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MartinLogan SW2-TRD

Wireless subwoofer adapter kit

Item #: 839SW2TRD

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7 Reviews | 2 questions - 4 answers

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Make your sub go wireless

Want to enjoy the deep, rumbling bass of your subwoofer without a long cable run from your receiver? Pick up the MartinLogan SW2-TRD wireless transmitter and receiver, and transform your wired sub into a wireless unit. Simply connect the transmitter to your receiver's subwoofer preamp output. Then connect the receiver to the LFE input on your subwoofer. With a wireless range of up to 40 feet, you'll have more placement options to help you enjoy powerful bass to add depth to movies and music. 

The SW2-TRD transmitter and receiver each include an AC adapter for power. Be sure to plug them into a quality power protection device to protect your equipment from damaging surges.

Product Highlights:

  • includes wireless transmitter and receiver for use with powered subwoofers
  • compatible with any brand of subwoofer with mono or stereo RCA inputs
  • wireless range: up to 40 feet
  • 16-bit/48kHz resolution/sampling rate
  • operates on 2.4GHz wireless band
  • includes AC adapter for each unit
  • warranty: 3 years (with product registration)
  • Our 60-day money-back guarantee
  • Some MartinLogan subwoofers feature a built-in wireless receiver and come with a transmitter for out-of-the-box wireless capability. These models include the Dynamo 700W and Dynamo 1000W.

MartinLogan SW2-TRD Reviews

Average Customer Review:

7 Reviews

Plug and Play

Written by: Katy, TX from katy, TX on January 20, 2016

Crutchfield Customer Review (What's this?)

Plugged it in, hit the pair buttons & poof away it went. My sub is a Klipsch - Reference 10" 300W

Pros: Even I made it work!

Cons: $$$$

Nice Solution

Written by: tbone from California on December 13, 2015

Crutchfield Customer Review (What's this?)

Happened upon this product looking to solve subwoofer placement issue. I can say that this has been a pleasant experience. The set-up and install of this product was a breeze. I did have to purchase connectors to fit my sub woofer. The joy of installing my sub woofer discretely and wirelessly in the listening area is fantastic.

Pros: Works as advertised, easy to install


Meh not bad

Written by: Anonymous from Knoxville, TN on June 2, 2015

Crutchfield Customer Review (What's this?)

This is a little expensive for the price and should come standard on all ML subs (which it doesn't). The audio is seamless with no distortion but my only gripe was a constant clipping/popping sound. They say in the manual that this is from electrical interference and to keep it away from Wifi signals. How am I supposed to do this when the sub needs a wall outlet and the other half is connect to my amp (which has wifi) and so close to the PS3?

Pros: No more wire!

Cons: Clipping/popping sound from interference. Expensive

Solid equipment

Written by: TG from Pennsylvania on May 29, 2015

Crutchfield Customer Review (What's this?)

This is a solid addition to a sound system if you have to place a subwoofer away from your receiver. It was easy to set up and so far it works flawlessly

Pros: Ease of set up. works well

Cons: There is a distracting bright blue light on the transmitter. I have a glass fronted equipment case so I had to use electric tape to cover the light so it did not turn the entire case a blue hue. Minor complaint but its all I got.

Works flawlessly

Written by: TVL813 from Tampa, FL on April 12, 2015

Crutchfield Customer Review (What's this?)

Simple setup. Works great. No lag. Highly recommended.



MartinLogan SW2-TRD

Written by: Anonymous from Las Vegas on March 24, 2015

Crutchfield Customer Review (What's this?)

Easy to set up with good response

Pros: Works well

Cons: Price

Excellent Solution

Written by: Tom from New York on January 2, 2015

Crutchfield Customer Review (What's this?)

Excellent Product. Set up easily & quickly. Sound is excellent.

Pros: Easy Setup. Very good sound quality.

Cons: A little expensive.

Hands-on research

What's in the box?

  • Wireless transmitter
  • Wireless receiver
  • 2 AC power adapters (w/ attached 6' DC cord)

Product Research


Wireless Sub Receiver/Transmitter Combo Pack: Although correct placement plays a key role in optimizing subwoofer performance, sometimes it imposes the inconvenience of running long lengths of cable through walls, along baseboards, or under floors and carpets. To solve the problem, MartinLogan designed the SWT-2 Receiver/Transmitter Combo Pack which allows you to place your subwoofer in the exact location where it will deliver the best bass without the cable clutter.

Compatibility: The MartinLogan SWT-2 wireless receiver/transmitter combo can be added to any AV receiver with an LFE/RCA output and any powered subwoofer with LFE/RCA input.

Uncompressed Audio Signal: MartinLogan engineers designed the SWT-2 with an uncompressed 16-bit/48-kHz sampling rate (exceeding the current CD standard of 16-bit/44.1-kHz), which proved more than adequate for use in the wireless transmission of low-frequency information below 200 Hz. And since the RF transmission is digital it is error-checked to ensure no deviation from the original signal.

2.4GHz Frequency Range: The SWT-2 operates in the 2.4GHz frequency range. Often, users of wireless technology complain about interference from other noise sources in the room (i.e. wireless local area networks, portable phones on the same frequency, even microwave ovens). MartinLogan engineers included an integrated RF power amplifier that provides a 15 dBm RF power level to reduce interference. Stray RF interference is also reduced through use of Adaptive FHSS operation.

40' Range: In a typical room situation, the SWT-2 receiver/transmitter combo has a maximum unobstructed operating range of 40' (12.5m) depending on placement of course. If desired, its compact dimensions allow it to fit neatly into an audio/video rack.

RCA Connectors: Both the wireless transmitter and wireless receiver are fitted with stereo RCA jacks. The wireless transmitter plugs into the sub or LFE output of your home receiver or active soundbar speaker via stereo RCA (cable not included). The wireless receiver plugs into the sub or LFE input on your powered subwoofer via stereo RCA (cable not included).

AC Power Adapters: The SWT-2's receiver and transmitter include an AC power adapter which will need to be plugged into an AC wall outlet.

  • Input: 100-240V ~ 60/50Hz, 1.5A
  • Output: 5V-1A

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

2 questions already asked

I used a high quality, standard audio cable and it works great. This is an audio signal that you are transmitting, so you want to use something reasonably high quality, but it doesn't have to be over the top. [ Thomas  Dec 15, 2015 ]
I really don't think you have to spend a great deal of money. I would say middle of the road will do. [ Tyrone  Dec 15, 2015 ]
Sorry, I don't know. Mine is solely connected to the TV. [ Jona  Jan 16, 2014 ]
I'm not sure, but think you would be able to double the available subwoofer connections by connecting RCA "Y" connectors onto both RCA outputs on the receiving wireless module that essentially would double the available subwoofer connections. I'm sure Crutchfield or a local electronics store carries the RCA "Y" adapter. Good luck. [ GARY C  Jan 05, 2014 ]

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