Short answer: the Polk Audio Atrium 6 for better sound quality, the Polk Audio Atrium 4 for the lower price, though neither ranks well in its class. The Polk Audio Atrium 6 ranks #11 of 15 outdoor speakers, rated 2.7/5, at $295. The Polk Audio Atrium 4 ranks #12, rated 2.6/5, at $165, $130 cheaper. Both are rated below 3.0/5 among the 15 outdoor speakers, so if sound quality matters, look higher up that list instead.
Why pick the Polk Audio Atrium 6: The larger Atrium sibling of the measured Atrium 4, with a 5.25” woofer and a 1” aluminum dome tweeter in an all-weather cabinet with a Power Port for deeper bass, rated to 50Hz. Watch for: 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.
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.
Buy the Polk Audio Atrium 6 if sound quality matters more than the price. Buy the Polk Audio Atrium 4 if the price matters more than sound quality.
About the ratings: the Polk Audio Atrium 6’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 2.3 to 3.1, 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 6 | Polk Audio Atrium 4 | |
|---|---|---|
| Price | $295.00 per pair | $165.00 per pair |
| Ranked | #11 of 15 in Outdoor Speakers Estimated | #12 of 15 in Outdoor Speakers |
| Drivers | 1” aluminum dome tweeter, 5.25” woofer | 4.5” (114mm) mineral-filled polymer cone woofer, 0.75” (19mm) anodized aluminum dome tweeter with neodymium magnet |
| Frequency Response | 50Hz - 27kHz (manufacturer specified) | - |
| Sensitivity | 90dB (manufacturer specified) | 89dB |
| Impedance | 8 ohms nominal (manufacturer specified) | 8 ohms |
| Woofer Cabinet | ported | - |
| Dimensions | 11.7”H x 7.7”W x 8.9”D (297 x 195 x 225 mm) | 8.6”H x 5.7”W x 6.6”D (219 x 144 x 168 mm) |
| Weight | 5.3 lbs (2.4 kg) each | 3.6 lbs (1.63 kg) |
| DIY Kit | No | - |
| Configuration | - | Passive 2-way |
| Recommended Power | - | 10-80W |
| Enclosure | - | Sealed all-weather Mineral-filled polypropylene |
| 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 |
Related Speaker Comparisons
More worthwhile head-to-heads for Polk Audio Atrium 6:
- Polk Audio Atrium 6 vs Polk Audio Atrium 5
- RSL Outsider II vs Polk Audio Atrium 4
- OSD Audio AP650 vs Polk Audio Atrium 4
- Polk Audio Atrium 4 vs JBL Control 25T
- Polk Audio Atrium 4 vs Polk Audio Atrium 5
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 6: $295.00 per pair Estimated Amazon eBay
Same family: the Polk Audio Atrium 4 (smaller outdoor, ranked lower, rated 2.6/5) and the Polk Audio Atrium 5 (smaller outdoor, ranked lower, estimated 2.6/5).
Pros: The larger Atrium sibling of the measured Atrium 4, with a 5.25” woofer and a 1” aluminum dome tweeter in an all-weather cabinet with a Power Port for deeper bass, rated to 50Hz. Sensitivity is 90dB and Polk’s Speed-Lock bracket makes wall mounting quick.
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. Like any outdoor speaker, bass thins out away from walls.
Full Polk Audio Atrium 6 review and specifications →
| DIY Kit | No |
|---|---|
| Dimensions | 11.7”H x 7.7”W x 8.9”D (297 x 195 x 225 mm) |
| Drivers | 1” aluminum dome tweeter, 5.25” woofer |
| Frequency Response | 50Hz - 27kHz (manufacturer specified) |
| Impedance | 8 ohms nominal (manufacturer specified) |
| Sensitivity | 90dB (manufacturer specified) |
| Weight | 5.3 lbs (2.4 kg) each |
| Woofer Cabinet | ported |
- 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
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 5
- 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