What gauge wire is best for this set up?

16 Is fine. But the distance from speaker to amp can change this. Klipsch has a wonderful article on this topic I suggest you read it.

Which receiver is bundled with the speakers? the item listing description indicates & shows a denon while the 'features' section references an onkyo.

I recieved an Onkyo. My only complaint was how it was delivered. Nothing put in secondary boxes and just let on my porch, none of the instructions I left were followed. Luckily Nothing was taken. But I like the system so far.

Number of Audio Channels	5.1
Connectivity Technology	Wired
Item Weight	222.63 Pounds
Unit Count	1 Count
Speaker Maximum Output Power	400 Watts
Speaker Size	6.5 Inches
Controller Type	Corded electric
Color	Black
Is Waterproof	FALSE
Audio Output Mode	Stereo
Mounting Type	Floor Standing
Speaker Type	Surround Sound
Additional Features	Dolby Enabled
Recommended Uses For Product	For Surround Sound Systems, For Televisions, For Computers, For Music Players, For DVD Players

Klipsch Reference Dolby Atmos Home Theater Bundle with R-625FA Floorstanding Speakers, R-52C Center, R-41M Surrounds, R-12SW 12" Subwoofer & Denon AVR-S770H 7.2-Channel 8K AV Receiver

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