PSB 800i Crossover Diagram

[Greg64]

Looking for information on the specifications of the components in this crossover for the PSB Century 800i speakers.

The only components that have markings are the 7.5 ohm x 10 watt resistor and small 8uf x 100v bipolar cap.

I’d like to replace some of the parts with better performance components to improve the sound of these speakers (which is already great) and ensure they last a long time.

From what I know the open air coil should be good and I think it could be reused unless some of you could give me a reason to replace them.

The help I need:
I don’t know the value of the laminated iron core inductor or the yellow bit, which I can’t tell if it’s a film cap or another resistor.

I’m running these speakers right now so I hate to tear the crossovers apart to take out of circuit readings, but a guy’s got to do what a guy has to do if need be.

Please and Thank You for any advise!

Oh and yes I contacted PSB, they said the speakers were old and they don’t have the information any longer. More likely since I wasn’t buying new they weren’t going to take the time to look it up for me.

 

[homebrew]

I wouldn't worry about the inductors. They don't deteriorate with age like capacitors. You may have to pull the crossovers to read the values as diagrams don't appear to be available. The yellow mylar cap and the black electrolytic should be replaced with like values. Don't worry about voltages, just as long as the replacements are equal to or greater than the OEM's. I would also replace the sand cast resistors with 1% Dayton 10W minimum resistors.

 

[Greg64]

I wouldn't worry about the inductors. They don't deteriorate with age like capacitors. You may have to pull the crossovers to read the values as diagrams don't appear to be available. The yellow mylar cap and the black electrolytic should be replaced with like values. Don't worry about voltages, just as long as the replacements are equal to or greater than the OEM's. I would also replace the sand cast resistors with 1% Dayton 10W minimum resistors.

Thanks for the feedback. Was thinking that upgrading to a larger air core over the iron core might help the sound, but I could take it a step at a time. Thanks for the guidance on the yellow mylar cap. I wasn’t sure what it was.

 

[homebrew]

Replacing the cored inductor with an air core equivalent means you'll have a new inductor that is quite a bit larger, so space is a consideration. Also in addition to having the same inductance, the air core should have resistance as close as possible to the original.