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MartinLogan SW2-TRD

Wireless subwoofer adapter kit

29 Reviews | 3 questions - 12 answers

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Our take on the MartinLogan SW2-TRD

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. 

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.

What's in the Box:

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

30-40ft away and perfect. Best part is after you hook up- you forget they are there.

Christopher, Rockledge, FL


MartinLogan SW2-TRD Reviews

Average Customer Review(s):

(29 Reviews)
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Hands-on research

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. The SWT-2 Receiver/Transmitter Combo Pack only supports wireless transmission to one power subwoofer.

Note: You cannot connect additional wireless receivers or transmitter to this system.

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

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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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

My wife hates seeing wires. [ Tschanen  Sep 23, 2018 ]
I know the brand and wanted quality in this application as it's driving a $3000 sub. [ Mike  Sep 06, 2018 ]
Highly reviewed [ Thomas/Philip  Jul 18, 2018 ]
need to move my subwoofers [ Mike  Jul 06, 2018 ]
I tried another brand and had constant issues with the signal dropping and making the subwoofer pop. I returned the product and purchased the MartinLogan based on the positive reviews by Crutchfield customers. [ Concours14  Jun 19, 2018 ]
I have their 15" sub [ G  Jun 14, 2018 ]
Don't like the idea of wireless audio, but wires running across the room wasn't an option and I heard these were the best wireless adapter. [ Sagar  May 10, 2018 ]
Because there were complete review. [ Keith  May 03, 2018 ]
Flexibility in subwoofer location [ Guest  Mar 31, 2018 ]
Had good reviews. I trust Crutchfield to stand behind product if I have issues. [ Jerry  Mar 27, 2018 ]
It was the best rated one and I like Martin Logan products. I think there is good quality in there products [ JERRY N  Mar 12, 2018 ]
I have researched many wireless receiver/ transmitter devices for powered subwoofers and the Martin Logan has the most consistent positive reviews. I also wanted a device(s) that did not have to be in "Line of Site" of each other. I'll let you know after some time how it performs! [ Quentin  Dec 28, 2017 ]
Good reviews from previous buyers and it's a Martin Logan! [ Robert  Nov 06, 2017 ]
Positive reviews [ JOHN  Oct 15, 2017 ]
Need to connect my sub wirelessly. Researched LOTS of other options, and this one had the best reviews, by far! Wanted quality, dependability, and ease of use. [ Wm  Jul 31, 2017 ]
Only option, though overpriced, that seems to be available and have consistent positive reviews about performance. Arguably should be about a $50 item given what it really is. [ David  Jul 23, 2017 ]
I chose this hoping it works better than the rocketfish item it will be replacing. If not, I'll be returning this as well and pulling a cable [ Paul  Apr 18, 2017 ]
Looking for high quality wireless subwoofer adapter and impressed by number of positive reviews VI's a VI's other options. [ Charles  Mar 26, 2017 ]
Move my sub [ Rod  Mar 24, 2017 ]
It should solve a problem with subwoofer placement. Reviews are good so we will see for ourselves. [ Craig  Dec 21, 2016 ]
Again, bought this a couple years ago. I needed them to hook up the Definitive sub woofer I bought. [ MARK  Nov 29, 2016 ]
Just installed wood flooring and the sub woofer is in the back...have to go wireless [ James  Mar 19, 2016 ]
ML makes good quality speakers and I needed the wireless adapter for a high quality sound system. [ CHARLES  Mar 10, 2016 ]

3 questions already asked

Good question.. I set mine up completely out of sight of each other and it works great. The sender is behind a glass panel and the speaker is behind a chair. I didnt try putting it inside a cabinet though... [ Pete  Dec 28, 2017 ]
Mine is the line of sight. But I believe the components can be hidden behind cabinets etc and still work as long it is not Metal Cabinets to interfere with the transmitted signals. [ DAVID  Dec 28, 2017 ]
No they don't have to be in site. [ RAMAN  Dec 28, 2017 ]
The transmitter and receiver do NOT have to be in line of sight to function properly. The transmitter can be placed in a cabinet and still function without delay [ SHAYNE  Dec 28, 2017 ]
One of ours is inside the cabinet and the other i velcrowed to the back of the sub. Paired it once and they are not in line of sight. Works like a charm, a bit pricy but worth not having to have it hard wired. [ Ted  Dec 28, 2017 ]
Line of site is not needed. For ours, the transmitter is inside a cherry cabinet, th receiver is behind the subwoofer; which is about 15' away. Works great! [ Lisa  Dec 28, 2017 ]
Not sure mine are not really in line of sight and still work but not behind a cabinet [ Roger  Dec 28, 2017 ]
Don't need to be in line of sight. I have them hidden, work perfect [ Nikunj  Dec 28, 2017 ]
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 ]