Short answer: the OSD Audio AP650, though neither ranks well in its class. It ranks #10 of 13 outdoor speakers by sound quality, rated 2.9/5, at $199.99. The Polk Audio Atrium 4 ranks #11, rated 2.6/5, at $117, $82.99 cheaper, a saving that is not big enough to make up the sound-quality gap. Both are rated below 3.0/5 among the 13 outdoor speakers, so if sound quality matters, look higher up that list instead.
The OSD Audio AP650 is the more accurate, deeper-bass pick. Affordable $200/pair price with a solid 6.5” woofer. Its measured preference score, a predictor of how neutral it sounds, is 2.12 against 1.46 for the Polk Audio Atrium 4. Its bass reaches about 95.2Hz before falling 3dB, against 112.8Hz for the Polk Audio Atrium 4. The catch: Preference score is 2.12 (5.30 with sub) due to notable mid-frequency irregularities and uneven directivity through the crossover handover.
What the Polk Audio Atrium 4 does well: 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 OSD Audio AP650. It is rated higher for sound quality, and the $82.99 saving on the Polk Audio Atrium 4 is not enough to make up the difference.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| OSD Audio AP650 | Polk Audio Atrium 4 | |
|---|---|---|
| Price | $199.99 per pair | $117.00 per pair |
| Ranked | #10 of 13 in Outdoor Speakers | #11 of 13 in Outdoor Speakers |
| Drivers | 6.5” polypropylene cone woofer, 1” silk dome tweeter | 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 | 90dB | 89dB |
| Impedance | 8 ohms | 8 ohms |
| Power Handling | 150W | - |
| Enclosure | Sealed composite IPX6 all-weather | Sealed all-weather Mineral-filled polypropylene |
| Dimensions | 12”H x 8”W x 8”D (305 x 203 x 203 mm) | 8.6”H x 5.7”W x 6.6”D (219 x 144 x 168 mm) |
| Weight | 8.6 lbs (3.9 kg) | 3.6 lbs (1.63 kg) |
| Bass Extension (-3dB) | 95.2Hz (measured, Audio Science Review) | 112.8Hz (measured, Audio Science Review) |
| Bass Extension (-6dB) | 74.7Hz (measured, Audio Science Review) | 98.1Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 48.3Hz (measured, Audio Science Review) | 74.7Hz (measured, Audio Science Review) |
| Spinorama Preference Score | 2.12 | 1.46 |
| Spinorama Preference Score with Perfect Sub | 5.30 | 5.10 |
| Recommended Power | - | 10-80W |
Related Speaker Comparisons
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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
OSD Audio AP650: $199.99 per pair Amazon eBay
Pros: Affordable $200/pair price with a solid 6.5” woofer. Klippel NFS tests show reasonably smooth listening window directivity in the lower registers and bass reaching 74.7Hz (-6dB). High 90dB sensitivity makes it easy to power with inexpensive multi-zone amplifiers. Measured bass extension of 95.2Hz (-3dB).
Cons: Preference score is 2.12 (5.30 with sub) due to notable mid-frequency irregularities and uneven directivity through the crossover handover. High-frequency treble rolls off early compared to indoor hi-fi designs.
Full OSD Audio AP650 review and specifications →
| Bass Extension (-10dB) | 48.3Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 95.2Hz (measured, Audio Science Review) |
| Bass Extension (-6dB) | 74.7Hz (measured, Audio Science Review) |
| Configuration | Passive 2-way |
| Dimensions | 12”H x 8”W x 8”D (305 x 203 x 203 mm) |
| Drivers | 6.5” polypropylene cone woofer, 1” silk dome tweeter |
| Enclosure | Sealed composite IPX6 all-weather |
| Impedance | 8 ohms |
| Power Handling | 150W |
| Sensitivity | 90dB |
| Spinorama Preference Score | 2.12 |
| Spinorama Preference Score with Perfect Sub | 5.30 |
| Weight | 8.6 lbs (3.9 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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