Is the rp440wc necessary for dialog if I have a pair of rp-440wfs?

if you need crisper voice , I would say definitely add 440wc. from Amazon (Klipsch Authorized) you may find it for $300 ..and it is worth adding

Can i setup this klipsch rp-440wc wireless center channel speaker with a pair of klipsch r-26pf 260w
and subwoofer klipsch r-10swi 10?

Good Afternoon … My Configuration is as follows …
(4) Klipsch RP-140WM Wireless Bookshelf Speakers – Front and Back
(1) Klipsch RP-440WC Wireless Center Channel Speaker
(1) Klipsch RP-110WSW Wireless Subwoofer
(1) Klipsch RP-Hub1 HD Control Center

Do i have to use this in wireless mode or can it be just used as a regular center channel

There are no wire ports. It’s part of a 7.2 wireless surround system from klipsch. It’s an amazing system but you’ll need at least 2 tower speakers and a sub in addition to the center for it to be worth it.

Does this work with Axiim hub?

The Axiim Link will work to operate with the older HD Wireless WiSA speakers, but it will not firmware update the speakers.

So this still requires additional components to work.. that hub thing? It doesn’t come with it?

There are packages on Amazon that have a hub included for free. it might not say free but if speakers are selling for $300 a piece and the hub is $300 but the package is $600 for two speakers and a hub then you’re getting one of those items free. Just search “klipsch hd wireless”. I started off by buying 2 of the tower speakers that came with a free hub. Do that or get the two satellites (basically the top of the tower chopped off). The center channel is not like a sound bar but it’s a great addition to the system. You won’t get a stereo sound profile without front right and left speakers. I added a sub pretty quickly which was a great idea in retrospect. I now have 4 towers, the center channel, a pair of satellites and 2 subs. Best system I’ve ever owned. You just plug the speakers into an outlet, and sync them with the hub. One last thing, make sure you check with klipsch, before you buy, to verify that the Amazon seller is a authorized dealer of klipsch products. If they aren’t the warranty of void and you might not be able to get it repaired if it breaks.

Will this work with the newer axiim quhd media center?

Yes

Does this item work with denon avr 4300 heos receiver ? would the hub or anything else be needed ?

ONLY WORKS WITH THE HUB.. NO RECEIVER

Does it work with r-28pf towers speakers?

No, the RP-440WC is part of the HD Wireless home theater system. This speaker along with other speakers within that system connect to an RP-HUB-1 to form the system. The R-28PF are a stereo-powered speaker system only.

operating voltage is 110-230V？

The RP-440WC will support 100-240V power.

Can I use this with regular wired speakers

There are no wire jacks on the back of the speaker… so it would be a bit difficult.

What does the hd mean in context of hd wireless control center? (ps: i know hd stands for “hi def”, so i’m asking if ordinary wi-fi system will work)

All of the Klipsch HD wireless systems require the control hub, the hub creates its own Wi-Fi network that all the speakers runoff of. Without the control hub none of the speakers will work

Can you use this to complement wired L & R tower speakers hooked to a receiver, but where you would like to try to avoid a wired center?

No, the RP-440WC is part of the HD Wireless home theater system. This speaker along with other speakers within that system connect to an RP-HUB-1 to form the closed home theater system.

Is this center speaker wall mountable?

It Must be, Mine is over the TV cabinet.