Find a source that is cheaper, but where? I'll wait. I've looked at Digikey and others. No one is what you'd consider "cheap".

You can taste the difference between most types of fish but people can't tell the difference between film caps cheap or expensive. If they test the same they must perform the same there is no magic in electronics just placebo effects

@@mikepxg6406 Absolutely incorrect! Cap type used in tweeter or midrange will greatly affect it's tonal balance , transient response, clarity, overall resolution as this cap acts as filter and stores energy and releases it back in filtered form to the speaker. It is sad to see some folks with engineering background not understanding it speak like experts in the matter .

No that's just nonsense

@@mikepxg6406 I built a pair of speakers using the RD -57, push pull, planar magnetic, operated as a dipole, and 2 Morel 164s/channel, each in their own 12 ft long schedule 40 pvc waveguides. Built my version of the Old Colony/Audio Amateur, Class A, MOSFET output stage, "Lang Amp", to power the system. The initial crossover was 10, 10uf IAR Wonder caps and a 100uf Solen, metallized polypropylene caps and a CFAC inductor for a single pole filter network. About 7 years later, Parts Connection was having a sale on the MIT, aka Reliable Capacitors. So to replace the Solens, I purchased 3, 20uf Polypropylene film caps, a 30uf Polypropylene film cap, and 3, 3uf Polystyrene caps/channel. I left one channel's xover alone and did the replacement on the other. I Listened in mono, summing the channels, to observe if there was a difference, to satisfy my curiosity. The higher quality caps allowed far more information, as in spatial, and more mid/high frequency energy to pass through, with greater clarity. Switched back and forth between the two filters for over an hour. The difference was readily apparent. Obviously, I couldn't perform double blind testing, but it did satisfy me that the difference was quite observable.

@@hoobsgroove Thats why people with your opinion should build kitchen appliances not quality audio .

@mikepxg6406: That’s a great point. Today’s electrolytic capacitors are crazy better then what was around back then.

@@bikdav that's the thing. If you are going to go to all that work, and only care about yourself and them lasting another say 20 years, then yeah, go for the same value electrolytic caps. But if you are planning on handing down the speakers to a relative when you are 6 feet in the ground, and want them to last another lifetime, then maybe biting the bullet for some good film caps might be in order. It just depends on your ideas and expectations of the whole thing.

most had non polarised electrolytics in parallel to get correct value and keep cost down.

@@mikepxg6406 Yes. I remember that now. Thank you.

Yes, I can attest to this - my wife becomes paralyzed if there are more then five items on the restaurants menu.

@@joeythedime1838I searched for the name for it:: Choice overload, also known as overchoice, choice paralysis, or the paradox of choice, describes how people get overwhelmed when they are presented with a large number of options to choose from.

I spend most of my day in a state of mental paralysis. At my age it has turned into a blissful hobby experience.

Exactly its pointless trying to polish a turd.

Old electrolytic capacitors drift in value over time as they dry out and can even be dangerous to your tweeters if the value becomes out of spec too much. They can send too much power to them and you end up with fried ones that are irreplaceable. One site noted that, "Do you need these capacitors? Twenty years ago, when we began servicing these speakers, there didn't appear to be any need. However, perhaps ten years ago, we began to find capacitors manufactured by Callins Inc. installed in other AR speakers that were way out of spec. That created concern for the AR 9 and AR 90 speakers and we began finding them in these also. In recent years, customers have been requesting this kit for their speakers, particularly needing them for the tweeter section. However, even though some larger Callins capacitors may be found in the woofer crossover section, the impact does not appear to be as great. Now, if you have a late production pair of these speakers and find your capacitors to be manufactured by Sprague Electric, there is no need to replace them. We have never found a Sprague Electric capacitor to be out of spec."

Mylar is actually a trademark for polyester film products. specifically BoPET (biaxially oriented polyethylene terephthalate), so I think the composition is known.

@@michaelturner4457 Thanks.

Try living in South Africa....

Try living in Laos...

@@michaelturner4457 hahahaha ... ok 😆

Have they not invented international postage in Australia yet.

You're free to order from abroad. You can even become an importer for products... and then you'll discover that Australia's small population is why you have fewer options.

Personally I’d bin the whole crossover, bi-amp it and use an active crossover. Passive crossovers are horrible things.

Those EVO Oil are great value , used them too , but the Supreme Silver OIl is my favourite , more expensive I know . Humble home made Hifi is also my reference when it comes to audio caps

Where I am, can't even find a McDonald's, never mind the luxury of exotic film cap availability.

@@michaelturner4457 Greece…?? 🤔 Maybe Cypress.🤔 I cannot understand a word you are saying. 🤔🙄

Neither look after your body don't eat American junk food.

You think that is hard, go to an ice cream store with 31 flavors....

Still top notch. Teflon only makes sense as a coupling cap in key spots like an interstage cap in a tube amp. Not worth it for a speaker crossover.

Most people pretend they can hear a difference...

@@mikepxg6406 You are so right about that.

Think it is still a very good material. At least it won't change value over time like the old electrolytics could.

I know Jupiter does paper caps, Which from experience of working on older radios and TVs, many caps with a paper dielectric layer don't tend to age very well and often go leaky.

Waste of money in old AR speakers. You can't make a silk purse out of a cows ear.

@@mikepxg6406 I take exception to that. My AR-9 hold their own against any new speakers on the market $6000 or less. But yeah, of course there are "better" speakers out there, here 43 years later. There OUGHT to be considering technological advances in materials, manufacturing, and computer simulations available that were only dreamed of in 1980.

I use them extensively in my system. Nothing like it as a filter cap particularly for noisy digital circuits. I also have some of the blue speaker caps. Similar in performance to a good foil cap at a fraction the price and size.

They were fitted as standard in some of the BX range of Rotel Amps and CD players from the 90's My old limited edition Rotel RCD965BX has them everywhere. It still sounds superb. It would cost an arm and a leg to produce it today.

@@mikepxg6406 I'm not very up-to-date with new capacitor products, those which I tried were not competitive. So I buyed a bunch of it.

Speaker Crossovers are a network of Capacitors(Caps), Inductors & sometimes Resistors. Caps are the one component that deteriorates over time losing its ability to couple signals or filter frequencies. Their values/performance can change which affects the crossover frequencies & frequency response. The same goes for caps in electronic circuits.

To add to what Jim Settlecase said, the old electrolytic capacitors would change in electrical value over time as they dried out. If they drifted too far from their original values, they could endanger your tweeters by allowing too much power to get to them. New film-based capacitors should never "dry out" and change value. Once you replace the old crappy ones, you should be set for life.

@@clickbeetle2720 see there you go again clickbeetle!

Great advice. Also Obbligato gold for the tweeters makes a little bump up for not much money.