[sdiy] DIY help needed

[harry bissell]

Ok... so I'm not Don.... (sue me)


--- John L Marshall <john.l.marshall at gte.net> wrote:
> 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? 

Conventional thinking assumes a massive woofer...
heavy
cone...

But with a light paper cone (a'la guitar speaker) you
can get to the 3-5KHz range with ease....

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. 

OTOH at some lower volumes, the rise in Bass and
Treble
might actually sound better due to perceived loudness.

But most inexperienced listeners (especially those who
are really there for breeding purposes...) think that
lots of bass and blaring highs ARE high-fidelity.

And the music they listen to doesn't HAVE the missing
midrange anyway...

and their midrange hearing is BLOWN to boot (too much
thumpathumpa in the cars...)

OTOH : I designed speakers for my Band... using actual
DAT recordings as the source. For a month I tried to
get a good flat sound... like my EV System 200
Monitors. Then... a lucky accident. I accidently made
a tweeter peak SHARPLY at 10KHz (about an 8db rise...)
and got "the sound".  I guess EV did NOT attempt to
make the speakers flat... they tried to make them
sound
GOOD in an actual listening test. Maybe you would buy
their speaker because the cymbals sound just 'that'
much better...

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.

Duh... hel-LO.... what did the GIRLS look like ??  ;^)
were you there to actually LISTEN to the music ???

(your living room is better for that....)

H^) harry  (off to the Library... I like nice, quiet
girls...)

> 
> 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
> >
> 
> 
> 


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