The Polk Audio Atrium 4 ranks #11 out of 13 total Outdoor Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: Polk
Prices on this page were last checked October 4, 2026 at 9:58 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#11 Polk Audio Atrium 4: $117.00 per pair Amazon eBay
Pros: Extremely compact, lightweight (1.63 kg), and affordable outdoor pair with Speed-Lock quick mounting bracket. Clean build quality that easily survives harsh rain and sun exposure. Smooth dispersion pattern (+60/-70 degrees horizontal). Measured bass extension of 112.8Hz (-3dB).
Cons: Small 4.5” driver restricts low-end performance; bass extension drops steeply past 98Hz (-6dB) with little acoustic energy below 100Hz. Notable mid-treble shelf gives it a forward, bright presentation and yields a low 1.46 preference score.
How it compares: Just above it: OSD Audio AP650 - $83 more, 1Hz higher bass extension (-3dB). Just below it: JBL Control 25-1 - $353 more, 1Hz higher bass extension (-3dB).
| Bass Extension (-10dB) | 74.7Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 112.8Hz (measured, Audio Science Review) |
| Bass Extension (-6dB) | 98.1Hz (measured, Audio Science Review) |
| Configuration | Passive 2-way |
| Dimensions | 8.6”H x 5.7”W x 6.6”D (219 x 144 x 168 mm) |
| Drivers | 4.5” (114mm) mineral-filled polymer cone woofer, 0.75” (19mm) anodized aluminum dome tweeter with neodymium magnet |
| Enclosure | Sealed all-weather Mineral-filled polypropylene |
| Impedance | 8 ohms |
| Recommended Power | 10-80W |
| Sensitivity | 89dB |
| Spinorama Preference Score | 1.46 |
| Spinorama Preference Score with Perfect Sub | 5.10 |
| Weight | 3.6 lbs (1.63 kg) |
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