Can Infinity Kappa Polydomes be replaced by ...?

Yes. There will be a difference in sound. Those are 2 totally different drivers. Stick to the OEM speakers.

I tried the replacement dome only that is listed on eBay. I don't have the equipment to install properly, and the midrange output on that speaker is 'off' from the original still in the other speaker. I don't recommend and of the other drivers, and I've given up - the search is on for replacements for my beloved Kappas.

English, it might be beneficial to Yoram and others who might read this thread if you could post a link, or clarify which Polydome replacement you tried and what specs were out? The reason I asked is that Orange County Speaker Repair, Simply Speakers & The Speaker Exchange all use and recommend the above-mentioned fabric dome replacement.