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 power and precision sound!

EFFORTLESS SETUP - Install in just 3 simple steps—drill, wire, drop—and lock with vibration-free cams.
ROBUST 100 W POWER - Delivers room-filling sound with 8-inch drivers built for serious audiophiles.
PRECISION AUDIO IMAGING - Dynamic balance drivers and swivel tweeters deliver crystal-clear sound from any angle.
STEALTHY IN WALL DESIGN - Paintable grille and slim profile vanish into your wall for a clean, modern look.
SEAMLESS HOME THEATER INTEGRATION - Perfectly blends with Polk Audio systems for immersive surround sound.

The Polk Audio RC85i is a pair of 8-inch, 2-way in-wall speakers delivering 100 watts of clear, dynamic sound. Designed for easy 3-step installation with secure swivel cam locking, these speakers feature paintable grilles for a discreet look and swivel tweeters for precise audio imaging. Ideal for home theater setups, they seamlessly integrate with other Polk Audio products to create immersive surround sound experiences.

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 個
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
Item Weight	2.5 Kilograms
Impedance	8 Ohm
Is Waterproof	FALSE
Warranty Type	Limited
Maximum Range	7 Meters
Number of Items	2
Control Method	Remote
Wireless Communication Technology	Bluetooth
Speaker Size	8 Inches
Power Source	Corded Electric
Item model number	AW0085-A
Is Discontinued By Manufacturer	No
Color Name	white
Material Type	Aluminum
Output Wattage	100 Watts
Size	1 Pair
Wattage	100 W

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