Hello, never, you have to be careful to be in the right connection mode on the speaker (Bluetooth, etc...) they are really great, multi-tasking even without a near-amp.
The walnut version of the speakers has a grey woven fabric cover, not a beige/white one. Both covers are not included in the scope of delivery, but there is only one cover per speaker, which is magnetically attached.
The remote control has an infrared transmitter at the front. Your eye does not see this, but a camera sensor, e.g. on a mobile, does. So look at it with your mobile phone camera and press the volume button on the remote control, for example, and you should see the infrared light flashing.
That's not so easy, because the speakers don't have a WLAN module. Theoretically, you could tinker with WLAN audio adapters, but it would probably be better to get WLAN-capable speakers right away. If a surround AV reciever with Bluetooth is available, it would certainly be possible to integrate it via Bluetooth.
I can't give you a tip for the Kanto, as we don't carry them in our range. In any case, the Klipsch are highly recommended. You can connect the speakers to pretty much anything without having to use additional devices. They also have a very high power rating and offer extremely high quality in options, handling and sound. Here you can find the official factsheet on "The Fives": https://d2um2qdswy1tb0.cloudfront.net/product-specsheets/The-Fives-Spec-Sheet-v05-1.pdf
The difference in naming is due to the size of the woofers. "The Sixes have a 6.5-inch woofer, whereas The Fives have a smaller 4.5-inch woofer. Accordingly, "The Sixes" are generally the larger model.