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.

Rc85i In Wall Ldspkr | Desertcart Samoa

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Description

🎶 Elevate your space with sound that disappears but never disappoints.

SLEEK DISCREET DESIGN - Virtually invisible in-wall installation with paintable grills for seamless decor integration.
EFFORTLESS INSTALLATION - Patented secure mounting system and included template make setup a breeze—cut once, install once.
IMMERSIVE SURROUND SOUND - Fill your space with rich, room-filling audio without bulky speakers.
MOISTURE RESISTANT BUILD - Engineered to perform flawlessly in humid environments like bathrooms and kitchens.
TRUSTED POLK AUDIO QUALITY - Over 50 years of audio innovation delivering durable, high-performance home theater sound.

The Polk RC85i In-Wall Speaker combines an 8-inch dynamic balance woofer and a 1-inch swivel silk dome tweeter to deliver immersive surround sound from a sleek, low-profile design. Built with moisture-resistant materials and a patented secure mounting system, it’s perfect for any room, including humid spaces. With paintable grills and easy installation, it seamlessly blends into your home while providing Polk’s trusted audio performance for years of cinematic and musical enjoyment.

Specifications

ASIN	B00006I5O6
GTIN (Global Trade Identification Number)	00747192106911
MP3プレーヤー付属	いいえ
UPC	747192106911
おすすめ度	4.7 5つ星のうち4.7 (1,135) var
お客様の年齢層	すべての年齢層。
インピーダンス	8 オーム
ウーファードライバーの直径	8 インチ
オーディオアウトプットモード	サラウンド
オーディオドライバのサイズ	8 インチ
オーディオドライバーの種類	ダイナミックドライバー
カラー	ホワイト
コネクティビティプロトコル	補助。
コントローラーの種類	コード付き電気。
サブウーファースピーカーの直径	8 インチ
サブウーファー接続技術	有線
スピーカーの種類	アウトドア
スピーカーサイズ:(cm)	8 インチ
スピーカーチャンネル構成	2.0
ツイータードライバーの直径の測定単位	1 インチ
ブランド名	Polk Audio(ポークオーディオ)
メーカー名	Polk Audio
ユニット数	1 個
レンズマウントの種類	ウォールマウント
互換デバイス	ホームシアター
付属品総数	2
保証タイプ	限定保証
同梱商品	ホワイトインウォールスピーカー2個、ホワイトグリル2個、段ボール取り付けテンプレート1個。
周波数応答	20 KHz
品目の寸法（D x W x H）	8.9奥行き x 25.7幅 x 36.1高さ cm
商品の推奨用途	サラウンドサウンドシステム用
商品の用途	湿気の多い屋内/屋外での配置。
商品の追加説明1	壁内デザイン
商品の重量	2.5 キログラム
商品外装素材	アルミニウム
回路数	2
型番	RC85i
最大レンジ	7 メートル
最大出力	100 ワット
梱包タイプ	スタンダードパッケージング
無線タイプ	Bluetooth
管理方法	遠隔
車両の種類と互換性がある	乗用車
通信・接続インターフェース	AUX
防水	FALSE
防水タイプか否か	防水
電気	はい
電源のタイプ	電源コード

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Sold byAmazon SamoaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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RC85I IN-WALL LDSPKR

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