JBL JRX 112 crossover

[east electronics]

Here is the 2WAY schematic of the JBL JRX 112 can anyone explain the exact use of the specific capacitors clearly marked with red arrows Bipolar of 8uf ?

 

[east electronics]

Question is if these capacitors are part of the zobel or if these capacitors are part of the crossover circuit ...

These tend to short or leak easier than expected so i wonder what will be the difference if i skip them any way

 

[EarlK]

The 8uF ( in the HF leg ) forms part of a low-Q, 2800hz notch.

The 8uF ( found in the LF leg ) is part of a high-Q, 965hz notch.

I wouldn't disable these notchs since they actually are shaping the overall response.

If they are blowing up it's because the voltage rating must be under-speced for the sort of duty you're putting them through.

Replace these ( BiPolars ) with Mylar film ( or Polypropylene ) capacitors rated for 400V.

🙂

 

[Michael Chua]

Question is if these capacitors are part of the zobel or if these capacitors are part of the crossover circuit ...

They are not Zobels. They are LCR (conjugate networks). Their purpose is to damp the resonant peaks of the drivers.

Do not remove them. It affects the sound.

As Earl suggested, change them to Polypropylene 400V. They last forever.

 

[east electronics]

Michael ...good to see you after such a long time !!! Hope you are doing fine
Earlk thanks for the detailed explanations

Correct the quality of parts there creates problems most of the time cross point choice there is a bit overestimated next to the driver and teh sound of those was never something realy nice

One way or another the circuit is now changed in the 212 series and cross point is altered any way

Thanks for your help my friends !