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MartinLogan Dynamo™ 700W

Wireless powered subwoofer

Item # 839DY700B

Ever have trouble finding the perfect spot for your sub? Well, with MartinLogan's Dynamo 700W subwoofer,...

Read more from Crutchfield writer, David B.

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About the MartinLogan Dynamo™ 700W

A sub that fits where you want it

Ever have trouble finding the perfect spot for your sub? Well, with MartinLogan's Dynamo 700W subwoofer, you'll have lots of options. This versatile sub's standard down-firing setup is perfect for placing it in corners or along side walls. But if you're looking for a more discreet placement such as in a cabinet with your other home theater gear, you can easily convert it into a front-firing sub by simply removing and reorienting its detachable feet.

A sub that fits where you want it

Ever have trouble finding the perfect spot for your sub? Well, with MartinLogan's Dynamo 700W subwoofer, you'll have lots of options. This versatile sub's standard down-firing setup is perfect for placing it in corners or along side walls. But if you're looking for a more discreet placement such as in a cabinet with your other home theater gear, you can easily convert it into a front-firing sub by simply removing and reorienting its detachable feet.

MartinLogan Dynamo 1500X converting from front- to down-firing.

Wireless convenience right out of the box

Even if you're willing to place your sub far from your receiver, you might not want a long wire running between the two. No worries, thanks to the 700W's built-in wireless receiver and included transmitter. So you can feel those deep rumbling movie sound effects without tripping over a cable when you get up to get more popcorn.

Not just for explosive movie soundtracks

When you add a subwoofer to your full-range speaker system, your movies and music will sound fuller and more dramatic. The Dynamo 700W accomplishes this without taking up valuable real estate in your living room or home theater. The sealed enclosure is constructed of high-density materials and reinforced with solid internal bracing to minimize cabinet resonance for cleaner sound. The 10-inch speaker is driven by a high-powered built-in amplifier that delivers 300 watts of continuous, clean power. Both are optimized for low noise and distortion, to produce bass that is not only bold, but detailed and tight rather than loose and boomy. That makes this sub a great performer with movies and music — not to mention a great match with MartinLogan's fine lineup of full-range speakers.

MartinLogan Dynamo 700W powered subwoofer with wireless transmitter

The Dynamo 700W's detachable feet let you easily orient the woofer in a down- or front-firing configuration.


Product highlights:

  • wired or wireless connection options with built-in wireless receiver and included transmitter
  • frequency response: 24-200 Hz (±3dB)
  • built-in amplifier delivers 300 watts of continuous power, 600 watts peak output
  • ultra-efficient variable audio tracking power supply drives a class AB output stage for lower distortion and noise than typical Class D switching amps
  • 10" polypropylene woofer cone
  • sealed (acoustic suspension) cabinet with convertible front- or down-firing design
  • continuously variable low-pass 35-120 Hz crossover
  • rear-mounted 3-position phase switch, volume level, and crossover controls
  • auto on/off
  • line-level/LFE RCA input
  • included Energy Transfer Coupler (ETC) spikes can be used for tighter coupling between subwoofer and floor to enhance sound quality
  • black ash finish
  • 11-11/16"W x 12-9/16"H x 12-7/8"D (down-firing orientation); 11-11/16"W x 13-1/2"H x 12-5/16"D (front-firing orientation)
  • weight: 26.5 lbs.
  • warranty: 3 years (with product registration)
  • Our 60-day money-back guarantee
  • MFR # DYN700WD

What's in the box:

  • Powered subwoofer
  • Wireless transmitter (SW-T)
  • AC power adapter (w/ attached 6' DC cord)
  • 10' AC power cord
  • Cloth grille
  • 4 Pre-installed rubber feet
  • 4 Spiked feet
  • 2 Right-angle RCA adapters
  • User's Manual (En/Fr)
  • Product Registration Card

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

Customer reviews

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MartinLogan Dynamo™ 700W Reviews

Average Customer Review(s):

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More details on the MartinLogan Dynamo™ 700W

Features & specs

Enclosure Acoustic Suspension
Video Shielded No
Woofer Size (inches) 10
Woofer Composition Poly
Firing Direction Down/Front
Wireless Yes
Preamp-Level Inputs Yes
Speaker-Level Inputs No
Speaker-Level Outputs No
Low-Pass Crossover Freq 35-120
High-Pass Crossover Freq N/A
Phase Switch Yes
Amplifier Output (watts) 300
Frequency Response 24-200 Hz
Height (inches) 12-9/16
Width (inches) 11-11/16
Depth (inches) 12-7/8
Weight 26.5 lbs
Speaker Parts Warranty 3 Yrs w/ Registration
Speaker Labor Warranty 3 Yrs w/ Registration
Amplifier Parts Warranty 3 Yrs w/ Registration
Amplifier Labor Warranty 3 Yrs w/ Registration

Product Research


Dynamo Series Powered Subwoofer: The MartinLogan Dynamo 700w powered subwoofer offers audiophile grade performance and home-friendly aesthetics. Featuring a high-current 300-watt RMS (600-watt peak) amplifier and a 10" cone driver, the Dynamo 700w delivers deep, tight, effortless bass for movie and music soundtracks. It can be configured as a down-firing or front-firing powered sub. The 700w offers both a wired and wireless powered subwoofer connection to your home AV entertainment system.

