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AUDIO FORUMS >> General Discussion and Support >> Types of crossover capacitors for Leak Sandwiches
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Message started by oztayls on 06/14/23 at 05:08:52

Title: Types of crossover capacitors for Leak Sandwiches
Post by oztayls on 06/14/23 at 05:08:52

I am in the process of restoring a pair of 1960s 2-way Leak Sandwich speakers. I have seen the recommendation on other forums concerning the types of caps used for this crossover. The old crossover network comprises non-polar 20V electrolytic capacitors (manufactured by Plessey) on these Sandwiches. They mention that without a polarising voltage, they will heavily distort at their turnover frequencies, which in this case are arranged to be around 1kHz, where our hearing is most sensitive. The caps are being replaced by "polyester film types of the stacked film variety which are non-inductive, unlike the round "audio grade" capacitors high-end loons all go ape about - which are highly inductive..."

Have I been living under a rock, because I've not heard of using non-inductive caps for cross-overs before?

Title: Re: Types of crossover capacitors for Leak Sandwiches
Post by oztayls on 07/18/23 at 13:02:01

Thank you for that advice. Much appreciated!

Title: Re: Types of crossover capacitors for Leak Sandwiches
Post by ratketyree on 08/11/23 at 02:30:10

Thank you for sharing; this is very insightful. I really appreciate your help.

Title: Re: Types of crossover capacitors for Leak Sandwiches
Post by EdwardT on 08/12/23 at 14:10:52

This discussion doesn’t really address distortion at the crossover point:
https://www.audiosciencereview.com/forum/index.php?threads/capacitor-upgrade-in-crossover-is-it-audible-part-2.12447/
and I admit to not knowing a discerning answer. The main complaint I read is speed, the foil caps apparently don’t delay the signal as much. That said, I’ve never seen measurements of that sort so my guess is it’s subjective analysis.

Title: Re: Types of crossover capacitors for Leak Sandwiches
Post by Tooppy on 08/13/23 at 10:51:27

It seems your Sandwish are in pretty good shape, that wasn't the case for mine given by a friend. I could only keep the box, the tweeters were gone and one of the woofer died. So with the box I made a different pair of speakers all together using Beyma drivers.