Building crossovers

Yep, as said above use the same values and quality components. I like path resistors. hook the ground wire to your black terminal. I used Mundorf in my crossover and it got expensive. but with only one cap go for a good one, silver, gold oil.

I’d probably leave the fuse out (just replace with straight wire) has it ever blown? I think a lot of people take the fuse out of their Magnapans but I’ve never owned a pair so I’m not sure.

And I’d rewire. I used Duelund tinned copper cotton with excellent results.

Jerry

Edit to add:  since you only have one capacitor, it probably feeds the bass.  but if it does feed the mids or highs, add a duelund bypass cap, .1mF in paralle.  It will cost $50 to $100 per channel.   If it is in the bass feed, then don't bother.

I built new crossovers for my speakers a couple of weeks ago. I used hookup wire from DH Labs. They have a nice variety. I used 18 gauge on the crossover components and 14 gauge to the new binding posts. I got the amount of Cardas eutectic solder I needed from Ebay. I'm very happy with the results. 

3 caps and a resistor shouldn't be too hard to make. It wasn't easy but worth the effort. And a nice sense of accomplishment. There are YouTube videos you can reference. 

Marchand Electronics can probably help

https://www.marchandelec.com/oem.html

You might be tempted to get one of their tube electronic crossover that can potentially upgrade pretty-much any speaker. The beauty is that it's fully adjustable and you can set-up any allocations to your taste. These guys can also recommend an array of useful tools to measure all necessary settings.

Thanks for all help Gents!

Give Danny Richie at GR Research a call or email. He had had at least one Magnepan model sent to him for evaluation, and he posted a YouTube video in which he discusses and demonstrates what he discovered. As he regularly does with loudspeakers sent to him by customers, he designed a new crossover for that Maggie.

Ah, here it is:

https://youtu.be/_bpDP0jxj4k?si=yZDkiel-87wgTzEY