[HAM] Leslie 145 Drivers

[David Anderson]

Jordan,

Good question.

I spent some time last summer trying to figure out if Leslie had a  
definite standard phasing arrangement for the horns and woofers.  
Based on their schematics, it seems inconsistent.

You can try it both ways and see which way you like it best.

The most important thing to know about Leslie driver polarity is that  
they *accidentally* reversed the phase of the amps when they went  
from the single-speed models to the two-speed models. (I have this on  
good authority from someone who spoke to Don Leslie about it; it had  
to do with relocating the plugs on the amplifier.) Thus, if you're  
running a single-speed cabinet and a two-speed cabinet in tandem, you  
have to devise some way to make sure the woofers are in phase. Proper  
phasing is more noticeable at lower frequencies.

David


On Jan 21, 2008, at 8:15 PM, Jordan Kersten wrote:

>
> Does anyone know the polarity on the leslie drivers?  Is black  
> ground or hot?  The V21 driver has a red dot, which I assume means  
> positive but when I removed the driver, and the black and green  
> wires are switched.  The green wire from the crossover is connected  
> to the red dot terminal on the driver, but the black wire is  
> connected to the same red dot terminal on the inside of the driver.
>
>
> -Jordan-