From jjmcs49@yahoo.com Sun Feb 13 12:28:19 2005
Subject:Re: XK3 Leslie Speak Sim Comment.


Kel, Below is something I wrote elsewhere a while ago. From what I
could see on the meters, it seems the best way to position the left
and right speakers is side by side at a slight angle. If speakers
are needed on both sides of the stage, having two sets of left and
right speakers side by side at say a 45 degree angle (ie: _\/....\/_
maybe each pair angled toward the center a little more) would
probably give the best sense of motion.

By attaching the left and right rotary outputs of the 2101 to a
mixer with meter bars, I was able to "watch" the lower rotor turn.
It actually turns both ways. I'll describe what happens when the 8'
drawbar is the only one out and each of the 6 C's is played. For the
3 lowest C's what happens is that the right channel increases in
volume and just before the right channel reaches full volume the
left channel starts to increase. The right channel stays at full
volume and the left catches up. They stay equal for a short time and
then the right starts to decrease. Just before the right reaches
bottom, the left starts down. They both are at minimum for a little
bit and then the right starts to rise again. The left channel chases
the right a little sooner for middle C than the lowest C. When I
press the fast button, the process speeds up, but stays the same. It
works the same way during slow down. For the C above middle C, the
process is reversed, and the right channel chases the left. For the
2nd C above middle C the right chases a little sooner. There is not
enough from the highest C sent to the rotary outputs to register
much on my meters. In the octave where the frequencies change
direction, each channel does kind of a double pump in its cycle,
each note is a little different until the pattern is reversed. Also,
crossover frequency, cabinet resonance, mic distance and angle have
some effect on the pattern.

It is exactly the same no matter which direction the horn is
turning. This enables the user to emulate Leslies with horns and
drums turning in the same or opposite directions.

The Leslie 2101 and 2121 manuals indicate that the best way to
connect two upper units and two lower units is to have one of the
upper units connected to both lower units and the second upper unit
on its' own. Probably because of the way the upper unit simulates
the motion of the lower rotary.

You might also go here:
http://www.musicplayer.com/cgi-bin/ultimatebb.cgi?ubb=forum;f=18
and search for XK-3 Tips for more info.

> Thanks, just my opinion, Kel