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

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

Product ID: 734117608

Details

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

🔈12-inch TCP woofer

🔊200W peak power

🎛️All-digital Class D amp

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R$1284419

Duties & taxes included

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your home theater with bass that speaks louder than words!

POWERFUL 200 W OUTPUT - Feel every beat with room-shaking bass that commands attention.
SEAMLESS INTEGRATION - Plug-and-play compatibility with your Klipsch system and TVs for instant audio elevation.
FLEXIBLE ROOM PLACEMENT - Rear port design adapts seamlessly to your space, maximizing bass impact without clutter.
ADVANCED CLASS D AMPLIFIER - Experience crystal-clear, distortion-free sound with cutting-edge digital efficiency.
12 THERMOFORMED CRYSTALLINE POLYMER WOOFER - Lightweight yet robust driver delivers deep, precise bass for immersive home theater vibes.

The Klipsch Reference R-121SW is a high-performance 12-inch subwoofer featuring a lightweight Thermoformed Crystalline Polymer woofer and a built-in all-digital Class D amplifier delivering up to 200 watts of powerful, distortion-free bass. Designed for flexible placement and seamless integration with home theater systems, it transforms your audio experience with deep, precise low frequencies.

Specifications

ASIN	B09P8WJTB3
Additional Features	Digital Amplifier
Age Range Description	Adult
Amazon Bestseller	#249,184 in Electronics ( See Top 100 in Electronics ) #91 in Home Audio Subwoofers
Antenna Location	For Smartphones or Tablets, TV Sarah
Audio Driver Size	12 Inches
Audio Driver Type	Bass Driver
Audio Output Mode	Surround
Brand	Klipsch
Built-In Media	-----
Color	Black
Compatible Devices	Television
Compatible with Vehicle Type	Car
Connectivity Protocol	Bluetooth
Connectivity Technology	Auxiliary, RCA
Control Method	Remote
Controller Type	Touchpad
Customer Reviews	4.8 4.8 out of 5 stars (134)
Enclosure Material	Copper
Frequency Response	120 Hz
Is Electric	Yes
Is Waterproof	False
Item Dimensions D x W x H	50D x 40.6W x 42.1H cm
Item Type Name	Subwoofer
Item Weight	15.51 kg
MP3 player	No
Manufacturer	Klipsch
Model Name	R-121SW
Model Number	R-121SW
Mounting Type	Tabletop Mount
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	TV Home Theater Movie Theater
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	30.48 Centimeters
Tweeter Diameter	0.75 Inches
UPC	743878046786
Warranty Description	1 Year Manufacturer's Warranty
Warranty Type	1 Year Manufacturer's Warranty
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	12 Inches

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