Polk Atrium 8 SDI is a single Black passive loudspeaker designed for outdoor installations. Its dual-input design can reproduce both left and right audio channels from one cabinet, or work as one channel in a larger stereo system when set and connected as instructed in the manual.

• One 6.5-inch dual-voice-coil woofer and two 1-inch anodized aluminium dome tweeters.
• Single/dual-input switch and two pairs of gold-plated 5-way binding posts.
• Water-resistant PowerPort bass venting and a mineral-filled polypropylene cabinet.
• Speed-Lock mounting bracket supports horizontal or vertical positioning and aiming.
• Compatible with 8-ohm amplifier outputs; external amplification is required.
• Manufacturer total frequency response: 45 Hz–27 kHz, with sensitivity of 91 dB at 1 W/1 m.

Includes one Black Atrium 8 SDI speaker with its mounting bracket and knobs. Additional speakers, an amplifier and speaker wire are not included. Choose suitable mounting fasteners for the surface and follow the owner's manual for safe installation and wiring.