencies for clear voice and instrument fundamentals? The
   mids. At what frequency range is the crossover from 15 inch woofer to
   the horn? Right in the middle of voice frequencies. Do filters shift 
   phase at crossover? Use a three way any day.

Actually there are a lot of two way speakers that are considered
excellent.  I think the taste of the DJ is far more suspect. :-)

And besides, there are a number of ways to build crossovers with no
total phase shift: use a 6dB/oct crossover, use an algebraic
crossover, use a biquad style active filter and mix in a little of the
bandpass signal to both sides, the B&O speakers with the bandpass
midrange (same thing, really), and digital filters.

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com