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That is the case the new phase plug is part of the horn assembly but these tweeters are so cheap doubt they'd just send the piece of plastic and risk potential damage to the tweeter diaphragms swapping parts around. Even if they did cost savings would be minimal.

Thanks man! Yeah these are great speakers, I have two customized pairs already just don't need a third pair. A year or two ago you'd be lucky to find a used pair for my asking price.

Weekend bump- would really like to move these out if you're local shoot me an offer thanks.

Are you in the PNW by any chance? I think I may have just picked up your old F-IV's or at least the dealer I bought them from told me a story just like yours, said the buyer eventually came back and bought a subwoofer.

I agree- don't believe most people who shell out the big bucks for new Heritage models buy them with the intent on modifying them. The DIY modders are trying to bring older models up to or near the performance levels of the newest versions either because they cannot afford to buy new or just enjoy tinkering. In either case the "modder" isn't likely to buy new anyway so don't see any real impact on sales. What I find humorous is the same people who say "if you change anything on a 30-50 year old speaker it is no longer true to the original design and you can't call it Klipsch any more" as they pump out their 4th to 7th variation of said design.

Are these 4 or 8 ohm drivers? Have you pulled the drivers to do a thorough inspection? Midwest Speakers sells copies of a lot of the KG line woofers, not sure about the sub models though might be worth the time to message them. https://www.midwestspeakerrepair.com/product-category/home-audio/woofers/klipsch-1/

While all of those things may be true? it is frowned upon here these days to question or suggest that DIY or aftermarket improvements can be made on any Klipsch model no matter how new or old. I know, kind of strange but "they" do own and run the forum so nothing you can do but pose the question elsewhere. Sorry man, the frustration is felt by many.

Are both drivers doing the same thing? Hiss at idle sounds more like an amplifier problem than a driver problem to me. Could it be that you never noticed the "hiss' until after the thump but it may have always been there?

They just had a gathering at Klipsch featuring the newly designed Klipschorn or AK-7 last weekend so I'd have to assume things are still a go, just not sure when. I'd like to know more about the Heritage subs myself.

The RF-7 & 64 combo would serve you quite well IMO, reach out to Cory at Topshelf Audio for a great deal on A or B stock to save some money. https://topshelfaudio.com/

You might get results reaching out to Crossover-Chef, looks like he sells an upgrade kit for these on eBay. https://www.ebay.com/itm/116440526001?chn=ps&mkevt=1&mkcid=28&google_free_listing_action=view_item

These look to be very clean- I've always wanted to try a pair out but these are just too far away, good luck with your sale!

The original MCL-905 page appears to be gone but here's a screenshot clip from a thread discussing them:

@Idontknow Great video thanks for sharing!

Wow there's a deal.. love the RC-7 and RF-5's