Crossover Question

Can someone tell me whether this is just a parallel 2nd order crossover or something different?
When I try to redraw it in a conventional way it doesn't layout the same. Any ideas what kind it is & how & why it might be different?

 

Odd isn't it.

Mark earth on it and flip the LF inductor to the right side and it should make more sense. And put the parallel C and L after the series ones.

Arrgghh thats done my head in, must go and solder something

 

Well it works

 

Hi Ant,

This is the layout of the Vitavox crossover in my speakers. I've been looking at the diagram I made trying to work out how it works and if it really is just a straight 12 dB/octave 2nd order job.

The design probably dates from the 50's/60's but I don't think mine were made that long ago as the caps are some kind of film polyprop type and the older ones would have been PIO. Coils are both aircore though.

I'm glad it seems to work. It certainly sounds as though it does, I just can't get my head around the way its laid out.

 

I've used too brain cells on it it's beyond my meager skills to be honest.

It did crap out at the crossover point but then again look at the scopes, they were sine waves on the way in

I set the crossover point at 100hz I think (if it behaves like a regular 2nd order) and the scope on the left is showing 199hz not 99

 

Series crossover?

 

Well it is but the zobel is across the entire signal, but has that one wire between the drivers.

odd ball

 

I changed my first dumb-ass thought Ant!

 

I've got it I think, It is a normal second order with the phase reversed on one of the drivers.

I wasn't calling you an odd ball referring to the design

 

plus

 

Guys Mosfet is right it is simply a 2nd order series crossover.

 

but the connection between the two drivers wouldn't be there would it?

 

Yep, I know Ant. I was referring to my own engaging keyboard before brain post!

(not a first order with zobel, 2nd order series as T says)

 

Oh I see what you mean. It is the same as a 2nd order series but the woofer's inductor is in the negative line instead of the positive. I'm not sure how that would play out, it is a bit of a tease. Ask on www.diyaudio.com

 

Looks familiar D'Appolito

 

Actually 2nd order pseudo D'Appolito, take out R2 and the second driver and you have Murray's crossover.

Actually Murray is it a two way it's used in?

 

It is the xover between the bass horn & midhorn and happens at about 500 Hz. Being an old 'pro' unit, the inputs are labelled 1 & 2 rather than + & - and the o/ps to the drivers are each also labelled 1 & 2 as are the drivers themselves.

It sounds ok.

What are the pro's & cons of series type xovers (if that is what it is) compared with parallel type?


That D'appollito xover is the same. Mine also has the L Pad on the high pass side but I left it out for simplicity's sake

 

interesting piece here

http://sound.westhost.com/parallel-series.htm

 

http://www.humblehomemadehifi.com/Crossover.html