Short answer: the Polk Audio Atrium 4, if you are buying new. The Revel M55XC ranks higher than it (#5 vs #11 of 13 outdoor speakers, 3.6/5 vs 2.6/5) but is discontinued, so only consider it used; the Polk Audio Atrium 4 is still sold new at $117.
The Revel M55XC is the more accurate option. Audio Science Review measurements demonstrate a 3.36 preference score that leaps to 6.89 with a subwoofer. Its measured preference score, a predictor of how neutral it sounds, is 3.36 against 1.46 for the Polk Audio Atrium 4. Watch for: Compact sealed enclosure limits bass output, with -6dB extension at 90.8Hz and rapid low-frequency roll-off below 100Hz.
Why pick the Polk Audio Atrium 4: Extremely compact, lightweight (1.63 kg), and affordable outdoor pair with Speed-Lock quick mounting bracket. The catch: Small 4.5” driver restricts low-end performance; bass extension drops steeply past 98Hz (-6dB) with little acoustic energy below 100Hz.
Buy the Polk Audio Atrium 4 if you want one new; the Revel M55XC is discontinued, so only look for it used.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Revel M55XC | Polk Audio Atrium 4 | |
|---|---|---|
| Price | $420 per pair Discontinued | $117.00 per pair |
| Ranked | #5 of 13 in Outdoor Speakers | #11 of 13 in Outdoor Speakers |
| Drivers | 5.25” carbon-infused polypropylene woofer, 1” aluminum dome tweeter with Acoustic Lens waveguide | 4.5” (114mm) mineral-filled polymer cone woofer, 0.75” (19mm) anodized aluminum dome tweeter with neodymium magnet |
| Configuration | Passive 2-way | Passive 2-way |
| Sensitivity | 86.5dB | 89dB |
| Impedance | 8 ohms | 8 ohms |
| Recommended Power | 20-70W | 10-80W |
| Enclosure | Sealed, IP56 weather-resistant | Sealed all-weather Mineral-filled polypropylene |
| Dimensions | 9.8”H x 7.4”W x 7.1”D (248 x 188 x 181 mm) | 8.6”H x 5.7”W x 6.6”D (219 x 144 x 168 mm) |
| Weight | 7.5 lbs (3.4 kg) | 3.6 lbs (1.63 kg) |
| Bass Extension (-3dB) | 112.8Hz (measured, Audio Science Review) | 112.8Hz (measured, Audio Science Review) |
| Bass Extension (-6dB) | 90.8Hz (measured, Audio Science Review) | 98.1Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 67.4Hz (measured, Audio Science Review) | 74.7Hz (measured, Audio Science Review) |
| Spinorama Preference Score | 3.36 | 1.46 |
| Spinorama Preference Score with Perfect Sub | 6.89 | 5.10 |
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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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The Two Speakers In Full
Revel M55XC: $420 per pair Discontinued eBay
Pros: Audio Science Review measurements demonstrate a 3.36 preference score that leaps to 6.89 with a subwoofer. Smooth off-axis response and tight directivity matching through the crossover handover thanks to Revel’s Acoustic Lens waveguide. Rugged IP56 weather resistance and included InvisiBall mounting hardware make installation straightforward. Measured bass extension of 112.8Hz (-3dB).
Cons: Compact sealed enclosure limits bass output, with -6dB extension at 90.8Hz and rapid low-frequency roll-off below 100Hz. Modest 86.5dB sensitivity means it requires a capable amplifier for open outdoor spaces. Discontinued.
Full Revel M55XC review and specifications →
| Bass Extension (-10dB) | 67.4Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 112.8Hz (measured, Audio Science Review) |
| Bass Extension (-6dB) | 90.8Hz (measured, Audio Science Review) |
| Configuration | Passive 2-way |
| Dimensions | 9.8”H x 7.4”W x 7.1”D (248 x 188 x 181 mm) |
| Drivers | 5.25” carbon-infused polypropylene woofer, 1” aluminum dome tweeter with Acoustic Lens waveguide |
| Enclosure | Sealed, IP56 weather-resistant |
| Impedance | 8 ohms |
| Recommended Power | 20-70W |
| Sensitivity | 86.5dB |
| Spinorama Preference Score | 3.36 |
| Spinorama Preference Score with Perfect Sub | 6.89 |
| Weight | 7.5 lbs (3.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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.
Full Polk Audio Atrium 4 review and specifications →
| 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) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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