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Turning the sub into a passive is easy all you need to do is install a set of binding posts and disconnect the amp from the woofer then obviously do not plug the sub amp into an outlet. As far as replacing the sub with a new model if you look at the published specs the 10" version is the same as the RSW-15 so you wouldn't necessarily have to get the huge 16" as a replacement you might consider the 10 or 12 if space is a concern

I was going to suggest running the center and surrounds off the AVR and bi-amp the RF-7's with the Parasound those towers will eat up a lot of power

I had the T-500 years back while the cabinet quality and construction was cringeworthy they actually did sound quite good, much like a forte 1 but with slightly less bass output. I cranked them up pretty loud a lot and never noticed any issues with the cabinets.

Seeing what the Chief has done over the years if he does turn the La Scala into a two way would likely use the k-510m / k-691 combo to keep costs down can't imagine he'd go all out with the Celestion driver from the Jubilee which would require DSP that would probably bump the price to $20k or more

I just picked up another pair of the newer RP line these are current model RP-500m-II's Onecall had them on sale for $236 shipped on open box but these had never been removed just slight damage to the shipping box. Now these don't have the bass output the RP-160m's have but they also don't have that very noticeable gap in the midrange overall a very nice balanced sound that is smooth yet detailed, very easy to listen to with a much larger sound than their tiny footprint would have you believe. It's been awhile since I've owned any of the Heresy variants but going on memory I'd say these would give the H-1 through III a real run for their money. Wondering if the @Chief bonehead had a hand in their design updates?

Those are great subwoofers and the cherry veneer is beautiful unfortunately the tech is a bit dated Klipsch just released a new line of RP subs that are on sale now that would likely be the way I would go probably sell the RSW for parts and put that towards a new sub with warranty: https://www.klipsch.com/subwoofers#reference-premiere-sub-series

For theater you want the biggest and best center you can fit / afford as roughly 60% of the sound comes from it typical advice is a matching LCR (left center right) the smaller centers are always a comprise usually due to space constraints so in your case if you cannot fit a third 8000f I'd go with the 504c

Klipsch has a special right now on their new RP subs the smallest version (10") for $489 has the same specs as the RSW-15 likely just over the cost of a plate amp service. https://www.amazon.com/Klipsch-Reference-RP-1000SW-Excursion-Subwoofer/dp/B0BSHDY84K/ref=asc_df_B0BSHDY84K&mcid=bad1fae5699c3c9ba2ef9cf0800dde7b?tag=bingshoppinga-20&linkCode=df0&hvadid=79989604221564&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583589123031484&psc=1 Or if you want to really shake things up the 1600 is on sale for $1169 that's a helluva lot of sub down to 14.5hz for the money: https://www.amazon.com/Klipsch-Reference-RP-1600SW-Excursion-Subwoofer/dp/B0BWNW3JXC/ref=sr_1_3?crid=21QL742XTL8Q9&keywords=klipsch+subwoofer+rp+1600&qid=1700746484&s=electronics&sprefix=rp-1600%2Celectronics%2C145&sr=1-3&ufe=app_do%3Aamzn1.fos.765d4786-5719-48b9-b588-eab9385652d5

First off, happy Thanksgiving! If interested I have the original Chorus k-48 woofers I can re-install and lower the asking price to $1600- I've seen many stock CH-II's selling for around this price and these blow them away hands down in terms of performance. So $1600 with k-48 woofers or $2k with the Beyma drivers thanks.

Title pretty much says it all need to down size my stereo these speakers sound absolutely amazing the 2" exit driver is a game changer with my Carver VTA-180's it was like having the band right here in the living room of course my neighbors didn't appreciate that as much as I did. Currently I'm running these with my little Carver 275 amplifier and they still sound awesome with plenty of kick if you're local (Snohomish WA) and interested send me a PM and we'll set up a listening session. I bought the k-691's from @Schu and the Beyma's brand new my asking price is basically what I have into these in parts Chorus II cabinets thrown in for free. Below is thread where I detailed the build, these changed from 396's to 325's as I strongly preferred the 325 crossovers in this application: Below is the CL listing: https://seattle.craigslist.org/sno/ele/d/snohomish-modified-klipsch-chorus-iis/7689238951.html

As @Peter P. points out you already have a sub so you might consider just stepping up to the RP-600-II's at half the price of the 6000's you'd still be gaining all the benefits of the newest tech, increased driver and horn size plus you may be able to reuse your current stands or mounts. https://www.amazon.com/Klipsch-Reference-RP-600M-II-Cerametallic/dp/B09V5NRNDJ/ref=pd_ci_mcx_di_int_sccai_cn_sccl_3_3/138-0986664-7708400?pd_rd_w=N1Z1S&content-id=amzn1.sym.751acc83-5c05-42d0-a15e-303622651e1e&pf_rd_p=751acc83-5c05-42d0-a15e-303622651e1e&pf_rd_r=KYGJ6BM9D09G12ZHT9PH&pd_rd_wg=FHvPM&pd_rd_r=84e0964b-cf22-4e23-b479-c468560263b9&pd_rd_i=B09V5NRNDJ&th=1

Considering you can buy 2 Klipsch RP-1600's right now brand new (on sale $1169) and still have change in your pocket yeah I'd say it's a bit over priced. The fact that the seller has referenced an amp repair specialist a few times already for his 20 year old sub doesn't instill a whole lot of confidence either. Now maybe if the sub amp was already refurbished and had some sort of warranty but even then I would think it would be a tough sale.

You can't go specs alone the newest RP series have significantly better / higher quality horns, phase plugs and driver tech. Cabinets bifurcated and heavily braced crossovers are much improved as well. I would expect a much more refined, detailed accurate and smoother, more pleasing sound from the 8000 ii's than the older 82's.

Hard to say without hearing both but looking at the specs the r-41's have a tiny 4" horn with a crappy aluminum driver with a 4" woofer-- The size of the voice should be considerably larger with the 6000 ii horn is almost 7" with a substantially higher quality lens, driver and phase plug tech plus dual 6.5 woofers they shouldn't even be close.

Had a channel mysteriously quit on me on one of mine (I had 3 at one point) so I sent it back for a refund