Will,
I know this wasn't the question, but I cant help but sharing this thought for your consideration. If you haven't already bought the upgrade kit, and you have adequate space around your center for a large model, I have seen many of the larger RP- series center channels very well priced recently. Maybe check slickdeals.net. >tech deals>audio.
My though would be that if you tried to sell your 404-c locally, even for a little under $200, and we're able to get into a larger version for close to or even under $300, you would still have options of doing a crossover upgrade but in that larger platform. You might be able to swap to a larger center at a net cost of $150 to $200. Better now then later. Then get the kit for your new replacement.
If you already bought your kit, then please forgive and ignore me.
Elon
Ezeecrossovers@gmail.com
For anyone else looking at klipsch the rp-500m II is on sale $269, and the RP-600m II at $299. I wouldn't turn down either of those, both excellent with a crossover upgrade kit
