Do these speakers have open backs? Do they come with enclosures?

This is actually a great question. As the others have said, the backs are open, which is typically not an issue when installing into a wall or ceiling. HOWEVER...if you install into a ceiling that has blown insulation above it (the loose cellulose kind, not the rolled fiberglass kind) then you WILL want to come up with your own way of keeping the loose insulation off the backs of the speaker. If you don't (as I didn't the first time I bought these) then over time the quality and volume of the sound will lessen because of the insulation working into and pressing against the cones. I had to replace one set because of this problem.

How much sound is transferred to the room above? I'm installing in a basement ceiling below a bedroom.

Depends on the construction of the house. I would Place a bat of fiberglass insulation behind the speaker if there is no insulation in the ceiling. This will reduce the transmission of sound upstairs , and improve the sound of the speaker in the room it's installed.

what is the difference between the 6.5 inch vs the 8 inch versions?

The tweeters are exactly the same between the two. The 8" model has a larger woofer and therefore will provide better bass reproduction (i.e., deeper low end bass). The reason for the different sizes is sometimes the spacing distances between the ceiling joist and wall studs will dictate which one you can use . If your wall studs or ceiling joist are on 16" centers then get the 8"... if they are on 12" centers you'll have to settle for the 6.5". Hands down... if you have the room get the 8". Just FYI: The 8" version outsells the 6" version 2 to 1.

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Description

🎶 Elevate your space with immersive sound that thrives anywhere!

CUSTOMIZABLE AESTHETIC - Paintable white grille blends effortlessly with any ceiling décor
DEEP RICH BASS RESPONSE - 8-inch mineral-filled polymer cone delivers powerful lows from 35Hz
PRECISION HIGH FREQUENCIES - 1-inch metalized soft dome tweeter with 15° swivel for targeted clarity
BUILT FOR HUMID ENVIRONMENTS - Durable moisture-resistant materials perfect for bathrooms, kitchens, and covered porches
SEAMLESS SOUNDSTAGE INTEGRATION - Timbre-matched to Polk RTi Series for flawless multi-room harmony

The Polk Audio RC80i is a premium pair of 8-inch 2-way in-ceiling speakers designed for damp and humid indoor/outdoor environments. Featuring a dynamic-balance woofer and a swivel metalized tweeter, these moisture-resistant speakers deliver clear, immersive audio with seamless integration into Polk’s RTi Series. Their paintable grilles ensure a sleek, customized look for any modern living or entertaining space.

Specifications

Is Electric	Yes
Speaker Maximum Output Power	50 Watts
Connectivity Protocol	Wi-Fi
Connectivity Technology	Bluetooth
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Item Weight	9 Pounds
Item Dimensions D x W x H	3.63"D x 10.75"W x 10.75"H
Unit Count	2 Count
Impedance	8 Ohm
Number of Audio Channels	2.0
Compatible with Vehicle Type	Car
Compatible Devices	Home Theater
Speaker Size	8 Inches
Tweeter Diameter	1 Inches
Controller Type	Corded Electric
Color	White
Is Waterproof	FALSE
Warranty Type	Lifetime
Control Method	Touch
Audio Output Mode	Surround
Mounting Type	Ceiling Mount
Speaker Type	In Ceiling
Additional Features	Tweeters
Subwoofer Diameter	8 Inches

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