Introduction
The Polk Audio Atrium 4 Outdoor Loudspeakers are designed to deliver high-fidelity sound in various outdoor environments. These speakers are engineered for all-weather durability and feature a compact design suitable for diverse installations. This manual provides essential information for the proper setup, operation, maintenance, and troubleshooting of your Atrium 4 speakers.
Key Features
- All-Weather Certification: Engineered to withstand extreme temperatures and heavy rain, meeting or exceeding military specifications for environmental endurance.
- Compact Design: Features a 4.5-inch Dynamic Balance polypropylene woofer and a 0.75-inch anodized aluminum dome tweeter, providing powerful sound from a small footprint.
- Broad Sound Coverage: A steeply-angled baffle design maximizes mid- and high-frequency dispersion over large outdoor areas.
- Speed-Lock Mounting System: Facilitates easy, one-handed installation with anti-slip angle setting, allowing for vertical or horizontal mounting.
- Easy Connectivity: Equipped with gold-plated 5-way binding posts for secure and dependable wired connections to any modern AVR or amplifier.
What's in the Box
Verify that all items listed below are included in your package:
- 2 x Polk Audio Atrium 4 Outdoor Speakers (White)
- 2 x Speed-Lock Mounting Brackets (pre-installed)
- 1 x Owner's Manual
- 1 x Online Product Registration Card
- 1 x Polk Audio Brochure

Setup & Installation
The Atrium 4 speakers feature the proprietary Speed-Lock Mounting System for straightforward installation. They can be mounted vertically or horizontally to suit your desired sound projection.
Mounting the Speakers
- Select Mounting Location: Choose a location that provides optimal sound coverage for your outdoor space. Consider mounting by a pool, on a deck, or under a pavilion.
- Install Mounting Bracket: The Speed-Lock bracket is designed for one-handed installation. Secure the bracket to your chosen surface (wall, ceiling, or beam) using appropriate screws (not included).
- Attach Speaker: Click the speaker into the installed bracket. The anti-slip design allows for precise angle setting.
- Tighten Knobs: Securely tighten the knobs on the sides of the speaker to lock it into position and prevent movement.

Wiring Connections
The Atrium 4 speakers utilize gold-plated 5-way binding posts for reliable audio connections.
- Prepare Speaker Wire: Use 16-gauge weatherproof speaker wire for runs up to 50 feet. Strip approximately 1/2 inch of insulation from the ends of the wire.
- Connect to Speakers: Unscrew the binding posts on the back of the speaker. Insert the red wire into the red (+) terminal and the black wire into the black (-) terminal. Tighten the binding posts to secure the wires.
- Connect to Amplifier/Receiver: Connect the other end of the speaker wires to the corresponding left and right speaker outputs on your amplifier or receiver, ensuring correct polarity (red to red, black to black).

Operating Instructions
Once properly installed and wired, your Polk Audio Atrium 4 speakers are ready for use. Connect your audio source to your amplifier/receiver and enjoy high-quality outdoor sound.
Audio Playback
- Ensure your amplifier/receiver is powered on and set to the correct input source.
- Adjust the volume on your amplifier/receiver to your desired listening level.
- The speakers' broad coverage baffle design ensures wide sound dispersion, filling small to medium outdoor spaces effectively.

Dynamic Balance Technology
Polk's Dynamic Balance technology optimizes material selection and construction to eliminate unwanted resonance, resulting in pure, distortion-free sound, even at high volumes.

Maintenance & Durability
The Polk Audio Atrium 4 speakers are built for all-weather performance and require minimal maintenance.
All-Weather Certification
Atrium Series speakers exceed baseline industrial and military specifications for environmental endurance, including ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, and Mil-Std 883 Method 1009.8 for salt and corrosion. This certification ensures the speakers can withstand extreme temperatures and heavy rains.

Cleaning and Care
- Wipe the speaker cabinets with a soft, damp cloth as needed to remove dirt or debris.
- Avoid using harsh chemicals or abrasive cleaners, as these may damage the finish or components.
- The durable, mineral-filled polypropylene cabinet and aluminum grilles with stainless steel and brass hardware are designed to resist rust and withstand seasonal changes.

Troubleshooting
If you encounter issues with your Polk Audio Atrium 4 speakers, refer to the following common solutions:
- No Sound: Ensure the amplifier/receiver is powered on, the correct input is selected, and all speaker wire connections are secure and correctly polarized. Check the volume level on your amplifier.
- Distorted Sound: Reduce the volume level on your amplifier/receiver. Check speaker wire connections for any loose strands or short circuits. Ensure the amplifier's power output is within the recommended range for the speakers (10-80 watts per channel).
- Uneven Sound: Verify that both speakers are connected and receiving a signal. Adjust speaker placement and angle to optimize sound dispersion.
Specifications
| Feature | Detail |
|---|---|
| Driver Complements | Mid/Woofer: 1 - 4-1/2" Dynamic Balance Mineral Filled Polymer Cone with rubber surround Tweeter: 1 - 3/4" Dynamic Balance Anodized Aluminum Dome Tweeter with Neodymium motor structure |
| Overall Frequency Response | 75Hz-25kHz |
| Nominal Impedance | 8 ohms |
| Recommended Amplifier Power | 10-80 watts per channel |
| Efficiency | 89 dB |
| Inputs | Gold-plated 5-way Binding Posts |
| Cabinet Size (H x W x D) | 8-5/8" H x 5-11/16" W x 6-11/16" D (21.91cm H x 14.45cm W x 16.99cm D) |
| Mounting Options | 180-degree Speed-Lock Mounting System |
| Enclosure Type | Sealed |
| Product Weight | 3.60 lbs. (1.63kgs) |
| Water Resistance Level | Waterproof |
| Model Number | AM4088-A |
| UPC | 747192118808 |
Official Product Videos
Polk Audio Atrium 4 All Weather Outdoor Speakers
This video provides an overview of the Polk Audio Atrium 4 All-Weather Outdoor Speakers, showcasing their features and suitability for various outdoor environments.
Polk Audio Atrium 4 Outdoor Speakers
This video offers a closer look at the Polk Audio Atrium 4 Outdoor Speakers, demonstrating their design and potential applications in an outdoor setting.
Warranty & Support
Warranty Information
Polk Audio Atrium 4 speakers come with a 5-year parts and labor warranty for the original purchaser. To ensure a valid warranty, speakers must be purchased from an Authorized Polk Audio home or car loudspeaker Dealer (such as Amazon.com).
- The warranty is not transferable and applies only to the original purchaser.
- Products purchased from private individuals are considered "used" and do not carry a factory warranty.
- The warranty is void if the serial number of the speaker has been removed or defaced.
Customer Support
For any questions regarding your warranty coverage, service needs, or product inquiries, please contact Polk Audio Customer Service:
- Phone: 1-800-377-7655







