Short answer: the Optimal Audio Cuboid 10 if sound quality matters most, the Optimal Audio Cuboid 3 if price matters most. The Optimal Audio Cuboid 10 ranks #3 of 32 surface-mount and background music speakers, rated 3.4/5, at $660. The Optimal Audio Cuboid 3 ranks #30, rated 2.3/5, at $85, $575 cheaper.
The Optimal Audio Cuboid 10 is the more accurate, deeper-bass pick. A larger member of Optimal Audio’s Cuboid installation range, with a 10-inch woofer that reaches 47.5Hz at -3dB in vendor measurements, deep for an installation box, and a cabinet matching the smaller Optimal Audio Cuboid 5. Its measured preference score, a predictor of how neutral it sounds, is 3.01 against -0.18 for the Optimal Audio Cuboid 3. Its bass reaches about 47.5Hz before falling 3dB, against 115Hz for the Optimal Audio Cuboid 3. Watch for: Directivity is uneven (3.93dB variation) and the on-axis response is uneven (0.61 band deviation), so it scores 3.01 on its own and 5.08 with an ideal subwoofer.
Why pick the Optimal Audio Cuboid 3: A tiny installation speaker from Optimal Audio with a 3” driver. The catch: Bass is very limited, so it needs a subwoofer, and the on-axis response is very uneven (2.07 average deviation).
Buy the Optimal Audio Cuboid 10 when sound quality outweighs the price for you, and the Optimal Audio Cuboid 3 when the price outweighs sound quality instead.
Want more options? Browse the full PA & Live Sound rankings.
Specifications Side By Side
| Optimal Audio Cuboid 10 | Optimal Audio Cuboid 3 | |
|---|---|---|
| Price | $660 each Passive | $85 each Passive |
| Ranked | #3 of 32 in Surface-Mount and Background Music Speakers | #30 of 32 in Surface-Mount and Background Music Speakers |
| Passive | Yes | Yes |
| Bluetooth | No | No |
| Drivers | 10” woofer, 2-way | 3” driver |
| Bass Extension (-3dB) | 47.5Hz (measured, manufacturer data via spinorama.org) | 115.0Hz (measured, manufacturer data via spinorama.org) |
| Bass Extension (-10dB) | about 37.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) | about 82.4Hz (measured, manufacturer data via spinorama.org) |
| Spinorama Preference Score | 3.01 (spinorama.org) | -0.18 |
| Spinorama Preference Score with Perfect Sub | 5.08 (spinorama.org) | 3.43 |
| DIY Kit | No | No |
| Maximum SPL | - | 104dB peak (manufacturer specified) |
| Weight | - | 2.8 lbs (1.26 kg) |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared.
Measurement data: Optimal Audio Cuboid 10 (measured by the manufacturer) and Optimal Audio Cuboid 3 (measured by the manufacturer), via spinorama.org.
Related Speaker Comparisons
More top alternatives to Optimal Audio Cuboid 10:
- Optimal Audio Cuboid 10 vs Optimal Audio Cuboid 8
- Optimal Audio Cuboid 10 vs Optimal Audio Cuboid 12
- Optimal Audio Cuboid 10 vs Optimal Audio Cuboid 15
- Optimal Audio Cuboid 10 vs Optimal Audio Cuboid 5
- Optimal Audio Cuboid 12 vs Optimal Audio Cuboid 3
Prices on this page were last checked October 14, 2026 at 2:38 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Optimal Audio Cuboid 10: $660 each Passive eBay
Pros: A larger member of Optimal Audio’s Cuboid installation range, with a 10-inch woofer that reaches 47.5Hz at -3dB in vendor measurements, deep for an installation box, and a cabinet matching the smaller Optimal Audio Cuboid 5. Measured bass extension of 37.6Hz (-10dB).
Cons: Directivity is uneven (3.93dB variation) and the on-axis response is uneven (0.61 band deviation), so it scores 3.01 on its own and 5.08 with an ideal subwoofer. It is sold through Allen & Heath and Optimal Audio installers with no US retail listing.
Full Optimal Audio Cuboid 10 review and specifications →
| Bass Extension (-10dB) | about 37.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 47.5Hz (measured, manufacturer data via spinorama.org) |
| Bluetooth | No |
| DIY Kit | No |
| Drivers | 10” woofer, 2-way |
| Passive | Yes |
| Spinorama Preference Score | 3.01 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 5.08 (spinorama.org) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Optimal Audio Cuboid 3: $85 each Passive eBay
Same family: the Optimal Audio Cuboid 5 (larger model, ranked higher, rated 2.5/5).
Pros: A tiny installation speaker from Optimal Audio with a 3” driver. Optimal Audio’s measurements show a preference score of -0.18 that reaches 3.43 with an ideal subwoofer, with 0.82 listening window deviation.
Cons: Bass is very limited, so it needs a subwoofer, and the on-axis response is very uneven (2.07 average deviation). That data is low quality and comes from Optimal Audio. Bass reaches 115.0Hz (-3dB) and about 82Hz (-10dB). That data is low quality.
Full Optimal Audio Cuboid 3 review and specifications →
| Released | Nov 2022 (3 years ago) |
|---|---|
| Bass Extension (-10dB) | about 82.4Hz (measured, manufacturer data via spinorama.org) |
| Bass Extension (-3dB) | 115.0Hz (measured, manufacturer data via spinorama.org) |
| Bluetooth | No |
| DIY Kit | No |
| Drivers | 3” driver |
| Maximum SPL | 104dB peak (manufacturer specified) |
| Passive | Yes |
| Spinorama Preference Score | -0.18 |
| Spinorama Preference Score with Perfect Sub | 3.43 |
| Weight | 2.8 lbs (1.26 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons