[sdiy] I got my cheap LM13600s...

[Scott Stites]

Dang, Ray,

You had my cube mates wondering what made me cackle/choke on my coffee this
morning.  Looks like the chips are coming home to roost.  Ma and Pa Goldmine
been beddy good to me today, too.

Cheers,
Scott

----- Original Message -----
From: "Ray Wilson" <raywilson at comcast.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 25, 2003 4:54 AM
Subject: [sdiy] I got my cheap LM13600s...


> Hi
>
> In the continuing saga of the LM13600 I received my 25 today. I embraced
the
> bag and rejoiced.
>
> I can only think that confusion reigns at Electronic Goldmine. The scene:
> mom and pop Goldmine are surveying their stock.
>
> Pa: "Hey ma, look at that shelf yonder about ready to bust with the weight
> of all those LM13600s."
> Ma: "Yeah, dagnabbit, what'll we do?"
> Pa: "Well now less think on it, Arrow Electronics sells em for $4.25
> apiece."
> Ma: "Good Lord those fellers sure is greedy!"
> Pa: "Yeah ma, lets give em away for $0.20 apiece and see what happens, it
> might bring world peace or somethin'"
> Ma: "Thats why I married you Pa Goldmine. You is one nice feller."
>
> One week later...
>
> Ma: "Well now, who in the hell was them SYNTH-DIY fellers anyway..."
> Pa: "Lord-a-mighty we could a got $5.00 apiece for them LM13600s."
> Ma: "One feller was ready to give me his kids for em."
> Pa: "Oh well..."
> Ma: "Hey Pa look at that shelf yonder about to bust under the weight of
all
> those Curtis Electromusic chips..."
>
> The end.
>
> Ray (LM13600) Wilson
>
> ----- Original Message -----
> From: "Czech Martin" <Martin.Czech at micronas.com>
> To: "Harry Bissell Jr" <harrybissell at prodigy.net>; "Peter Grenader"
> <peter at buzzclick-music.com>; "john mahoney" <jmahoney at gate.net>;
> <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, November 25, 2003 4:17 AM
> Subject: RE: [sdiy] semi ot: loud speaker for synths
>
>
> > Harry,
> >
> > -a sub in the corner was not intended.
> >  I think this simply doesn't work. I can hear, if
> >  low frequency pressure is on one ear or the other,
> >  I do not believe into this "sub bas has no
> >  direction" nonsense. The intensity on the ear
> >  towards the speaker is always higher then on the other
> >  ear, the closer you are the more pronounced.
> >  Also, correlation has to be watched
> >  for a single subwoofer, otherwise it might
> >  cancel in the summing amp already
> > -I can not see what the membrane diameter has to do
> >  with the useable displacement. (This is not the maximum displ.).
> >  But I can see that a large membrane (remember the 80cm
> >  Fostex chassis?) has problems with stability and
> >  partial resonances. Given that the coils, magnets
> >  and crimping have the same quality, a 4*10
> >  can work better as a 1x18, because the seperate membranes
> >  are better controlled
> > -a bandpass or other vented construction can make sense
> >  if the LPF cutoff frequency is pretty low, say 50Hz.
> >  Other frequencies must not be transmitted (electronic
> >  filter). In that area you have the first resonant modes
> >  of the room, so the characteristic has nothing to do
> >  with the anechoic theoretical response.
> >  A good bandpass design can prevent too much distortion,
> >  which is a main problem for deep bass sinoids.
> >  Only if it works with frequencies it can not handle
> >  or is deliberately tuned too high you get this boomey
> >  "annoy the neighbour" sound you mentioned.
> >  Of course this does imply a 4 way system.
> >
> >
> > m.c.
> >
> > > -----Original Message-----
> > > From: owner-synth-diy at dropmix.xs4all.nl
> > > [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Harry
> > > Bissell Jr
> > > Sent: Montag, 24. November 2003 21:46
> > > To: Peter Grenader; john mahoney; synth-diy at dropmix.xs4all.nl
> > > Subject: Re: [sdiy] semi ot: loud speaker for synths
> > >
> > >
> > > Y'all got your flamesuits on ? :^P
> > >
> > > Like the movie "Godzilla"... bigger IS better.
> > >
> > > One good 18" can outrun almost any of the so-called
> > > powered subs.
> > >
> > > Making a system with "bandpass" boxes in a mistake
> > > IMHO... good for earthquake rumble and hip-hop
> > > annoyance
> > > of pedestrians and other motorists... but not for
> > > HiFi.
> > >
> > > The 18" does not require special (active) EQ and servo
> > > amps etc...  They are extrememly efficient by
> > > comparison.
> > >
> > > OK now that I've whacked Peter (hmmm that sounds
> > > different than I meant it.... ;^)
> > >
> > > lets discuss why the modern "small" subwoofer might be
> > > better.
> > >
> > > 1) It fits in your studio
> > > 2) You CAN spare the extra power
> > > 3) you have no problem with the active crossovers
> > > 4) did I mention its small ???
> > >
> > > These are good things, which you pay for in loss of
> > > efficiency, and ultimately in overall SPL.  NOT a
> > > studio
> > > problem.
> > >
> > > I was assuming that the use (since we were talking
> > > about like 4 x 12" speakers) would be for live sound
> > > reinforcement... in which case the bigger box is going
> > > to win every time.
> > >
> > > In my studio I'm using JBL4410 and I agree that there
> > > is plenty of bass from a 10" driver and you don't need
> > > bigger than that. But if I tried them live... Id turn
> > > those 10" cones into confetti in no time. There is a
> > > limit to the excursion possible in a 10" speaker.
> > >
> > > Given a choice... I'll take the 18" for live (and YOU
> > > get to be my roadie).  For home, I don't feel the need
> > > for subwoofer at all.  I like a good full range system
> > > better than one sub in the corner...
> > >
> > > ...your mileage may vary :^P
> > >
> > > H^) harry
> > >
> > >
> > >
> > > --- Peter Grenader <peter at buzzclick-music.com> wrote:
> > > > Czech, listen, I have Bob Diamond's email address
> > > > (founder of Diamond Audio.
> > > > later with M&K, now with Cervin Vega). He can tell
> > > > you the optimum cabinet
> > > > design if you want to do it yourself.  Contact me
> > > > off list for that address.
> > > >
> > > > in regard to this:
> > > >
> > > > john mahoney wrote:
> > > >
> > > > > my point is that good low end does not require 18"
> > > > drivers.
> > > >
> > > > Absolutely correct -18's are total overkill.  I
> > > > think you've guys have seen
> > > > that I worked at M&K for three or so years.  Now
> > > > remember - they invented
> > > > the dedicated powered sub (1973), so I assume they
> > > > know something about how
> > > > they work.
> > > >
> > > > They don't make anything larger than dual 12s, and
> > > > the second one is in
> > > > push-pull formation - meaning you don't hear it,
> > > > it's mounted FACING INTO
> > > > THE CABINET and is purposely out of phase with the
> > > > other (this serves to
> > > > push and pull the audible driver from the inside.  A
> > > > more efficient method
> > > > of what a port attempts to do).
> > > >
> > > > You should be fine with 12s, even 10s if the amp
> > > > isn't one of those $26
> > > > dollar Sanyo jobs that Genelec uses for their low
> > > > end subs.  Those things
> > > > suck.
> > > >
> > > >
> > > >
> > > > Peter
> > > >
> > >
> > >
> >
>
>