Advanced, Ultra-Efficient 300-Watt Amp: The Dynamo 700w's ultra-efficient, high-power amplifier uses variable audio tracking power supplies to drive its class AB output stage. With lower distortion and less noise than typical Class D switching amplifiers, this advanced design allows the amplifier to operate at much higher efficiencies than a typical class AB amplifier, delivering a true 300-watts of continuous power (600-watts peak).

High-Resolution, Low-Distortion 10" Woofer: The Dynamo 700w's advanced-technology driver pairs a high-power magnet structure with a 10" poly diaphragm to deliver huge excursion and sound output while perfectly preserving the tiniest bass detail; and all without a hint of distortion. The exceptional damping properties of the poly cone material also ensure the smooth, non-resonant response necessary for truly seamless blending with MartinLogan's electrostatic panel and Folded Motion driver technologies found in their loudspeakers.

Inverse Mathematical Equalization (IME) Filtering: An IME filter is derived from the inverse of the unfiltered driver response. Precision IME filtering yields extremely accurate low-frequency response; far superior to that provided by the simple second-order high-Q filters typically found in subwoofers in this price range.

Sealed Cabinet w/ Internal Bracing: On the outside, the Dynamo 700w's cabinet is constructed from the finest composite material for acoustic integrity. Inside, critically placed structural cross-bracing acts an excellent baffle for the woofer while the added rigidity keeps cabinet-induced resonances and non-linearities to inaudible levels. As a result the MartinLogan Dynamo 700w maintains a smooth, consistent response regardless of music or movie source material.

Front-Firing or Down-Firing Configuration: To maximize performance when installed inside of a cabinet or other discrete installation, the Dynamo 700w's standard down-firing configuration easily converts into a front-firing orientation; no tools required. A grille cover and 90-degree RCA adaptors are provided for use in front-firing applications. Dimensions:

  • Down-Firing Orientation (default): 11.6875" (w) x 12.5625" (h) x 12.875" (d)
  • Front-Firing Orientation: 11.6875" (w) x 13.5" (h) x 12.3125" (d)
Note: If placing the powered subwoofer inside of a cabinet, it is recommended that there be a minimum of 3" of open space between the cabinet and the front and back sides of the powered sub.

Seamless System Integration: Comprehensive connection options, low-pass filtering, and phase control make integrating the Dynamo 700w subwoofer into a multi-channel home theater or stereo music setup simple and seamless. The main left/right line-level inputs feed into a precision low-pass filter with a cut-off frequency variable from 35 to 120 Hz. For systems in which the AV receiver supplies the low-pass crossover, the Dynamo 700w offers an LFE input that bypasses its internal filters. The phase control can be set to 0, 90, or 180-degrees.

Built-in Wireless Receiver: 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, the Dynamo 700w incorporates a wireless receiver (digital RF transmission) for use with the included SWT-2 MartinLogan Subwoofer Wireless Transmitter which plugs into the subwoofer or LFE output of your home receiver or active soundbar speaker via stereo RCA (cable not included).

Note: You cannot add additional wireless receivers, transmitters, or subwoofers to this system.

Energy Transfer Coupler (ETC) Spikes: The Dynamo 700w comes with custom ETC spikes which can be used along with the pre-installed rubber feet to enhance stability on thick carpets, or create tighter coupling between subwoofer and floor to enhance overall sound quality. The spiked feet add 0.625" of height to the powered sub.

Auto Power On/Off: The powered subwoofer will automatically enter a power saving mode when no audio signal is detected. The subwoofer will automatically come out of power saving mode when an audio signal is detected.

Break-In Period: The Dynamo 700w woofer requires approximately 50 hours of break-in at moderate listening levels before its optimal performance occurs. This will factor in on any critical listening and judgment.

