Klipsch R-121SW vs RSL (Rogersound Labs) Speedwoofer 10S MKII

Last updated: August 9, 2026

Short answer: the RSL (Rogersound Labs) Speedwoofer 10S MKII for the higher ranking, the Klipsch R-121SW for the lower price. The RSL (Rogersound Labs) Speedwoofer 10S MKII ranks #66 of 137 subwoofers at $450. The Klipsch R-121SW ranks #77 at $279, $171 cheaper.

What the Klipsch R-121SW gets right: 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion.

On the RSL (Rogersound Labs) Speedwoofer 10S MKII side: 10-inch ported with 400W RMS (1020W peak) XDR amplifier.

Buy the Klipsch R-121SW if the price matters more than the ranking. Buy the RSL (Rogersound Labs) Speedwoofer 10S MKII if the ranking matters more than the price.

Specifications Side By Side

Klipsch R-121SW RSL (Rogersound Labs) Speedwoofer 10S MKII
Price$279.00$450
Ranked#77 of 137 in Medium Powered Home Subwoofers (30-75 lbs)#66 of 137 in Medium Powered Home Subwoofers (30-75 lbs)
Enclosureported, rearported, rear
Output SPL at 15 Hz90.7 dB89.0 dB
Output SPL at 20 Hz96.0 dB100.0 dB
Output SPL at 25 Hz98.4 dB105.0 dB
Output SPL at 31.5 Hz102.3 dB107.7 dB
Output SPL at 40 Hz108.2 dB110.3 dB
Output SPL at 50 Hz112.4 dB112.9 dB
Output SPL at 63 Hz112.9 dB113.0 dB
Output SPL at 80 Hz111.3 dB112.1 dB
Output SPL at 100 Hz109.9 dB111.4 dB
Output SPL at 125 Hz108.3 dB110.7 dB
CEA-2010-A Average (40-80Hz)111.2 dB112.1 dB
Dimensions16.6"H x 16.0"W x 19.7"D (421.6 x 406.4 x 500.4 mm)15.5"H x 15.0"W x 15.75"D (393.7 x 381.0 x 400.0 mm)
Weight35.1 lbs / 15.9 kg40.6 lbs / 18.4 kg
Warranty5/2?
Cabinet Colorblackblack, white
CountryUnited StatesUnited States
Measurement SourceAudioholicsAudioholics
Power Output (Watts)200W RMS400W RMS
Frequency Response28-120Hz21-200Hz
Drivers12" (305mm) driver10" (254mm) driver

The Two Speakers In Full

Klipsch R-121SW: $279.00 Amazon

Klipsch R-121SW ranking card

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 Colorblack
CountryUnited States
Dimensions16.6"H x 16.0"W x 19.7"D (421.6 x 406.4 x 500.4 mm)
Drivers12" (305mm) driver
Enclosureported, rear
Frequency Response28-120Hz
Measurement SourceAudioholics
Output SPL at 15 Hz90.7 dB
Output SPL at 20 Hz96.0 dB
Output SPL at 25 Hz98.4 dB
Output SPL at 31.5 Hz102.3 dB
Output SPL at 40 Hz108.2 dB
Output SPL at 50 Hz112.4 dB
Output SPL at 63 Hz112.9 dB
Output SPL at 80 Hz111.3 dB
Output SPL at 100 Hz109.9 dB
Output SPL at 125 Hz108.3 dB
Power Output (Watts)200W RMS
Warranty5/2
Weight35.1 lbs / 15.9 kg
Check current price at Amazon ($279.00) →

RSL (Rogersound Labs) Speedwoofer 10S MKII: $450

RSL (Rogersound Labs) Speedwoofer 10S MKII ranking card

Pros: 10-inch ported with 400W RMS (1020W peak) XDR amplifier. DSP with dual modes (LFE mode for 22Hz extension, Music mode for tight response). Quick tight musical bass at excellent $449 price. Wireless receiver built-in.

CEA-2010-A Average (40-80Hz)112.1 dB
Cabinet Colorblack, white
CountryUnited States
Dimensions15.5"H x 15.0"W x 15.75"D (393.7 x 381.0 x 400.0 mm)
Drivers10" (254mm) driver
Enclosureported, rear
Frequency Response21-200Hz
Measurement SourceAudioholics
Output SPL at 15 Hz89.0 dB
Output SPL at 20 Hz100.0 dB
Output SPL at 25 Hz105.0 dB
Output SPL at 31.5 Hz107.7 dB
Output SPL at 40 Hz110.3 dB
Output SPL at 50 Hz112.9 dB
Output SPL at 63 Hz113.0 dB
Output SPL at 80 Hz112.1 dB
Output SPL at 100 Hz111.4 dB
Output SPL at 125 Hz110.7 dB
Power Output (Watts)400W RMS
Warranty?
Weight40.6 lbs / 18.4 kg

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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.