Short answer: the Power Sound Audio S2112. It ranks #38 of 143 subwoofers by sound quality, rated 4.3/5, at $2,299; the MartinLogan Grotto 15 ranks #76, rated 4.2/5, and costs $2,379.99, so there is not much of a tradeoff to weigh.
What the Power Sound Audio S2112 does well: Combines a huge 21-inch Italian neodymium woofer with a 1,920W ICEpower amplifier inside an airtight sealed enclosure. The catch: The 660H x 610W x 508D mm cabinet is wide and heavy at 130.1 lbs (59 kg).
Why pick the MartinLogan Grotto 15: MartinLogan’s largest single-driver passive radiator subwoofer: a 15” active aluminum woofer with two 15” passive radiators and a 2000W peak (1000W continuous) Magnitude amplifier, rated 20 to 120Hz (±3dB). 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 single-15” MartinLogan Dynamo 1600X reached 120.5dB in the 40 to 80Hz CEA-2010 bands, and the Grotto 15 adds two 15” passive radiators and 1000W continuous.
Buy the Power Sound Audio S2112. It is rated higher for sound quality than the MartinLogan Grotto 15 and costs less, so only choose the other one for a particular feature it does better.
About the ratings: the MartinLogan Grotto 15’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 3.8 to 4.4, so this verdict could change once it is measured.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Power Sound Audio S2112 | MartinLogan Grotto 15 | |
|---|---|---|
| Price | $2,299.00 each | $2,379.99 |
| Ranked | #38 of 143 in Large Home Subwoofers (Over 75 lbs) | #76 of 143 in Large Home Subwoofers (Over 75 lbs) Estimated |
| Amplifier Power | 1920W RMS | 1000W continuous (2000W peak) |
| CEA-2010-A Average (40-80Hz) | 124.6 dB | - |
| Cabinet Color | black | - |
| Country | United States | United States |
| Dimensions | 26”H x 24”W x 20”D (660.4 x 609.6 x 508.0 mm) | 20.6”H x 21.8”W x 21.8”D (522 x 554 x 554 mm) |
| Drivers | 21” (533mm) driver | 15” aluminum woofer, 2 x 15” passive radiators |
| Enclosure | sealed | passive radiator |
| Measurement Source | Data-bass | - |
| Output SPL at 12.5 Hz | 98.5 dB | - |
| Output SPL at 15 Hz | 104.2 dB | - |
| Output SPL at 20 Hz | 110.8 dB | - |
| Output SPL at 25 Hz | 116.5 dB | - |
| Output SPL at 31.5 Hz | 121.4 dB | - |
| Output SPL at 40 Hz | 124.8 dB | - |
| Output SPL at 50 Hz | 125.0 dB | - |
| Output SPL at 63 Hz | 124.5 dB | - |
| Output SPL at 80 Hz | 124.0 dB | - |
| Output SPL at 100 Hz | 123.5 dB | - |
| Output SPL at 125 Hz | 123.0 dB | - |
| RCA Input | Yes | - |
| Warranty | 5 | 3 |
| Weight | 130.1 lbs (59.0 kg) | 117.9 lbs (53.5 kg) |
| Frequency Response | - | 20-120Hz ±3dB (manufacturer specified) |
| XLR Input | - | Yes |
| AES Input | - | No |
Related Speaker Comparisons
More top alternatives to Power Sound Audio S2112:
- Power Sound Audio TV2112 vs Power Sound Audio S2112
- Power Sound Audio S2112 vs Rythmik FV15HP
- MartinLogan Grotto 15 vs MartinLogan Grotto 12
- SVS PB-5000 R-Evolution vs SVS PB-4000
- SVS PB-5000 R-Evolution vs REL Acoustics HT/1510 Predator II
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.
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The Two Speakers In Full
Power Sound Audio S2112: $2,299.00 each Power Sound Audio eBay
Pros: Combines a huge 21-inch Italian neodymium woofer with a 1,920W ICEpower amplifier inside an airtight sealed enclosure. Offers reference transient speed, group delay under one cycle, and massive displacement capable of 110.8 dB at 20 Hz and 124.6 dB mid-bass output with zero port noise.
Cons: The 660H x 610W x 508D mm cabinet is wide and heavy at 59 kg. Sealed design requires room gain for maximum extension below 15Hz.
Full Power Sound Audio S2112 review and specifications →
| Released | Mar 2022 (4 years ago) |
|---|---|
| Amplifier Power | 1920W RMS |
| CEA-2010-A Average (40-80Hz) | 124.6 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 26”H x 24”W x 20”D (660.4 x 609.6 x 508.0 mm) |
| Drivers | 21” (533mm) driver |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 12.5 Hz | 98.5 dB |
| Output SPL at 15 Hz | 104.2 dB |
| Output SPL at 20 Hz | 110.8 dB |
| Output SPL at 25 Hz | 116.5 dB |
| Output SPL at 31.5 Hz | 121.4 dB |
| Output SPL at 40 Hz | 124.8 dB |
| Output SPL at 50 Hz | 125.0 dB |
| Output SPL at 63 Hz | 124.5 dB |
| Output SPL at 80 Hz | 124.0 dB |
| Output SPL at 100 Hz | 123.5 dB |
| Output SPL at 125 Hz | 123.0 dB |
| RCA Input | Yes |
| Warranty | 5 |
| Weight | 130.1 lbs (59.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
MartinLogan Grotto 15: $2,379.99 Estimated Audio Advice eBay
Same family: the MartinLogan Grotto 12 (smaller subwoofer, ranked lower, estimated 4/5).
Pros: MartinLogan’s largest single-driver passive radiator subwoofer: a 15” active aluminum woofer with two 15” passive radiators and a 2000W peak (1000W continuous) Magnitude amplifier, rated 20 to 120Hz (±3dB).
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 single-15” MartinLogan Dynamo 1600X reached 120.5dB in the 40 to 80Hz CEA-2010 bands, and the Grotto 15 adds two 15” passive radiators and 1000W continuous. It weighs 53.5kg.
Full MartinLogan Grotto 15 review and specifications →
| Released | Nov 2025 (11 months ago) |
|---|---|
| AES Input | No |
| Amplifier Power | 1000W continuous (2000W peak) |
| Country | United States |
| Dimensions | 20.6”H x 21.8”W x 21.8”D (522 x 554 x 554 mm) |
| Drivers | 15” aluminum woofer, 2 x 15” passive radiators |
| Enclosure | passive radiator |
| Frequency Response | 20-120Hz ±3dB (manufacturer specified) |
| Warranty | 3 |
| Weight | 117.9 lbs (53.5 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