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 bass, own the room.

FLEXIBLE PLACEMENT - Rear ported design and compact tabletop mount fit seamlessly into any room layout without compromising sound quality.
EFFICIENT POWERHOUSE - Built-in all-digital Class D amplifier pumps out 200W RMS (400W peak) for crystal-clear, high-fidelity bass with maximum energy efficiency.
SLEEK DURABLE DESIGN - Robust copper material and elegant black finish ensure your subwoofer looks as premium as it sounds, backed by a 1-year manufacturer warranty.
SEAMLESS COMPATIBILITY - Optimized for 5.1 surround sound setups and compatible with TVs, smartphones, and tablets for versatile entertainment options.
DEEP ROOM FILLING BASS - 12-inch Thermoformed Crystalline Polymer woofer delivers powerful, distortion-free low frequencies that transform your home theater experience.

The Klipsch Reference R-121SW is a premium 12-inch subwoofer featuring a lightweight yet durable Thermoformed Crystalline Polymer woofer and a powerful 200W Class D digital amplifier. Designed for home theater enthusiasts, it delivers deep, distortion-free bass with flexible placement options and broad device compatibility, all wrapped in a sleek black copper finish.

Specifications

Mounting Type	Tabletop Mount
Material	Copper
Model Name	R-121SW
Speaker Type	Subwoofer
Special Feature	Digital Amplifier
Recommended Uses For Product	For Smartphones or Tablets, For Televisions
Compatible Devices	Television
Subwoofer Diameter	30.48 Centimeters
Surround Sound Channel Configuration	5.1
Color	Black
Included Components	-----
Product Dimensions	50D x 40.6W x 42.1H cm
Item Weight	15.51 kg
Is Waterproof	False
Warranty Type	1 year manufacturer warranty
Number of Items	1
Control Method	Remote
Wireless Communication Technology	Bluetooth
Speaker Size	12 Inches
Power Source	Wire
Item model number	R-121SW
Color Name	Black
Speaker Amplification Type	Active
Material Type	Copper
Output Wattage	200 Watts
Wattage	200 W

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Klipsch Reference R-121SW / Klipsch / Reference / Subwoofer / Black / Subwoofer / Built-in Amplifier / Class D / 12" / Home Theater

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