Crossover Layout

[Einric]

I am rebuilding some crossovers for a buddy of mine and I am looking for a second opinion on my layout.
Is this interpretation correct?

Thanks

 

[jimangie1973]

Something is wrong with the tweeter circuit. Assuming the woofer and tweeter circuits are running in parallel, the tweeter circuit is going to short out at low frequencies and fry your amp. You need a series cap before the shunt inductor. Maybe the caps you have after the inductor are before it.

 

[Einric]

The block diagram is a hand drawn representation of the factory PCB.
Does that help at all?

 

[Einric]

AHHHH I see, How about this?

 

[Zuhl]

I think you'll find it's 2R7, then 8µF, then the parallel inductor, then the 12µF. So your bass is 2nd order and the tweeter 3rd order.

 

[jimangie1973]

AHHHH I see, How about this?

That looks reasonable for a 2nd order electrical with a response shaping component pair added.

 

[jimangie1973]

I think you'll find it's 2R7, then 8µF, then the parallel inductor, then the 12µF. So your bass is 2nd order and the tweeter 3rd order.

That could be as well...

 

[Einric]

In the diagram with the square blocks the lines represent the poles of the existing crossover components from the factory and the blocks represent the traces on the crossover PCB as it exists now.
TR & TC8 are in parallel to each other then connected in series to the right end of TC12.
At the junction of TC12 to T+ the one end of the parallel TI comes in.
It looked to me that TI has only a junction to the side of TC12 that is connected to T+.

 

[AllenB]

Your second round looks good.

 

[Inductor]

Fanny, I can't see where the component side of the crossover board is? Or is it me...

 

[Einric]

The pink lines represent the poles of each crossover component as they exist from the factory.

TC12 = Tweeter capacitor 12uf
TR = The 2.7R tweeter resistor
TC8 = Tweeter capacitor 8uf
?L = The unknown value tweeter inductor I will re-use