Short answer: the MartinLogan Depth 215. It ranks #40 of 143 subwoofers by sound quality, rated 4.3/5, at $6,999.99. The PSB SubSeries BP12 ranks #74, rated 4.2/5, at $6,699, $300.99 cheaper, not enough of a saving to outweigh the sound-quality gap.
Why pick the MartinLogan Depth 215: The flagship of MartinLogan’s Depth series: two opposed 15” Carbon Aerocore woofers in a force-cancelling sealed cabinet with a 4400W peak amplifier, rated 18 to 120Hz (±3dB), with app control and Anthem Room Correction. Watch for: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from MartinLogan’s measured subs, the best of which, the single-15” MartinLogan Dynamo 1600X, reached 120.5dB in the 40 to 80Hz CEA-2010 bands.
What the PSB SubSeries BP12 does well: PSB’s flagship subwoofer: two opposed 12” drivers in a sealed cabinet with a 1000W Purifi amplifier (2 x 500W), rated 20 to 150Hz (±3dB) and 17Hz at -10dB. The tradeoff: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from the measured PSB Speakers SubSeries 450 (122.1dB in the 40 to 80Hz CEA-2010 bands); two opposed 12” drivers in a sealed box with 1000W should come close to it.
Buy the MartinLogan Depth 215. It is rated higher for sound quality, and the $300.99 saving on the PSB SubSeries BP12 is not enough to make up the difference.
About the ratings: neither speaker has been measured yet, so both ratings are estimated from measured siblings and predecessors (likely ranges: MartinLogan Depth 215 3.9 to 4.5; PSB SubSeries BP12 3.8 to 4.4). Treat this verdict as provisional.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| MartinLogan Depth 215 | PSB SubSeries BP12 | |
|---|---|---|
| Price | $6,999.99 | $6,699.00 |
| Ranked | #40 of 143 in Large Home Subwoofers (Over 75 lbs) Estimated | #74 of 143 in Large Home Subwoofers (Over 75 lbs) Estimated |
| Country | United States | Canada |
| Warranty | 3 | 5/1 |
| Enclosure | sealed | sealed |
| Drivers | 2 x 15” Carbon Aerocore woofers (opposed) | 2 x 12” drivers (opposed) |
| Amplifier Power | 4400W peak | 1000W (2 x 500W) Purifi |
| Frequency Response | 18-120Hz ±3dB (manufacturer specified) | 20-150Hz ±3dB (manufacturer specified) |
| Dimensions | 22.5”H x 22.8”W x 23.4”D (572 x 580 x 595 mm) | 19.3”H x 18.9”W x 18.9”D (490 x 480 x 480 mm) |
| Weight | 173.1 lbs (78.5 kg) | 132.1 lbs (59.9 kg) |
| XLR Input | Yes | - |
| AES Input | No | - |
Related Speaker Comparisons
More worthwhile head-to-heads for MartinLogan Depth 215:
- JL Audio Fathom f212v2 vs MartinLogan Depth 215
- MartinLogan Depth 215 vs MartinLogan Depth 212
- PSB SubSeries BP12 vs Bowers & Wilkins DB1D
- Paradigm Persona SUB vs PSB SubSeries BP12
- Perlisten Audio D212s vs PSB SubSeries BP12
Prices on this page were last checked October 11, 2026 at 4:59 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
MartinLogan Depth 215: $6,999.99 Estimated MartinLogan eBay
Same family: the MartinLogan Depth 212 (smaller subwoofer, ranked lower, estimated 4.1/5).
Pros: The flagship of MartinLogan’s Depth series: two opposed 15” Carbon Aerocore woofers in a force-cancelling sealed cabinet with a 4400W peak amplifier, rated 18 to 120Hz (±3dB), with app control and Anthem Room Correction.
Cons: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from MartinLogan’s measured subs, the best of which, the single-15” MartinLogan Dynamo 1600X, reached 120.5dB in the 40 to 80Hz CEA-2010 bands. Two opposed 15” drivers and 4400W peak should go beyond that. It weighs 78.5kg.
Full MartinLogan Depth 215 review and specifications →
| Released | Nov 2025 (11 months ago) |
|---|---|
| AES Input | No |
| Amplifier Power | 4400W peak |
| Country | United States |
| Dimensions | 22.5”H x 22.8”W x 23.4”D (572 x 580 x 595 mm) |
| Drivers | 2 x 15” Carbon Aerocore woofers (opposed) |
| Enclosure | sealed |
| Frequency Response | 18-120Hz ±3dB (manufacturer specified) |
| Warranty | 3 |
| Weight | 173.1 lbs (78.5 kg) |
| XLR Input | Yes |
- Links
- 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
PSB SubSeries BP12: $6,699.00 Estimated PSB eBay
Same family: the PSB SubSeries BP7 (smaller subwoofer, estimated 3.3/5) and the PSB SubSeries BP8 (smaller subwoofer, estimated 3.6/5).
Pros: PSB’s flagship subwoofer: two opposed 12” drivers in a sealed cabinet with a 1000W Purifi amplifier (2 x 500W), rated 20 to 150Hz (±3dB) and 17Hz at -10dB.
Cons: No independent measurements yet, so its output can’t be compared directly with ranked subwoofers; the rating is estimated from the measured PSB Speakers SubSeries 450 (122.1dB in the 40 to 80Hz CEA-2010 bands); two opposed 12” drivers in a sealed box with 1000W should come close to it. It weighs 60kg.
Full PSB SubSeries BP12 review and specifications →
| Amplifier Power | 1000W (2 x 500W) Purifi |
|---|---|
| Country | Canada |
| Dimensions | 19.3”H x 18.9”W x 18.9”D (490 x 480 x 480 mm) |
| Drivers | 2 x 12” drivers (opposed) |
| Enclosure | sealed |
| Frequency Response | 20-150Hz ±3dB (manufacturer specified) |
| Warranty | 5/1 |
| Weight | 132.1 lbs (59.9 kg) |
- Links
- 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