SVS
SB-1000 Pro
Subwoofer
From
$599.99
Klipsch R-121SW
Klipsch's current 12-inch Reference subwoofer, which replaced the R-120SW and uses an all-digital amplifier.
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The verdict
A plain, receiver-friendly subwoofer from a major home theater brand, and the one to consider instead of the older R-120SW. Its numeric specs were not readable from the maker's page and no independent review was read, so verify output and size before buying.
The R-121SW is a front-firing 12-inch subwoofer in Klipsch's newest Reference line. Klipsch's own R-120SW page now points shoppers to this model as the latest. It uses a spun-copper thermoformed crystalline polymer woofer, a built-in all-digital amplifier, a reinforced three-quarter-inch MDF cabinet with new bracing, and low pass crossover and phase controls. It takes line-level or LFE RCA inputs. Klipsch's page prints no wattage, dimensions or weight, so those are left unknown.
Strengths
- Front-firing 12-inch driver with an all-digital amplifier.
- Gain, low pass crossover and phase controls to blend with other speakers.
- Reinforced MDF cabinet with new bracing, per Klipsch.
Weak spots
- No wattage, size or weight could be confirmed from the maker's page.
- No independent review of this model was read for this entry.
- No app or wireless control is described.
Great for
- Buyers adding a simple 12-inch subwoofer to a Klipsch Reference system
Skip if
- Buyers who want app tuning or wireless connection
Full specifications
From the manufacturer unless noted. Shown for this model.
Sound
- Driver size
- 12 in
Primary source: klipsch.com
Setup notes
- Line level and LFE RCA inputs work with standard home theater receivers.
Questions
Does the R-121SW replace the R-120SW?
Klipsch's R-120SW page invites shoppers to buy the new Reference R-121SW instead, so the R-121SW is the current 12-inch Reference subwoofer.
How do I connect it to a receiver?
It has line level and LFE RCA inputs, which Klipsch says are compatible with home theater receivers.
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Sources for this page
Last reviewed Nov 9, 2026. Spotted an error? Tell us.