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Customer Q&A

Crutchfield asked: Why did you buy this?
Recommended by a friend [ Melvin P.  Mar 08, 2019 ]
Replaced a Polk subwoofer I bought in 1996 and am very pleased. So pleased in fact that I am replacing a Polk subwoofer I bought in 2015 [ ROBERT V  Feb 27, 2019 ]
Manny helped me with the selection. He was very helpful. [ Michael  Feb 24, 2019 ]
wireless feature, sound quality, and price [ Stephen  Feb 22, 2019 ]
Great Reviews & Price Point [ Peter  Feb 10, 2019 ]
Recommended by advisor. [ Edward  Feb 07, 2019 ]
to match my center channel speaker [ robert  Jan 29, 2019 ]
wireless [ DONALD L  Jan 26, 2019 ]
I need a down firing sub and I already have ML speakers. [ JACK  Jan 24, 2019 ]
Really feel this would complete my theatre system. As well as complament my Elac UB-5. [ Jeffery  Jan 17, 2019 ]
The reviews were good, I needed a wireless powered sub and it was on sale. It was between this at $399, the Klipsch Reference R-10SWi at $249 and the SVS PB-1000 which came in at $499 + $120 for the wireless connector. SVS is supposed to be better but I dont think $220+ better. Gives me flexibility of moving it and has front/down firing settings. Spoke to a very helpful young lady. Still yet to receive the items. [ James  Jan 14, 2019 ]
I have a pair of Martin Logan speakers. It seemed like a nice match. [ Robert  Jan 01, 2019 ]
Sealed unit & wireless [ GLEN E  Dec 31, 2018 ]
to add tight low bass [ K  Dec 30, 2018 ]
i chose the Dynamo 700 because I have one already adding a second unbelievable scratch and dent price ! [ RICHARD  Dec 30, 2018 ]
I check Crutchfield first when looking for audio equipment. The Martin Logan subwoofer I purchased has great reviews, and is a sealed sub, a good choice for music enhancement. [ Dave500  Dec 29, 2018 ]
Seemingly a reasonable performing fairly compact subwoofer from a reputable manufacturer for a nice price. [ DALLAS  Dec 18, 2018 ]
Gift request for son [ Beverly  Dec 13, 2018 ]
Looking for a high quality 2.1 setup as an alternative to towers - love Crutchfields 60day test period to make sure the sound works in our living room. Have always turned to Crutchfield 1st for audio help. [ JEREMY  Dec 09, 2018 ]
I read good reviews on it and the price is great. [ Mark  Dec 04, 2018 ]
Value, Optional installation option, wireless option [ DOMENIC  Dec 02, 2018 ]
Reviews & Price discount. [ Ryan  Nov 28, 2018 ]
Adviser recommendation [ S  Nov 23, 2018 ]
Buddy's advise [ Anthony  Nov 23, 2018 ]
This was a great offer for a replacement sub. My 10-year old sub started rattling on the new Jurassic Park - w/ an offer of 50% off on this MLD 700W, we can get back to shaking the walls and not the old sub's bones. [ Harry  Nov 20, 2018 ]
based on reviews [ Scott  Nov 17, 2018 ]
GOOD REVIEWS,GOOD BRAND [ booneslick  Nov 12, 2018 ]
Price and specifications. [ Kenneth  Nov 09, 2018 ]
Addition to existing speakers fro Martin Logan [ KurtJ  Aug 22, 2018 ]
Matches up well with my ML 20 speakers [ Donnie  Aug 02, 2018 ]
Have the Motion Vision Sound bar [ Jeffrey  Jul 24, 2018 ]
your adviser Larry helped me make the decision [ John  Jul 21, 2018 ]
Installing in my RV and wireless adapter will give flexibility in placement so I can hide this sub in any corner. [ Steven  Jul 11, 2018 ]
Wireless! [ Michael  Jul 05, 2018 ]
Already have one and very happy so why not two :) [ JULIUS R  Jun 29, 2018 ]
I don't have a home theater and I use audio equipment only for music listening. My setup employs two Martin Logan 35xt bookshelf speakers. I picked this sub because reviewers have praised it for its tight bass. I listen mainly to classical music and jazz ,and my highest priorities are clarity and detail. The last thing I want is boomy bass. I'm hoping that because it is a Martin Logan product it will blend well with my other ML speakers. [ joel  Feb 09, 2018 ]
to match my other martin logan subwoofer [ Harold Joe  Jan 29, 2018 ]
smooth performance... complements Martin Logan Motion speakers [ Alfonso  Dec 17, 2017 ]
Free [ mike  Dec 06, 2017 ]
suppose to be compatible with my martin logan motin vision sound bar and the reviews were good [ james  Nov 13, 2017 ]
Crutchfield advisor and ML support both consider most musical sub just to extend low end of soundbar and not to add sonic boom, [ H  Aug 22, 2017 ]
Powerful enough for my mini Theater room of 11x14. Seats 8 people with Dolby ATMOS [ RUT  Aug 14, 2017 ]
Great pro reviews [ Jason  Jul 01, 2017 ]
I was looking for a solid, small sized, high quality subwoofer [ Ronald  Apr 22, 2017 ]
wireless, user reviews, good brand [ DAVID BRADFORD  Mar 19, 2017 ]
add on martin logan vision sound bar to achieve better sound [ Elbert  Mar 10, 2017 ]
Was highly recommended as one of the 10 best subs at $1000 or less [ Bill  Dec 26, 2016 ]
Excellent Martin Logan sound bar bought from Crutchfield and wanted to enhance my system by purchasing the Martin Logan subwoofer [ J G  Sep 03, 2016 ]
Has very good reviews and believe it will be a good fit with my other Martin Logan speakers [ Terry  Aug 15, 2016 ]
best match for my system (Marantz SR6010) when added as a 2nd sub. Otis was a tremendous help and he really acted in my best interest. Thanks Otis' Bio: [ Joel  Apr 30, 2016 ]
Wireless subwoofer with great reviews. All research points to this sub as a winner. [ Mark  Mar 28, 2016 ]
matches my surround system which is all Martin Logan [ Linda  Mar 01, 2016 ]
Looked like what I needed [ Steven  Jan 01, 2016 ]
Great sounds [ CINDI  Dec 13, 2015 ]

