What are the differences between this and the 120sw?

The R-121SW has an updated woofer driver and a larger batter braced cabinet. It is able to produce a bit more bass and sound tighter.

When in auto position the led green light remains on even when the amp is off. is this normal?

The subwoofer should shut off after about 15 minutes of no signal from the amp so it will not happen right as you shut the amp off. If the sub is still not going on standby, there may be some noise coming from the amp or wiring between the amp and subwoofer that is keeping the sub from going to sleep. Reach out to our support team through our website if you need further support.

Can you use a wireless kit with this sub

You can use a 3rd party wireless kit that will connect using rca connections on the back of the sub. We do not make a wireless kit that will work with this subwoofer here. Thank you.

The product description and information say that this sub is wireless. How does it receive the signal from the receiver? Is there a transmitter, also?

This subwoofer has no wireless function, looks like this is just a error in the listing description. This sub only has RCA wired inputs.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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- Reference Front-Firing Subwoofer with revamped Spun-Copper thermoformed crystalline Polymer woofers

- Reference Front-Firing Subwoofer with revamped Spun-Copper thermoformed crystalline Polymer woofers

Product ID: 505664823

Details

Audio Output Mode
Surround
Brand
Klipsch
Connectivity Technology
Speaker Wire
Frequency Response
120 Hz
Speaker Maximum Output Power
400 Watts

⚡All-digital amplifier with 400W power

🔊12” spun-copper woofer for deep bass

🎛️Low-pass crossover & phase control

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$2127.54

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Details

Audio Output Mode
Surround
Brand
Klipsch
Connectivity Technology
Speaker Wire

Description

🎶 Feel the bass, own the room — Klipsch R-121SW, where power meets precision.

DURABLE SLEEK CABINET - Scratch-resistant MDF with advanced bracing reduces vibration while adding a modern, minimalist aesthetic.
FLEXIBLE FRONT FIRING DESIGN - Place your subwoofer anywhere with confidence—deep bass performance that adapts to your room layout.
CUSTOMIZABLE BASS INTEGRATION - Fine-tune your sound with low-pass crossover and phase controls to perfectly blend with your Klipsch speakers.
PRECISION ALL DIGITAL AMPLIFIER - Delivers 400 watts of high-efficiency power for true-to-source sound accuracy and room-shaking impact.
POWERFUL 12 SPUN COPPER WOOFER - Experience ultra-light, distortion-free bass that fills your space with crystal-clear low frequencies.

The Klipsch Reference R-121SW is a premium 12-inch front-firing subwoofer featuring a lightweight spun-copper thermoformed crystalline polymer woofer and a 400W all-digital amplifier. Designed for audiophiles and home theater enthusiasts, it offers distortion-free deep bass, customizable crossover and phase controls, and a durable, vibration-resistant cabinet. Perfectly compatible with AV receivers and Klipsch speakers, it delivers immersive, room-filling sound with a sleek, modern look.

Specifications

ASIN	B09P8WJTB3
Additional Features	Digital Amplifier
Antenna Location	For Televisions
Audio Driver Size	12 Inches
Audio Driver Type	Bass Driver
Audio Output Mode	Surround
Best Sellers Rank	#23,966 in Electronics ( See Top 100 in Electronics ) #34 in Home Audio Subwoofers
Brand	Klipsch
Built-In Media	Speaker
Color	Black
Compatible Devices	Television
Compatible with Vehicle Type	Car
Connectivity Protocol	Bluetooth
Connectivity Technology	Speaker Wire
Control Method	Touch
Controller Type	Touchpad
Customer Reviews	4.7 out of 5 stars 181 Reviews
Enclosure Material	Copper
Frequency Response	120 Hz
Is Electric	Yes
Is Waterproof	False
Item Dimensions D x W x H	19.7"D x 16"W x 16.6"H
Item Weight	34.2 Pounds
MP3 player	No
Manufacturer	Klipsch
Model Name	R-121SW
Model Number	R-121SW
Mounting Type	Floor Standing
Number Of Circuits	1
Number of Audio Channels	5.1
Number of Items	1
Number of Power Levels	1
Power Source	Corded Electric
Series Number	12
Speaker Maximum Output Power	400 Watts
Speaker Size	12 Inches
Speaker Type	Subwoofer
Specific Uses For Product	Television, Home Theater, Movie Theater
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	12 Inches
UPC	743878046786
Unit Count	1.0 Count
Warranty Description	5 year manufacturer
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	12 Inches

Reviews

W**M

6.01.2026

A**R

3.03.2026

C**R

7.03.2026

E**L

26.02.2026

J**F

10.06.2025

B**Y

28.12.2024

P**.

24.03.2026

P**U

9.01.2026

K**D

26.01.2026

E**O

18.10.2024

高**之

1.10.2024

A**R

7.02.2026

C**H

15.10.2025

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$2127.54

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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TrustScore 4.5 | 7,300+ reviews

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