Polk Audio Atrium 4 Outdoor Speakers
- 4.5 inch woofer, aluminum dome tweeter
- 80 watts maximum power, 8 ohm
- 89 db signal-to-noise ratio
- Waterproof per the specs, rustproof grille
- Speed Lock wall mounting system
- 2 year parts and labor warranty
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact weatherproof pair for patios and outdoor walls. Connectivity fields in the listing conflict, so treat them as passive wired speakers.
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ASIN: B00378KMF0Model: AM4085-A|4Category: Outdoor Speakers
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Styles Available
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Overview
A patio wall or an eave is where a small speaker like this belongs, hung on its stainless and brass hardware. The brackets arrive installed, and the Speed Lock system makes mounting quick.
The reason to buy is a small outdoor pair with rustproof materials and a mounting system that is fast to use. The limit is information: the listing mixes wired, powered and Ethernet wording that cannot all be true.
Who it's for
An outdoor living area with tight mounting space and an amplifier in the house suits this pair. Shoppers who want large bass output or wireless streaming should look elsewhere.
Pros and cons
- Rustproof aluminum grille and bracket
- Mounting brackets pre-installed
- Stainless and brass hardware
- Pair in one order
- Connectivity fields conflict
- Small woofer limits bass
- Needs an external amplifier
- Voice control field is unclear
Performance notes
A polypropylene cone and aluminum dome tweeter share the work in each housing. Polk says Dynamic Balance and Klippel optimization reduce driver artifacts at low and high volume. Bass is limited by the small woofer and open outdoor placement.
Where it stands among outdoor speakers
- #2 most-searched brand and model of the 11 outdoor speakers lines we track (by search demand, not sales).
From the specs of the 15 outdoor speakers we list; not a test result.
Specifications
| Brand | Polk Audio |
|---|---|
| Model | AM4085-A|4 |
| Dimensions & fit | |
| Woofer diameter | 4.5 inches |
| Item dimensions d x w x h | 6.69"D x 5.69"W x 8.63"H |
| Item weight | 3.6 pounds |
| Capacity & performance | |
| Speaker maximum output power | 80 watts |
| Signaltonoise ratio | 89 db |
| Construction & materials | |
| Color | Black |
| Enclosure material | Metal, Plastic |
| Compatibility & installation | |
| Mounting type | Wall Mount |
| Warranty & support | |
| Warranty description | 2 years parts and labor |
| Other details | |
| Speaker type | Outdoor |
| Frequency response | 25 KHz |
| Impedance | 8 ohm |
| Water resistance level | Waterproof |
| Builtin media | 2 Black all-weather speakers, 2 Mounting brackets (installed), Owner's Manual, Online Product Registration card, Polk Audio brochure |
| Number of items | 2 |
Frequently asked questions
Are the Polk Atrium 4 speakers powered or Bluetooth?
The specs say no wireless technology and the connectivity fields list odd items such as Ethernet and HDMI. The description calls them wired speakers, so connect them to an amplifier.
What is in the Atrium 4 box?
Two black all-weather speakers, two mounting brackets that are already installed, an owner's manual, an online product registration card and a Polk brochure.
Are the Atrium 4 speakers weatherproof?
The specs say waterproof, and the description names rustproof aluminum and stainless steel and brass hardware meant for seasonal change.