Short answer: the Klipsch R-121SW. It ranks #77 of 137 subwoofers at $279; the Monoprice Monolith M-10 V2 ranks #88 and costs $792.77, so there is not much of a tradeoff to weigh.
The case for the Klipsch R-121SW: 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion.
What the Monoprice Monolith M-10 V2 gets right: 10-inch THX-certified ported with 500W RMS reaches 17-20Hz.
Buy the Klipsch R-121SW if the ranking matters more than the price. Buy the Monoprice Monolith M-10 V2 if the price matters more than the ranking.
Specifications Side By Side
| Klipsch R-121SW | Monoprice Monolith M-10 V2 | |
|---|---|---|
| Price | $279.00 | $792.77 |
| Ranked | #77 of 137 in Medium Powered Home Subwoofers (30-75 lbs) | #88 of 137 in Medium Powered Home Subwoofers (30-75 lbs) |
| Enclosure | ported, rear | ported, front |
| Output SPL at 15 Hz | 90.7 dB | 93.9 dB |
| Output SPL at 20 Hz | 96.0 dB | 104.8 dB |
| Output SPL at 25 Hz | 98.4 dB | 108.5 dB |
| Output SPL at 31.5 Hz | 102.3 dB | 109.3 dB |
| Output SPL at 40 Hz | 108.2 dB | 109.7 dB |
| Output SPL at 50 Hz | 112.4 dB | 110.1 dB |
| Output SPL at 63 Hz | 112.9 dB | 110.6 dB |
| Output SPL at 80 Hz | 111.3 dB | 110.9 dB |
| Output SPL at 100 Hz | 109.9 dB | 111.2 dB |
| Output SPL at 125 Hz | 108.3 dB | 111.5 dB |
| CEA-2010-A Average (40-80Hz) | 111.2 dB | 110.3 dB |
| Dimensions | 16.6"H x 16.0"W x 19.7"D (421.6 x 406.4 x 500.4 mm) | 20.9"H x 15.0"W x 18.9"D (530.9 x 381.0 x 480.1 mm) |
| Weight | 35.1 lbs / 15.9 kg | 72.5 lbs / 32.9 kg |
| Warranty | 5/2 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Manufacturer |
| Power Output (Watts) | 200W RMS | 500W RMS |
| Frequency Response | 28-120Hz | 17-20Hz |
| Drivers | 12" (305mm) driver | 10" (254mm) driver |
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 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
- Klipsch R-121SW vs SVS SB-3000
- See all 14 comparisons
- Links
Monoprice Monolith M-10 V2: $792.77 Amazon
Pros: 10-inch THX-certified ported with 500W RMS reaches 17-20Hz. HDF cabinet eliminates resonance-induced coloration. Extended EQ and THX EQ modes for flexibility. Low distortion output. Best for rooms under 2500 cubic feet. Exceptional budget value at $649.
Notes: Product # 42843
| CEA-2010-A Average (40-80Hz) | 110.3 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 20.9"H x 15.0"W x 18.9"D (530.9 x 381.0 x 480.1 mm) |
| Drivers | 10" (254mm) driver |
| Enclosure | ported, front |
| Frequency Response | 17-20Hz |
| Measurement Source | Manufacturer |
| Output SPL at 15 Hz | 93.9 dB |
| Output SPL at 20 Hz | 104.8 dB |
| Output SPL at 25 Hz | 108.5 dB |
| Output SPL at 31.5 Hz | 109.3 dB |
| Output SPL at 40 Hz | 109.7 dB |
| Output SPL at 50 Hz | 110.1 dB |
| Output SPL at 63 Hz | 110.6 dB |
| Output SPL at 80 Hz | 110.9 dB |
| Output SPL at 100 Hz | 111.2 dB |
| Output SPL at 125 Hz | 111.5 dB |
| Power Output (Watts) | 500W RMS |
| Warranty | 5 |
| Weight | 72.5 lbs / 32.9 kg |
- Head-to-Head Comparisons
- Monoprice Monolith M-10 V2 vs Monoprice SSW-10
- Monoprice Monolith M-10 V2 vs SVS SB-2000
- Monoprice Monolith M-10 V2 vs RSL (Rogersound Labs) Speedwoofer 10S MKII
- Monoprice Monolith M-10 V2 vs Rythmik F12
- Monoprice Monolith M-10 V2 vs Kef KC62
- Monoprice Monolith M-10 V2 vs Monoprice SW-12
- Monoprice Monolith M-10 V2 vs SVS PB-1000 PRO
- Monoprice Monolith M-10 V2 vs SVS SB-3000
- See all 13 comparisons
- Links
As an Amazon Associate I earn from qualifying purchases.
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.