Atrium8 SDI

High Performance All Weather Outdoor Loudspeaker with Dual Tweeters and PowerPort Bass Venting

  • Engineered with a dual voice coil, Dynamic Balance® aerated polypropylene cone with rubber surround for greater power handling and better efficiency
  • All-weather certified and water-resistant to withstand the worst elements
  • Patented water-resistant PowerPort bass venting efficiently adds 3dB of big, realistic, musical bass output
  • Single/dual input switch
  • 249.95 Each
Add to Cart
  • 249.95 Each
  • Free ground shipping on all orders

Flagship All Weather Loudspeaker

Single/Dual input switch and dual tweeter array that lets you work the speaker as a single high/performance stereo loudspeaker, or L/R speaker in a high performance stereo pair. It’s time to get that indoor sound you love - all from an outdoor loudspeaker you can put anywhere around your home.

Dynamic Balance Technology

This patented technology analyzes the speaker’s entire electro-acoustic and mechanical system for improved material selection and more efficient geometry.

All-Weather Certified and Water-Resistant

Built to withstand the worst elements—salt-fog, UV, extreme temps or heavy rains, you name it.

Durable Construction

Aluminum grilles and bracket, with stainless steel and brass hardware means no rust—ever.

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Tech Specs


  • Total Pieces


  • Cabinet Warranty
    5 years
  • Drivers Warranty
    5 years
  • Original Purchaser Only

Shipping Cartons

  • Carton 1
    13.5 lbs (6.12 kg)

All Weather Outdoor Loudspeaker

  • Qty Included
  • Availability
  • Orientation
    • Horizontal
    • Vertical
  • Height
    12.875" (32.7 cm)
  • Width
    8.5" (21.59 cm)
  • Depth
    9.188" (23.34 cm)
  • Weight
    9.7 lbs (4.4 kg)
  • Front Array Driver Enclosure Type
    Durable, mineral-filled polypropylene cabinet design
  • Front Array Driver Complement
    • (1)  6.5" (16.51 cm) d (Round) Dual voice coil driver with Dynamic Balance aerated polypropylene cone with rubber surround - Mid/Woofer
    • (2)  1" (2.54 cm) d (Round) Anodized aluminum dome with neodymium motor structure - Tweeter

Audio Quality

  • Total Frequency Response
    45 Hz → 27,000 Hz
  • Nominal Impedance
    8 ohms
  • Sensitivity (1 watt @ 1 meter)
    91 dB

Swivel Wall/Ceiling Mount Mount

  • Mounting Type
    180° Speed-Lock mounting system with Keyhole Slots
  • Available Orientations
    • Horizontal
    • Vertical


  • Audio Inputs
  • Speaker Inputs
    (2) Pair of Switchable single / dual 5-way Binding Posts - Gold-Plated
Q & A

Here's Where to Find Your Nearest Polk Dealer