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 AudioRC55i 2-Way Premium in-Wall 5.25" Speakers (Pair) | Perfect for Damp and Humid Indoor/Outdoor Placement (White, Paintable Grille)

Polk AudioRC55i 2-Way Premium in-Wall 5.25" Speakers (Pair) | Perfect for Damp and Humid Indoor/Outdoor Placement (White, Paintable Grille)

Product ID: 322037172

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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" Woofer

💧Moisture Resistant

🔊Dynamic Balance

Description

🎉 Transform Your Space with Polk's Premium Sound!

EASY INSTALLATION - Quickly install in just 3 simple steps—no mess, no fuss!
TRUSTED BRAND LEGACY - Nearly 50 years of Polk's commitment to quality and innovation.
MOISTURE PROOF DESIGN - Perfect for humid environments like kitchens and bathrooms.
CUSTOMIZABLE AESTHETICS - Paintable grilles let you match your decor effortlessly.
SEAMLESS AUDIO EXPERIENCE - Elevate your sound quality with Polk's excellent sound reproduction.

The Polk Audio RC55i 2-Way Premium in-Wall Speakers deliver exceptional audio quality with a 5.25" Dynamic Balance woofer and a moisture-resistant design, making them ideal for both indoor and outdoor use. Their easy installation and customizable paintable grilles ensure they blend seamlessly into any environment, backed by nearly five decades of trusted craftsmanship.

Specifications

Is Electric	Yes
Power Source	Corded Electric
Number of Power Levels	1
Speaker Maximum Output Power	200 Watts
Connectivity Protocol	Wi-Fi
Connectivity Technology	Coaxial
Number Of Circuits	2
Item Weight	3.5 Pounds
Item Dimensions D x W x H	9.9"D x 13.3"W x 8.9"H
Unit Count	2.0 Count
Impedance	8 Ohm
Signal-to-Noise Ratio	9E+1 dB
Number of Audio Channels	2.0
Frequency Response	20000 Hz
Compatible with Vehicle Type	Car
Compatible Devices	Home Theater
Speaker Size	5.25 Inches
Woofer Diameter	5.25 Inches
Tweeter Diameter	0.75 Inches
Specific Uses For Product	Damp and humid indoor/outdoor placement, bathrooms, kitchens, saunas, covered porches
Controller Type	Corded Electric
Color	White
Is Waterproof	FALSE
Warranty Type	Full
Audio Output Mode	Surround
Mounting Type	Wall Mount , Ceiling
Material Type	Aluminum
Speaker Type	In Wall
Additional Features	Bass Boost
Recommended Uses For Product	For Surround Sound Systems
Subwoofer Diameter	5.25 Inches

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