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 space with invisible sound that speaks volumes

EFFORTLESS INSTALLATION - No tools needed—drop-in mounting with secure rotating cams for vibration-free fit
PRECISION AUDIO PLACEMENT - Aimable 0.75" silk dome tweeter ensures crisp highs and wide soundstage
SEAMLESS DESIGN INTEGRATION - Paintable grille blends invisibly into any wall for a clutter-free look
IMMERSIVE ROOM FILLING SOUND - Dynamic 5.25" woofer delivers deep, natural bass and rich audio clarity
MOISTURE RESISTANT DURABILITY - Built to perform in kitchens, bathrooms, and covered outdoor spaces

The Polk Audio RC55i is a premium 2-way in-wall speaker featuring a 5.25-inch dynamic balance woofer and a 0.75-inch swivel silk dome tweeter for rich, immersive sound. Designed for easy, tool-free installation with secure rotating cams, it offers a paintable grille that seamlessly integrates into your walls. Moisture-resistant construction makes it ideal for wet indoor and covered outdoor environments, delivering powerful, room-filling audio without sacrificing space or style.

Specifications

Mounting Type	Wall Mount
Material	Aluminum
Model Name	RC55i
Speaker Type	Surround Sound
Special Feature	Wireless
Recommended Uses For Product	For Surround Sound Systems
Compatible Devices	Home Theater
Subwoofer Diameter	5.25 Inches
Unit Count	2.0 個
Controller Type	Corded electrical
Surround Sound Channel Configuration	2.0
Color	white
Included Components	Polk Audio RC55i 2-Way Premium In-Wall 5.25" Speaker, Set of 2 Ideal for Wet Indoor/Outdoor Placement - Includes Components for Bath, Kitchen, Covered Pouch (White, Paintable Grille)
Product Dimensions	25.1D x 33.8W x 22.6H cm
Item Weight	3.5 Pounds
Impedance	8 Ohm
Is Waterproof	False
Audio Sensitivity	90 dB
Batteries Required	No
Speaker Count	2
Manufacturer	Polk Audio
Item Model Number	RC55i White
Size	2 Pack
Output Wattage	100 Watts

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