Klipsch R-121SW Front-Firing Subwoofer
- Driver Size: 12 inches
- Power: 400 watts
- Connectivity: Speaker Wire
- Brand Tech: Klipsch
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A straightforward floor-standing 12 inch subwoofer for buyers who already have main speakers and want more low end.
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ASIN: B09P8WJTB3Model: R-121SWCategory: Subwoofers
Overview
The Klipsch R-121SW is a floor-standing subwoofer with a 12 inch driver and 400 watts of power, connected to a system by speaker wire.
At 34.2 pounds and roughly 20 by 16 by 17 inches, this is a full-size floor subwoofer meant to sit on the ground rather than a shelf, adding low-end output to a stereo or home theater speaker set.
- 12 inch driver
- 400 watts of power
- Floor-standing design
- Black finish, 34.2 lb
Who it's for
Home theater or stereo owners adding dedicated bass to existing speakers, with floor space for a standalone cabinet. Not suited to anyone needing a compact or shelf sub.
Pros and cons
- 12 inch driver for low-end output
- 400 watt power rating
- Speaker wire only, no wireless connection listed
- 34.2 lb, needs dedicated floor space
Performance notes
The 12 inch driver and 400 watt power rating are sized for room-filling low frequencies, while the speaker wire connection ties it into an existing amplifier or receiver rather than working wirelessly.
Specifications
| Brand | Klipsch |
|---|---|
| Model | R-121SW |
| Dimensions & fit | |
| Driver Size | 12 incheshigher than 51% of 38 subwoofers |
| Weight | 34.2 poundshigher than 71% of 56 subwoofers |
| Dimensions | 19.7 × 16 × 16.6 inches |
| Dimensions | 19.7 x 16 x 16.6 in |
| Power & efficiency | |
| Power | 400 wattshigher than 51% of 40 subwoofers |
| Construction & materials | |
| Color | Black |
| Compatibility & installation | |
| Connectivity | Speaker Wire |
| Mounting | Floor Standing |
| Other details | |
| Brand Tech | Klipsch |
| Speaker Type | Subwoofer |
Closest rivals on specs
BIC America H-100II Powered Subwoofer 12 Inch- Power 400 vs 300 watts (+33%)
JBL Studio 660P Powered Subwoofer 12 Inch- Power 400 vs 500 watts (-20%)
- Weight 34.2 vs 25 pounds (+37%)
JBL Stage 2 220P Powered Subwoofer 12 Inch- Power 400 vs 500 watts (-20%)
- Weight 34.2 vs 18.7 pounds (+83%)
Frequently asked questions
How is the Klipsch R-121SW connected?
Via speaker wire, so it needs an amplifier or receiver with a subwoofer output nearby.
What size is the driver?
12 inches.
Does it sit on a shelf or the floor?
It is a floor-standing design at 34.2 pounds, meant to sit on the ground.