Are these original speakers?

No, there were speakers long before these existed.

Does it need to be plugged in at all times?

These speakers require speaker wire to be connected to them when being listened to. There is no power cable to be plugged in.

Is this a single speaker or a pair of speakers?

Since this question was asked regarding the Atrium 8 version but Amazon shows it under both the 6 and 8 version, the Atrium 8 version is sold as a single speaker. The Atrium 6 version (and smaller) are sold as pairs.

What is the rms wattage per speaker? I cannot get a straight answer!

Polk claims they will handle up to 125 watts per channel, but with a sensitivity of 91dB 《8 ohm) these speakers get very loud quickly. I have an older Technics H class receiver (100 watts p/ch) & have never pushed over half volume on my pair. Note: I do enjoy cranking it up. With a freq. response of 45 - 27,000Hz, I found a sub wasn't needed. Placement, area & environment ( walls, height, corner availability) make a big difference when installing them correctly, but wattage shouldn't be a concern. These speakers are a great buy for the price.

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Description

🌟 Elevate your outdoor soundscape with military-grade durability and crystal-clear power!

EFFORTLESS INSTALLATION - Innovative speed-lock mounting system enables secure, one-handed setup even in tricky spots—get your vibe going fast.
WIDE AREA SOUND COVERAGE - Steeply-angled baffle design maximizes mid and high-frequency dispersion, filling large outdoor spaces with rich sound.
BUILT TO BRAVE THE ELEMENTS - Exceeds military & industrial standards for salt, corrosion, and immersion resistance—your sound system that laughs at weather.
SEAMLESS BLUETOOTH CONNECTIVITY - Wirelessly stream from laptops, smartphones, or PCs with robust Bluetooth tech—cut the cords, not the quality.
CRYSTAL CLEAR HIGHS RAIN OR SHINE - Anodized aluminum tweeter domes deliver smooth, broad high-frequency range up to 20kHz for immersive outdoor audio.

The Polk Audio Atrium 8SDI is a rugged, 125W outdoor speaker engineered to withstand extreme environmental conditions including salt fog and immersion. Featuring anodized aluminum tweeters for pristine highs and a wide-dispersion baffle design, it delivers immersive sound across large outdoor areas. With a user-friendly speed-lock mounting system and Bluetooth connectivity, it combines professional-grade durability with modern convenience for seamless outdoor audio experiences.

Specifications

Mounting Type	Floor Standing
Model Name	ATRIUM8B
Speaker Type	Outdoor
Special Feature	Radio
Recommended Uses For Product	Military,Outdoor
Compatible Devices	Laptop, Personal Computer, Smartphone
Surround Sound Channel Configuration	2.0
Colour	Black
Included Components	Mounting Bracket
Product Dimensions	23.4D x 21.6W x 32.8H Centimeters
Item Weight	4.4 kg
Impedance	8 Ohm
Is Waterproof	TRUE
Maximum Range	10 metres
Number of Items	1
Control Method	Voice
Wireless Communication Technology	Bluetooth
Speaker Size	6.5 Inches
Power Source	ac
Woofer Diameter	6.5 Inches
Tweeter Diameter	1 Inches
Vehicle Service Type	Car
Water Resistance Level	Water Resistant
Customer Package Type	Standard Packaging
Number of Batteries	1 Lithium Ion batteries required.
Audio Driver Type	Dynamic Driver
Audio Driver Size	6.5 Inches
Subwoofer Connectivity Technology	Wired
Series number	8
UPC	747192118891
Style	Atrium 8
Global Trade Identification Number	00747192118891
Manufacturer	Polk Audio
Model	AM8085-A
Model Year	2014
Batteries	1 Lithium Ion batteries required.
Item model number	AM8085-A
Special Features	Radio
Aspect Ratio	Unknown
Audio input compatible with the item	Auxiliary
Speakers Nominal Output Power	125 Watts
Noise Level	88 dB
Speaker amplification type	Active
Speaker connectivity	Wired
Audio Wattage	125 Watts
Wattage	2
Batteries Included	No
Batteries Required	No
Does it contain liquid?	No
Includes Rechargeable Battery	No
Includes remote	No
Item Weight	4 kg 400 g

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