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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Description

🎶 Feel the Power, Own the Room.

CUSTOMIZABLE BASS CONTROL - Fine-tune low-pass crossover and phase settings to perfectly blend with your Klipsch system.
SLEEK FRONT FIRING DESIGN - Flexible placement with a stylish, low-profile grille that complements any modern setup.
PRECISION ALL DIGITAL AMPLIFIER - Harness high-efficiency power that delivers crystal-clear, true-to-source audio every time.
IMMERSIVE 12 SPUN COPPER WOOFER - Experience thunderous bass with ultra-light, distortion-free sound that fills your space.
ROBUST VIBRATION RESISTANT CABINET - Scratch-resistant MDF with advanced bracing ensures pure sound without unwanted resonance.

The Klipsch Reference R-121SW is a premium 12” front-firing subwoofer featuring spun-copper thermoformed crystalline polymer woofers for lightweight, distortion-free bass. Its built-in all-digital amplifier delivers efficient, high-fidelity sound with customizable low-pass crossover and phase controls for seamless integration. Housed in a durable, vibration-resistant cabinet with a sleek low-profile grille, it’s designed to elevate any audio setup with deep, precise bass.

Specifications

Audio Driver Size	12 Inches
Is Waterproof	FALSE
Color	Black
Water Resistance Level	Not Water Resistant
Subwoofer Diameter	12 Inches
Speaker Type	Subwoofer
Woofer Diameter	12 Inches
Controller Type	Touchpad
MP3 player	No
Additional Features	Digital Amplifier
Control Method	Touch
Warranty Type	Full Warranty
Speaker Size	12 Inches
Audio Output Mode	Mono
Antenna Location	For Televisions
Enclosure Material	Copper
Mount Type	Floor Standing
Speaker Maximum Output Power	400 Watts
Compatible Devices	Television
Compatible with Vehicle Type	Car
Item Weight	34.2 Pounds
Item Dimensions D x W x H	19.7"D x 16"W x 16.6"H
Unit Count	1.0 Count
Connectivity Technology	Speaker Wire
Connectivity Protocol	Bluetooth
Subwoofer Connectivity Technology	Wired
Frequency Response	1.2E+2 Hz
Is Electric	Yes
Power Source	Corded Electric

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