From frederick.somerville@gmail.com Mon Oct 08 13:18:46 2012
Subject:Re: Gigging Using Real Leslies

May give wacky results but the original one seems to sound good?

2012/10/8 Michael Casino

> **
>
> In today's world calculating crossover frequencies are 1 of 4 methods.
> BUTTERWORTH, Cherbychev, LINKWITZ-RILEY and BESSEL.
> These can be found on the net!
> The formulas for each method are different thus producing different
> results.
>
> When the Leslie was introduced, they used the m-derived half section
> filters
> (crossover).
>
> If you plug the values of the Leslie crossover components into any of the
> preceding 4 methods, you get real wacky crossover points nowhere near
> 800HZ.
>
> Mike
>
>
>
> 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
> >
> >
> > I am thinking about placing my 142 in our local church just like you
> have.
> > I just need to sort out the Xover since the 142 has 8ohms speaker. I
> > put in a 800 hz 8Ohm network but I still have to much overlap.
> > Strange.
> > 2012/10/6 Lou
>
>
>

--
MVH Frederick Somerville

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