[HAM] SPAM(5.1) Venting a homemade Leslie box

Wed Nov 29 14:49:47 CST 2006

I'm going the other way around. I'm taking a Motion Sound Pro3 and building it into a larger cabinet with a fixed 15" speaker driven by a tiny little SS Crate amp. Unconventional, but it'll sure be tiny and light.

Bruce

----- Original Message ----
From: Bill Odum <bilyod2002 at yahoo.com>
To: The Hammond Forum <hammond at zeni.net>
Sent: Wednesday, November 29, 2006 1:46:52 PM
Subject: Re: [HAM] **SPAM(5.1)** Venting a homemade Leslie box

If you will notice --- Leslies have louvers cut in them on three sides for the sound to come out.  That goes for the top spinning horn and the bottom rotor both. The  upper and lower  back is  completely open with  louvered coveres..  A lot of players remove the backs and turn the leslie around backwards for the sound to come out better to the audience.. I have taken an old leslie and made it into two parts.  The upper in one box and the lower in the other.  This is  to make it more portable and easier to move around. None of the openings are for venting. It does not need venting.
  Bill
  .

Stainless Brown <stainlessbrown at sbcglobal.net> wrote:
  Lou

I'm not sure if this will help, however I have a Model 18, single rotor (drum) the motor is on the nback side of the baffle and pretty much "sealed" into the back of the cabinet (The model 18 has the drum mounted horizontally (spinning axis) rather than vertical, like most other Leslies)

I jusy dismantled a Leslie x77P for the parts to build a smaller more portable Lelsie. The top twin rotor, likewise had the motor underneath in a sectionof the cabinet with no external venting

I'm guessing unless you're housing a power amp with tubes, transformers, or heat sinks in the cabinet, venting for airflow won't be an issue.

Typically, most of the sound is "thrown" perpendicular to the speaker, or in the event you have a rotating drum with the internal mounted speaker (can't remember what Leslie called this) then all sound is from the 'side ' of the drum.

Hope this is of some help.

Stan

Lou Lernor wrote:
Hello:

I thought you might be able to advise me about a Leslie. I found you off 
of one of the Leslie pages.

I bought a used tremelo unit and decided to build a box for it. I just 
don’t know what kind of venting to cut out of the box.

If I cut out just one side of the box, the front where the rotating 
baffle will “expose” the music every 180 degrees, will I have a vacuum 
problem because the box could use a vent cut on the opposite side of the 
box to allow better airflow? Or will an opening on just the front be 
good enough?

I was thinking of cutting about five horizontal slots, about an inch 
high and eight inches wide, where the baffle opening of the baffle will 
expose closest to the front of the box. Or should I cut out an open area 
and install some sort of screen?

If you ever made a box for a Leslie, then you once faced these same 
questions. Any advise?

Lou Lernor

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