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Polk Audio - Atrium 4 - All-Weather Outdoor Loudspeaker (Pair) is available to buy in increments of 1

Polk Audio - Atrium 4 - All-Weather Outdoor Loudspeaker (Pair)

Polk Audio - Atrium 4 - All-Weather Outdoor Loudspeaker (Pair)

Big Fidelity, Small Speaker

The Compact Atrium4 loudspeaker produces high fidelity sound quality anywhere you want great sound. It's small size makes it ideal for tight, out-of-way installations.

Speed Lock Mounting System

Simply mount the bracket and click the speaker into place. Aim it and tighten it down.

Patented Dynamic Balance®

The perfect material performance, eliminating driver and tweeter "artifacts" for more realistic sound reproduction at high and low volume levels.


  • All-weather certified and water-resistant to withstand the worst elements—salt-fog, UV, extreme temps or heavy rains, you name it
  • Speed-Lock Mounting System
  • PowerPort bass venting for deep bass you can feel from the ground up
  • Engineered with Polk’s Dynamic Balance® technology


Product Polk Audio - Atrium 4 - All-Weather Outdoor Loudspeaker (Pair)
Accessories Total Pieces - 1
Cabinet Warranty 5 years
Drivers Warranty 5 years
Original Purchaser Only Yes
Shipping Cartons 1
All-Weather Outdoor Loudspeaker Total Pieces - 2 (Pair)
Height x Width x Depth 8.625" (21.91 cm) x 5.688" (14.45 cm) x 6.688" (16.99 cm)
Weight 3.6 lbs (1.63 kg)
Driver Complement
  • (1) 4.5" (11.43 cm) d (Round) Mid/Woofer - Tweeter
  • (1) 0.75" (1.91 cm) d (Round) Tweeter - Tweeter
Audio Quality
Total Frequency Response 75 Hz → 25 Hz
Nominal Impedence 8 ohms
Sensitivity (1 watt @ 1 meter) 89 dB
Swivel Wall / Ceiling Mount
Mounting Type 180° Speed-Lock mounting system
Available Orientations
  • Horizontal
  • Vertical
External Amplifier
Recommended Amplifier Power Per Channel 10 watts → 80 watts
Audio Inputs
Ethernet Yes
Speaker Inputs (2) Pair of 5-way Binding Posts - Gold-Plated
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