265 RT - Angled Ceiling Mounting - Enclosure Material Suggestions

DrueB
DrueB Posts: 10
in Speakers
5.1 System. I am mounting the 265 RT's as surrounds on an angled ceiling, facing down and across the room. I know that open areas behind the speaker need to be sealed to create a "cabinet" of sorts. What is the best material to install over the studs and behind the speaker? Do I need to seal the top and bottom of the openings behind the speaker, as well, and if so, with what material?
Outlaw Model 976 AV Surround Processor
Outlaw Model 5000 5 Channel Amplifier
Polk LSI 15 Main Speakers
Polk LSIC Center Speaker
Polk 265RT 3 Way In Wall Surrounds
Martin Logan 500 Dynamo Sub
Panasonic TC-P65VT60 65-Inch Plasma
Panasonic DMP-BDT500P Blu-ray
2019 Technics SL 1210 GR Turntable
F117 Ray Samuels Nighthawk Phono Preamp
Ortofon Headshell – LH 2000
Ortofon Bronze MM Cartridge
Blue Jean Interconnects
Blue Jean Speaker Cables
Furman M-8X2 Conditioner
Panamax M4300-PM Conditioner
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  • DrueB
    DrueB Posts: 10
    Never mind...called Polk Tech Support yesterday. No need for enclosures at all...speakers are specifically designed to have open backs. But if it makes you feel better to have them enclosed, enclosures should be 1 cubic foot.
    Outlaw Model 976 AV Surround Processor
    Outlaw Model 5000 5 Channel Amplifier
    Polk LSI 15 Main Speakers
    Polk LSIC Center Speaker
    Polk 265RT 3 Way In Wall Surrounds
    Martin Logan 500 Dynamo Sub
    Panasonic TC-P65VT60 65-Inch Plasma
    Panasonic DMP-BDT500P Blu-ray
    2019 Technics SL 1210 GR Turntable
    F117 Ray Samuels Nighthawk Phono Preamp
    Ortofon Headshell – LH 2000
    Ortofon Bronze MM Cartridge
    Blue Jean Interconnects
    Blue Jean Speaker Cables
    Furman M-8X2 Conditioner
    Panamax M4300-PM Conditioner
    · Share on FacebookShare on Twitter