what is the depth needed in the wall?

PDF spec sheet indicates 2 3/8 " needed assuming mounted to 1/2" drywall

Do you need a subwoofer for these speakers? Or do they sound ok without it?

I have a pair of these in a wall which are zone 2 speakers for a receiver which does music only and no subwoofer is possible (most receivers only have a sub input for zone 1). I have to say it sounds damn good, though I did place them up near the ceiling and close to walls to optimise the bass. So in this this situation you do not need a sub. If they are part of a home theatre setup then I'd recommend a sub (as I would with any speaker that is not floor standing capable to reaching some really low frequencies).

can I paint it with my wall color?

Yes you can paint it your wall color. The speakers come with a clear plastic insert which act as masks for the frame. The preferred and probably the best method to paint the frames and grill is with sprayed paint...you can spray your custom paint with a kit available at your better paint store. You can also use a small roller but be careful with the grill so that you don't fill in the hole. Several very light coats are best here.

I need them for a concrete wall. is their any problem ? what's the depth of the hole I need to make ?

I think you have many challenges with installing the Polk RC65i into a concrete wall. Overall dimensions (w x h x d) are 8 5/8" x 12 1/6" x 2 7/8". The RC65i requires a 1/2" or 5/8" drywall to mount effectively. If you have drywall over the top of your concrete wall, then this should work (although running the speaker wiring presents its own challenge). The opening in the concrete wall will be larger than the drywall (yet another challenge). I think I would look at a excellent Polk mini-speaker and surface mount that speaker versus tackling the "in ceiling speaker in a concrete wall challenge". But - if you make it work, post your solution to the community as I'm sure they would appreciate the how-to knowledge.

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Description

🎬 Elevate your home theater with invisible power and crystal-clear sound!

IMMERSIVE SOUND IMAGING - Swivel tweeters and dynamic balance drivers deliver crystal-clear audio from any seat in your home theater.
EFFORTLESS SETUP IN 3 STEPS - Drill, wire, and drop—no extra assembly needed thanks to the secure swivel cam locking system.
SEAMLESS IN WALL INTEGRATION - Paintable grille and slim profile let your speakers vanish into any decor for a sleek, clutter-free look.
PERFECT MULTI ZONE COMPATIBILITY - Blend flawlessly with other Polk Audio speakers for a cohesive, room-filling surround sound experience.
TRUSTED DURABILITY PERFORMANCE - Aluminum construction and 100W power output ensure long-lasting, high-fidelity sound that impresses every time.

The Polk Audio RC85i is a pair of 8-inch, 2-way in-wall speakers designed for seamless home theater integration. Featuring a paintable grille, easy 3-step installation, and swivel tweeters for precise sound imaging, these 100W speakers deliver immersive, room-filling audio. Built with durable aluminum and compatible with multi-zone setups, the RC85i offers professional-grade sound clarity while blending invisibly into your living space.

Specifications

ASIN	B00006I5O6
Additional Features	Waterproof
Age Range Description	すべての年齢層。
Antenna Location	For Surround Sound Systems
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Brand	Polk Audio
Built-In Media	2 white in-wall speakers, 2 white grilles, 1 cardboard mounting template
Color	white
Compatible Devices	Home Theater
Compatible with Vehicle Type	Car
Connectivity Protocol	Assist
Connectivity Technology	Auxiliary
Control Method	Remote
Controller Type	Corded electrical
Customer Package Type	Standard Packaging
Customer Reviews	4.7 4.7 out of 5 stars (1,136)
Enclosure Material	Aluminum
Frequency Response	20 KHz
Global Trade Identification Number	00747192106911
Impedance	8 Ohms
Is Electric	Yes
Is Waterproof	FALSE
Item Dimensions D x W x H	8.9D x 25.7W x 36.1H cm
Item Weight	2.5 Kilograms
MP3 player	No
Manufacturer	Polk Audio
Maximum Range	7 Meters
Model Name	RC85i
Model Number	AW0085-A
Mounting Type	Wall Mount
Number Of Circuits	2
Number of Audio Channels	2.0
Number of Items	2
Power Source	Corded Electric
Speaker Maximum Output Power	100 Watts
Speaker Size	8 Inches
Speaker Type	Outdoor
Specific Uses For Product	Wet indoor/outdoor placement
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	8 Inches
Tweeter Diameter	1 Inches
UPC	747192106911
Unit Count	1 Count
Warranty Type	Limited
Water Resistance Level	Waterproof
Wireless Technology	Bluetooth
Woofer Diameter	8 Inches

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Rp20652290

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RC85I IN-WALL LDSPKR

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