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 IN-WALL LDSPKR

Product ID: 734542429

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Details

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

🎯Swivel tweeter for precise sound

🔊8-inch dynamic balance driver

🛠️3-step easy installation

Description

🎶 Elevate your space with invisible power — hear every detail, see nothing but style.

EFFORTLESS SETUP - Install in just 3 simple steps—drill, wire, and drop—no extra tools or clutter needed.
POWERFUL PERFORMANCE - 100W output with 8-ohm impedance ensures rich, room-filling audio for movies, music, and gaming.
PRECISION AUDIO IMAGING - Swivel cam and aiming tweeters deliver crystal-clear sound from any angle.
SEAMLESS IN WALL ELEGANCE - Paintable grille blends invisibly with your decor for a sleek, modern look.
PERFECT HOME THEATER MATCH - Designed to seamlessly integrate with Polk Audio systems for a flawless multi-zone surround experience.

The Polk Audio RC85i is a pair of 8-inch, 2-way in-wall speakers delivering 100 watts of clear, dynamic sound. Featuring a paintable grille for discreet installation, swivel tweeters for precise audio imaging, and a simple 3-step mounting process, these speakers are engineered to blend seamlessly into any home theater setup while providing powerful, immersive surround sound.

Specifications

Mounting Type	Wall Mount
Material	Aluminum
Model Name	RC85i
Speaker Type	Outdoor
Special Feature	Waterproof
Recommended Uses For Product	For Surround Sound Systems
Compatible Devices	Home Theater
Subwoofer Diameter	8 Inches
Unit Count	1 Count
Controller Type	Corded electrical
Surround Sound Channel Configuration	2.0
Color	white
Included Components	2 white in-wall speakers, 2 white grilles, 1 cardboard mounting template
Product Dimensions	8.9D x 25.7W x 36.1H cm
Age Range (Description)	大人
Item Weight	2.5 Kilograms
Impedance	8 Ohm
Is Waterproof	FALSE
Warranty Type	Limited
Maximum Range	7 Meters
Item model number	AW0085-A
Is Discontinued By Manufacturer	No
Color Name	white
Material Type	Aluminum
Output Wattage	100 Watts
Power Source	Corded Electric
Wattage	100 W

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RC85I IN-WALL LDSPKR

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