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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RC85i 2-Way Premium in-Wall 8" Rectangular Speakers, Perfect for Damp and Humid Indoor Placement - Bath, Kitchen, Covered Porches (White, Paintable Grille), 1 Pair

Product ID: 1156094

Details

Audio Output Mode
Surround
Brand
Polk Audio
Connectivity Technology
Auxiliary
Frequency Response
20 KHz
Speaker Maximum Output Power
100 Watts

🎯Swiveling 1" Silk Dome Tweeter

💧Moisture-Resistant Build

🔊8" Dynamic Balance Woofer

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Description

🎶 Elevate your space with sound that’s as sleek as your style.

BUILT FOR HUMID SPACES - Engineered with moisture-resistant materials, perfect for bathrooms, kitchens, and covered porches without compromising sound quality.
CUSTOMIZABLE AESTHETIC - Paintable grille lets you match your décor effortlessly, making your speakers disappear while your sound stands out.
PRECISION AUDIO TARGETING - Swiveling tweeter directs crisp highs exactly where you want them for a personalized listening zone.
BIG SOUND INVISIBLE PRESENCE - Experience room-filling audio that blends seamlessly into your walls—no bulky speakers, just pure immersive sound.
HASSLE FREE INSTALLATION DURABILITY - Patented secure mounting and rugged aluminum enclosure ensure quick setup and long-lasting performance.

The Polk RC85i 2-Way Premium In-Wall Speakers deliver powerful 8" Dynamic Balance woofer bass and precise 1" swiveling silk dome tweeter highs, engineered specifically for damp and humid indoor environments. With moisture-resistant materials, paintable grilles, and easy installation, these speakers provide immersive surround sound that integrates flawlessly into your home theater or living space, backed by a 5-year warranty for lasting quality.

Specifications

ASIN	B00006I5O6
Age Range Description	All Ages
Antenna Location	For Surround Sound Systems
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Best Sellers Rank	#4,810 in Electronics ( See Top 100 in Electronics ) #828 in Home Audio & Theater Products
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	Aux
Connectivity Technology	Auxiliary
Control Method	App
Controller Type	Corded Electric
Customer Package Type	Standard Packaging
Customer Reviews	4.7 4.7 out of 5 stars (1,176)
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	3.5"D x 10.1"W x 14.2"H
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	In Wall
Specific Uses For Product	Damp and humid indoor/outdoor placement
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	8 Inches
UPC	747192106911
Unit Count	1.0 Count
Warranty Description	5 Years parts & labor
Warranty Type	Limited
Water Resistance Level	Waterproof
Wireless Technology	No Wireless Communication Technology
Woofer Diameter	8 Inches

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KD 139.50

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In stock

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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