Short answer: the Polk Audio Atrium 4, though neither ranks well in its class. Both are rated 2.6/5 for sound quality (#12 and #13 of 15 outdoor speakers), and the Polk Audio Atrium 4 costs $165 against $229 for the Polk Audio Atrium 5, with sound quality a draw, the lower price decides it. Both are rated below 3.0/5 among the 15 outdoor speakers, so if sound quality matters, look higher up that list instead.
What the Polk Audio Atrium 4 does well: Extremely compact, lightweight (1.63 kg), and affordable outdoor pair with Speed-Lock quick mounting bracket. Watch for: Small 4.5” driver restricts low-end performance; bass extension drops steeply past 98Hz (-6dB) with little acoustic energy below 100Hz.
The case for the Polk Audio Atrium 5: A step up from the measured Atrium 4 in Polk’s all-weather outdoor range, with a 5” woofer and 0.75” tweeter in a weather-resistant cabinet with Polk’s Speed-Lock bracket for quick mounting. The catch: No independent measurements yet, so its tonal balance and directivity can’t be compared directly with measured speakers; the rating is estimated from the measured Atrium 4, which had an uneven tonal balance.
Buy the Polk Audio Atrium 4. Both are rated the same for sound quality, and it costs $64 less than the Polk Audio Atrium 5.
About the ratings: the Polk Audio Atrium 5’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 2.2 to 3.0, so this verdict could change once it is measured.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Polk Audio Atrium 4 | Polk Audio Atrium 5 | |
|---|---|---|
| Price | $165.00 per pair | $229.00 per pair |
| Ranked | #12 of 15 in Outdoor Speakers | #13 of 15 in Outdoor Speakers Estimated |
| Drivers | 4.5” (114mm) mineral-filled polymer cone woofer, 0.75” (19mm) anodized aluminum dome tweeter with neodymium magnet | 0.75” tweeter, 5” woofer |
| Configuration | Passive 2-way | - |
| Sensitivity | 89dB | 90dB (manufacturer specified) |
| Impedance | 8 ohms | 8 ohms nominal (manufacturer specified) |
| Recommended Power | 10-80W | - |
| Enclosure | Sealed all-weather Mineral-filled polypropylene | - |
| Dimensions | 8.6”H x 5.7”W x 6.6”D (219 x 144 x 168 mm) | 10.3”H x 6.9”W x 8.1”D (262 x 175 x 206 mm) |
| Weight | 3.6 lbs (1.63 kg) | 4.6 lbs (2.1 kg) each |
| Bass Extension (-3dB) | 112.8Hz (measured, Audio Science Review) | - |
| Bass Extension (-6dB) | 98.1Hz (measured, Audio Science Review) | - |
| Bass Extension (-10dB) | 74.7Hz (measured, Audio Science Review) | - |
| Spinorama Preference Score | 1.46 | - |
| Spinorama Preference Score with Perfect Sub | 5.10 | - |
| Frequency Response | - | 60Hz - 25kHz (manufacturer specified) |
| DIY Kit | - | No |
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Prices on this page were last checked October 7, 2026 at 9:25 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
Polk Audio Atrium 4: $165.00 per pair Amazon eBay
Same family: the Polk Audio Atrium 5 (larger outdoor, ranked lower, estimated 2.6/5) and the Polk Audio Atrium 6 (larger outdoor, ranked higher, estimated 2.7/5).
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) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Polk Audio Atrium 4 vs Polk Audio Atrium 6
- Polk Audio Atrium 4 vs OSD Audio AP650
- Polk Audio Atrium 4 vs JBL Control 25-1
- Polk Audio Atrium 4 vs JBL Control 29AV-1
- Polk Audio Atrium 4 vs JBL Control 25T
- Polk Audio Atrium 4 vs JBL Control X
- Polk Audio Atrium 4 vs JBL Stage XD-5
- Polk Audio Atrium 4 vs RSL Outsider II
- See all 13 comparisons
Polk Audio Atrium 5: $229.00 per pair Estimated Amazon eBay
Same family: the Polk Audio Atrium 4 (smaller outdoor, ranked higher, rated 2.6/5) and the Polk Audio Atrium 6 (larger outdoor, ranked higher, estimated 2.7/5).
Pros: A step up from the measured Atrium 4 in Polk’s all-weather outdoor range, with a 5” woofer and 0.75” tweeter in a weather-resistant cabinet with Polk’s Speed-Lock bracket for quick mounting. Rated to 60Hz with 90dB sensitivity, so it plays loud from a modest amplifier.
Cons: No independent measurements yet, so its tonal balance and directivity can’t be compared directly with measured speakers; the rating is estimated from the measured Atrium 4, which had an uneven tonal balance. Bass is limited outdoors without a wall or eave to reinforce it.
Full Polk Audio Atrium 5 review and specifications →
| DIY Kit | No |
|---|---|
| Dimensions | 10.3”H x 6.9”W x 8.1”D (262 x 175 x 206 mm) |
| Drivers | 0.75” tweeter, 5” woofer |
| Frequency Response | 60Hz - 25kHz (manufacturer specified) |
| Impedance | 8 ohms nominal (manufacturer specified) |
| Sensitivity | 90dB (manufacturer specified) |
| Weight | 4.6 lbs (2.1 kg) each |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons