Short answer: the MartinLogan Dynamo 1600X for the higher ranking, the Klipsch R-121SW for the lower price. The MartinLogan Dynamo 1600X ranks #2 of 137 subwoofers at $1606.77. The Klipsch R-121SW ranks #77 at $279, $1327.77 cheaper.
The case for the Klipsch R-121SW: 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion.
What the MartinLogan Dynamo 1600X gets right: Sealed 15-inch with 900W RMS, 1800W peak delivers forceful clean tight low bass. The tradeoff: Ported design room integration needs, mid-range 121.5 dB output, and $1,607 price.
Buy the Klipsch R-121SW if the price matters more than the ranking. Buy the MartinLogan Dynamo 1600X if the ranking matters more than the price.
Specifications Side By Side
| Klipsch R-121SW | MartinLogan Dynamo 1600X | |
|---|---|---|
| Price | $279.00 | $1,606.77 |
| Ranked | #77 of 137 in Medium Powered Home Subwoofers (30-75 lbs) | #2 of 137 in Medium Powered Home Subwoofers (30-75 lbs) |
| Enclosure | ported, rear | sealed |
| Output SPL at 15 Hz | 90.7 dB | 86.2 dB |
| Output SPL at 20 Hz | 96.0 dB | 99.4 dB |
| Output SPL at 25 Hz | 98.4 dB | 103.9 dB |
| Output SPL at 31.5 Hz | 102.3 dB | 111.7 dB |
| Output SPL at 40 Hz | 108.2 dB | 118.4 dB |
| Output SPL at 50 Hz | 112.4 dB | 121.0 dB |
| Output SPL at 63 Hz | 112.9 dB | 121.8 dB |
| Output SPL at 80 Hz | 111.3 dB | 121.0 dB |
| Output SPL at 100 Hz | 109.9 dB | 120.2 dB |
| Output SPL at 125 Hz | 108.3 dB | 119.0 dB |
| CEA-2010-A Average (40-80Hz) | 111.2 dB | 120.5 dB |
| Dimensions | 16.6"H x 16.0"W x 19.7"D (421.6 x 406.4 x 500.4 mm) | 20.1"H x 17.9"W x 19.1"D (510.5 x 454.7 x 485.1 mm) |
| Weight | 35.1 lbs / 15.9 kg | 56 lbs / 25.4 kg |
| Warranty | 5/2 | 3 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Power Output (Watts) | 200W RMS | 900W RMS / 1800W peak |
| Frequency Response | 28-120Hz | 20-200Hz, ±3dB |
| Drivers | 12" (305mm) driver | 15" (381mm) driver |
| Input Connections | - | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) |
The Two Speakers In Full
Klipsch R-121SW: $279.00 Amazon
Pros: 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion. Front-firing design maximizes placement flexibility. Excellent value with exceptional bang-for-buck.
| CEA-2010-A Average (40-80Hz) | 111.2 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 16.6"H x 16.0"W x 19.7"D (421.6 x 406.4 x 500.4 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, rear |
| Frequency Response | 28-120Hz |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 90.7 dB |
| Output SPL at 20 Hz | 96.0 dB |
| Output SPL at 25 Hz | 98.4 dB |
| Output SPL at 31.5 Hz | 102.3 dB |
| Output SPL at 40 Hz | 108.2 dB |
| Output SPL at 50 Hz | 112.4 dB |
| Output SPL at 63 Hz | 112.9 dB |
| Output SPL at 80 Hz | 111.3 dB |
| Output SPL at 100 Hz | 109.9 dB |
| Output SPL at 125 Hz | 108.3 dB |
| Power Output (Watts) | 200W RMS |
| Warranty | 5/2 |
| Weight | 35.1 lbs / 15.9 kg |
- Head-to-Head Comparisons
- Klipsch R-121SW vs SVS SB-2000
- Klipsch R-121SW vs Monoprice Monolith M-10 V2
- Klipsch R-121SW vs RSL (Rogersound Labs) Speedwoofer 10S MKII
- Klipsch R-121SW vs Rythmik F12
- Klipsch R-121SW vs Monoprice SSW-10
- Klipsch R-121SW vs Monoprice SW-12
- Klipsch R-121SW vs SVS PB-1000 PRO
- Klipsch R-121SW vs Kef KC62
- See all 14 comparisons
- Links
MartinLogan Dynamo 1600X: $1,606.77
Pros: Sealed 15-inch with 900W RMS, 1800W peak delivers forceful clean tight low bass. Easily configurable as forward-firing or down-firing. Smartphone app with Anthem Room Correction (ARC) optimizes bass across room. Wireless capable with optional SWT-X module.
Cons: Ported design room integration needs, mid-range 121.5 dB output, and $1,607 price.
| CEA-2010-A Average (40-80Hz) | 120.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 20.1"H x 17.9"W x 19.1"D (510.5 x 454.7 x 485.1 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | sealed |
| Frequency Response | 20-200Hz, ±3dB |
| Input Connections | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 86.2 dB |
| Output SPL at 20 Hz | 99.4 dB |
| Output SPL at 25 Hz | 103.9 dB |
| Output SPL at 31.5 Hz | 111.7 dB |
| Output SPL at 40 Hz | 118.4 dB |
| Output SPL at 50 Hz | 121.0 dB |
| Output SPL at 63 Hz | 121.8 dB |
| Output SPL at 80 Hz | 121.0 dB |
| Output SPL at 100 Hz | 120.2 dB |
| Output SPL at 125 Hz | 119.0 dB |
| Power Output (Watts) | 900W RMS / 1800W peak |
| Warranty | 3 |
| Weight | 56 lbs / 25.4 kg |
- Head-to-Head Comparisons
- MartinLogan Dynamo 1600X vs HSU Research ULS-15 MK2
- MartinLogan Dynamo 1600X vs JTR Speakers Captivator 212PRO
- MartinLogan Dynamo 1600X vs Power Sound Audio (PSA) XV15
- MartinLogan Dynamo 1600X vs Monoprice SW-15
- MartinLogan Dynamo 1600X vs SVS SB-3000
- MartinLogan Dynamo 1600X vs SVS PB-1000 PRO
- MartinLogan Dynamo 1600X vs Monoprice SW-12
- MartinLogan Dynamo 1600X vs Rythmik F12
- See all 15 comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.