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 sound that disappears but never disappoints!

IMMERSIVE ROOM FILLING SOUND - Experience rich, lifelike audio with an 8" Dynamic Balance woofer and 1" aimable tweeter delivering crystal-clear highs and deep bass.
BUILT FOR DAMP HUMID SPACES - Rubber-sealed, moisture-resistant construction ensures flawless performance in bathrooms, kitchens, and covered outdoor areas.
EFFORTLESS INSTALLATION IN 3 STEPS - Quick-cut, wire-feed, and secure with rotating cams—no mess, no fuss, just premium sound in minutes.
LIFETIME WARRANTY TRUSTED INNOVATION - Backed by Polk Audio’s 50+ years of audio excellence and a lifetime warranty for peace of mind.
SEAMLESS INTEGRATION DISCREET DESIGN - Paintable aluminum grilles let these speakers blend invisibly into your ceiling, elevating your space without clutter.

The Polk Audio RC80i is a premium 8" in-ceiling speaker set featuring Dynamic Balance technology with an 8" woofer and 1" aimable tweeter for balanced, room-filling sound. Designed for easy installation and moisture resistance, these speakers are perfect for humid indoor and covered outdoor spaces. With paintable grilles and lifetime warranty, they seamlessly integrate into any home theater or multi-room audio system, delivering distortion-free, immersive audio backed by Polk’s trusted innovation.

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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