From rafael2pop@yahoo.com.ar Mon Oct 08 18:10:12 2012
Subject:Re: Gigging Using Real Leslies

When  buying a commercial passive xover 800Hz it should be considered that usually stock two-way xover doesn't come with 800Hz in mind so for such crosspoint these will be needed for the crossover network:

1) An inductor for the woofer 800Hz upper limit according to loudspeaker impedance  ( 8 or 16 ohm)

2) a matching frequency capacitor for the treble driver

IMO for the phenolic driver an inductor wouln't be needed as cut filter if driver is used at their max. built-in frequency 

FYI: "Frankenleslie"  brand  but all with original guts (incl. motor stacks) except  8ohm Eminence woofer and 8 ohm Selenium driver 

Rafael

  

Mon Oct 8, 2012 12:37 pm        (PDT)        . Posted by:
"Frederick Somerville"         frederickc2d  
Thanks Mike.

I will try that as a next step. I have done it before - just thought that a
commercial 8 ohm 800 hz should work.

But why change a winning combination. of the original.

2012/10/7 Michael Casino

> **
>
> Basic rule of thumb for a starting place:
> Double the capacitor value and half the inductor value.
>
> Leslie 16 ohm speaker uses: 7.8 MF & 12.5 MF caps & 3.2 mH & 5.2 mH
> inductors.
>
> Upper: high pass for 16 ohms is the 7.8 MF cap & 3.2 mH inductor.
> Lower: low pass for 16 ohms is 12.5 MF cap & 5.2 mH inductor.
>
> Mike
>
>
>