each Rectangular 3-way In-Wall/ceiling cut out 48.9 x 18.4 cm 

TCi Series In-Wall/In-Ceiling Loudspeakers are the performance alternative for custom installed sound systems. They give you Total Control over your Total Custom built-in audio installation with superior sound and superior user controls. Mix and match TCi In-Wall/In-Ceiling Loudspeakers with Polk Audio RTi Series loudspeakers to create a voice-matched home theater system boasting life-like surround sound without the space requirements of traditional speaker systems (RTi front stage, TCi rear surrounds for example). 

TCi Features: 
Sold singly (packaged one per box). Single units can be used for center channel applications in stealth installs! 
Dynamic Balance™ polymer composite drivers for smooth wide-range response with low distortion. 
Aimable 1" silk dome tweeter with neodymium magnet for clear, detailed highs and direct control; excellent imaging even for off-axis listening positions. 
Wide dispersion design for uniform sound-coverage throughout even large rooms. 
Extraordinary bass response from an in-wall loudspeaker thanks to Polk’s patented Power Port bass venting system. It's "designed in" to extend deep bass efficiency and definition. Infinite Baffle Tuning uses the virtual enclosure of in-wall space for superior bass response, and available In-wall Performance Enclosures give exact volume enclosure performance in pre-build installations. 
Durable, moisture resistant materials, including Butyl Rubber surrounds, for safe use in kitchen, bath & sauna. 
Paintable, powder-coated Aluminum Grilles allow TCi Series speakers to virtually disappear in your room! 
Conveniently accessible front panel controls: Tweeter Level Switch offers flat and –3db selection for more sound control, and Wall Distance Toggle Switch flattens frequency response when installed near a corner or adjacent wall. 
Turn the Rotating Cams,
and the speaker is solidly installed.
Easy as 1-2-3.

Installation is easy as 1-2-3: cut one hole, feed the wires, and simply drop the speaker in. Rotating Cams secure the speaker safely with no extra assembly or mess. 
In-wall Performance Enclosures are available for sound isolating purposes in pre-build installations. Use AW0267-B with TC265i. 
Pre-Construction Brackets available for new construction or major renovation. Use PB LC/TC 265 (Polk Part # AW0266-A). 
Perfectly timbre-matched to the whole Polk Audio RTi Series of high performance loudspeakers.