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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Polk Audio RC55i 2-Way in-Wall Speakers (White)

Polk Audio RC55i 2-Way in-Wall Speakers (White)

Product ID: 361170556

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Details

Brand
Polk Audio
Speaker Maximum Output Power
200 Watts
Frequency Response
20000 Hz
Connectivity Technology
Coaxial
Audio Output Mode
Surround

🎵5.25" Dynamic Balance Woofer

💧Moisture-Resistant Build

🔊0.75" Swivel-Mount Tweeter

Description

🎶 Elevate your space with invisible, immersive sound

SPACE SMART DESIGN - In-wall installation keeps your rooms clutter-free and stylish
EFFORTLESS INSTALLATION - Quick drop-in mount with rotating cams for a secure, vibration-free fit
BUILT FOR ANY ENVIRONMENT - Durable, moisture-resistant materials perfect for bathrooms, kitchens, and covered patios
PRECISION AUDIO PLACEMENT - Swivel-mount tweeter lets you direct crisp highs exactly where you want
SEAMLESS SOUND INTEGRATION - Timbre-matched to Polk RTi series for flawless home theater harmony

The Polk Audio RC55i is a pair of 2-way in-wall speakers featuring a 5.25-inch Dynamic Balance woofer and a 0.75-inch swivel-mount tweeter, delivering rich, room-filling sound with a frequency response of 67Hz to 20kHz. Designed with moisture-resistant materials, these speakers are ideal for bathrooms, kitchens, and covered outdoor areas. They install easily with a paintable grille that blends seamlessly into your décor and are timbre-matched to the Polk RTi series for a cohesive home theater experience.

Specifications

Mounting Type	Wall Mount
Material	Aluminum
Model Name	RC55i
Speaker Type	In-Ceiling / In Wall
Special Feature	Mounting depth: 2-1/16", Ideal for stereo music or the left and right front or surround channels of a home theater, Impedance: 8 ohms, Recommended amplification: 20 to 100 watts, Includes paintable white matte grilles, Sensitivity: 89 db, Cutout dimensions: 6-3/16"W x 9-5/8"H, 5-1/4" woofer and 3/4" swivel-mount tweeter, Warranty: 3 Year, Frequency response: 70-20,000 hz
Recommended Uses For Product	Outdoor
Compatible Devices	Suitable Amplifier (Not Included)
Subwoofer Diameter	5.25 Inches
Net Quantity	2.0 Count
Controller Type	Corded Electric
Surround Sound Channel Configuration	2.0
Colour	White
Included Components	1 Pair Of RC55i In- Wall Speaker
Age Range (Description)	Adult
Item Weight	3.5 Pounds
Impedance	8 Ohm
Is Waterproof	False
Product Dimensions	33.78 x 25.15 x 22.61 cm; 1.59 kg
Item model number	RC55i White
Speaker Amplification Type	Active
Speaker Count	2
Audio Wattage	100 Watts
Size	228.6mm x 152.4mm x 50.8 mm
Power Source	Corded Electric
Item Weight	1 kg 590 g
Manufacturer	Polk Audio
Country of Origin	China

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Polk Audio RC55i 2-Way in-Wall Speakers (White)

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