Restoring some vintage speakers and found a crossover cap valued at 6.8j 100v DC. By my calculation, that's roughly 1360uF at 100v. It's fairly small, axial, and high temperature (105 degrees celcius rated) to complicate things.

Any ideas of what might be a good, long-life, low tolerance replacement? I can't seem to find anything that fits the bill.

I figure that this cap is used to limit the frequency response of the mid, and in doing so acting as a protection mechanism for these bookshelf speakers. Was thinking of maybe sticking two 1000uf axial caps in parallel and thereby lowering the frequency response a little.

Thanks for your help!

Edit: replacement suggestions should ideally be non-polar. Edit 2: Mystery solved, the J on the cap wasn't a unit but rather a tolerance code. Thanks guys!