Polk Atrium4 Outdoor Speakers – Pair
The Polk Atrium4 is designed for both home users and trade professionals seeking compact yet high–performance outdoor audio. Ideal for patios, decks and smaller gardens, it delivers impressively full-range sound from a sleek, weatherproof enclosure.
Key Benefits
- Exceptional sonic performance from a compact form—4.5″ polypropylene woofer and ¾″ aluminium dome tweeter combine to deliver a rich, balanced audio experience
- True all–weather durability, exceeding military–grade standards (ASTM D5894, MIL–STD–810 immersion, MIL–STD–883 salt/corrosion)
- Speed–Lock™ bracket system enables secure, one–handed mounting and easy orientation adjustment
- Long-term reliability backed by a 5–year warranty covering both cabinets and drivers
- Paintable grilles and two finish options (black or white) ensure seamless integration into any outdoor area
Design and Build Quality
The Atrium4 features a mineral–filled polypropylene cabinet with robust internal bracing and a durable powder–coated aluminium grille. The woofer employs polypropylene with a butyl-rubber surround, while the tweeter is a neodymium–motor aluminium dome with a rubber surround—materials chosen for clarity, power handling and resilience. All fasteners are stainless steel or brass, ensuring long-term corrosion resistance.
Key Technologies
- Dynamic Balance® cones: Engineered to minimise distortion and “artifacts”, providing natural sound quality at all listening levels.
- Klippel–Optimised motor system: Precision for accurate, distortion–free audio reproduction.
- Speed–Lock™ mounting: Rapid, tool–free installation with secure 180° swivel positioning.
- All–Weather Certification: Exceeds UV, immersion and salt–fog military specs for outstanding outdoor reliability.
Specifications
| Specification | Details |
|---|
| Power Source | Corded (passive) |
| Motor Type | Passive, requires external amplifier |
| Driver Type | 4.5″ polypropylene woofer, 0.75″ aluminium dome tweeter |
| Impulse Speaker Type | 2–Way |
| Impedance | 8 Ω nominal |
| Recommended Amplifier Power | 10–80 W per channel |
| Frequency Response | 75 Hz–25 kHz |
| Sensitivity | 89 dB (1 W/1 m) |
| Mounting | Speed–Lock™ 180° swivel bracket (horizontal/vertical) |
| Cabinet | Mineral–filled polypropylene |
| Grille/Bracket | Powder–coated aluminium, paintable |
| Dimensions (H×W×D) | 219 × 144 × 169 mm (8.6″×5.7″×6.7″) |
| Weight | 1.63 kg (3.6 lb) each |
| Warranty | 5 Years (cabinet & driver) |
Performance and User Experience
Real–world usage reports and reviews (e.g. Crutchfield) praise the Atrium4 for delivering clear vocals, impactful bass and solid outdoor coverage from a compact form. The 89 dB sensitivity means they can deliver impressive output even with modest amplifiers, suitable for garden gatherings or casual listening. Users appreciate the ease of installation and weatherproof performance over the years.
Q&A Section
- Can these be used indoors? Yes—though designed for outdoors, their sealed cabinet makes them suitable for indoor use too.
- Are they wall- or ceiling-mountable? Yes—Speed–Lock bracket accommodates both horizontal and vertical mounting positions.
- Do they include cables? No—you’ll need your own speaker wire and amplifier capable of driving 8 Ω speakers.
- Can I paint them? Yes—the grille and housing come in paintable black or white finishes.
- Are they suitable for marine use? While certified for salt–fog and immersion standards, these are not marine–grade; avoid direct seawater contact.
- What amplifier power should I use? Between 10–80 W per channel. A 20–50 W amp typically delivers optimal balance of clarity and volume.
- How long is the warranty? Five years for both cabinets and drivers—one of the best in the outdoor audio category.
