[sdiy] DIY help needed

[John L Marshall]

Don,

Don't you agree that a three-way sounds better than a two-way? (Yea, too
many issues to say one way or the other.) At what frequency does a 15 inch
woofer run out of gas? There is just too much mass and too much inertia to
get very high. And, where does the horn kick in? It takes a pretty big
(horn) mouth and long throat to get down to 1kHz. I think there is a giant
muddy hole in the middle frequencies of these sound reinforcement two-ways
and I  can hear it. B&O clearly out classes the speakers that I was
referring to and they are designed for a different application and more
critical ears.

Yes, the moron DJ may have had the Bass and the Treble cranked up. Thump and
sizzle. He also had the speakers mounted too close to the floor and only the
bass reached the back of the dance floor.

John


----- Original Message -----
From: Don Tillman <don at till.com>
To: <john.l.marshall at gte.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, October 31, 2001 10:37 PM
Subject: Re: [sdiy] DIY help needed


>    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
>