5 questions already asked

does this model come in white color? if not can it be painted? what about grill cloth? wife needs it to blend in with decor!!??
[ Ralph  Nov 06, 2017 ]
4 answers
I'm sorry I don't know. I have ML speakers and the finish on them is incredible. So unless you are very talented or want to have a professional paint them I wouldn't bother. They are like a very expensive piece of furniture.
[ Glen  Nov 09, 2017 ]
Disregard the Bose recommendation. The Definitive Technology Prosub 800 in white is a proper recommendation for a powered sub.
[ Rodney  Nov 07, 2017 ]
It does not come in white. It can be painted but i would go a different route. I would remove the control panel and woofer, take the cabinet to an automotive shop that does vinyl wrap and have them wrap it. Reinstall the components and put the legs on to configure the woofer in the down firing position. Another option is to go with a white Bose Acoustimass 300.
[ Rodney  Nov 07, 2017 ]
[ ADRIAN  Nov 06, 2017 ]
Can two of these be connected wirelessy to a capable receiver? I have an Yamaha RX-A3070 receiver and would like dual subs for my system. Thanks.
[ Jared  Aug 27, 2017 ]
1 answer
If that receiver has either two outputs to right and left or front and rear dedicated to sub woofers.The answer is yes.If it does not have but one sub out then you would have to connect between L and R or Back to front main spkrs and that would possibly interfere with the mains spkrs dynamics.GL,BC
[ Bret  Aug 28, 2017 ]
I'm using an old receiver, a Nakamichi Stasis TA 3A as a preamp with my beloved Adcom 555 amp. Spk wire already run under the carpet to my 2 Coincident spkrs. How would I hook this up? Long RCA cables across the room are not an option. Thanks. John from Texas
[ John  Feb 09, 2017 ]
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center:
[ Krissy  Feb 12, 2017 ]  Staff
When operating the sub in wireless mode, does the wireless transmitter have to be wired to the pre-amp/receiver?
[ Jove23  Jan 03, 2017 ]
5 answers
Yes, it has to be wired to the preamp.
[ Czeslaw  Jan 04, 2017 ]
Yes, it's a little box that you connect to your pre-outs or sub woofer out and to an 110 outlet. It has a blue pilot light as does the back of the amp/speaker. The unit goes to sleep after a short period of no signal. Actually, I can't tell the difference between this unit and the hard-wired unit I have on another system.
[ Steven  Jan 03, 2017 ]
YES.... It plugs into one of the Sub inputs on the receiver. This sub is amazing and needs time to "burn in," meaning after a few weeks of solid use it really comes into it's own! I do wish it weighed more...
[ Joel  Jan 03, 2017 ]
Yes, you plug it into the sub pre-out just like you would normally do with the subwoofer. You also need to plug it into an outlet for power.
[ Michael  Jan 03, 2017 ]
yes, the transmitter transmits the signal wirelessly to the sub.
[ Joshua  Jan 03, 2017 ]
How do I size a receiver for this?
[ Brandt  Nov 19, 2015 ]
6 answers
I'm not really sure how to answer this except to say that mine is matched up to a McIntosh MA 5200 and it works just fine, but the room is rather small (14x14 w 10' ceiling) so I don't crank the sub up but a little.
[ Steven  Nov 20, 2015 ]
Yo don't. It has a built in amp. You size the sub to the room.
[ JEFFREY  Nov 20, 2015 ]
Unfortunately I cannot be of assistance. I purchased my speakers for a move and they are still in the factory packaging. Sorry
[ MICHAEL H  Nov 20, 2015 ]
The sub is self powered. You just need to connect to your sub pre amp out or LFE. Also this sub is wireless.
[ CALVIN L.  Nov 20, 2015 ]
Since the Dynamo is a powered subwoofer it should not draw off the receiver. I have a 8 year old H/K receiver with 75 watts per channel. I played the Saint-Saens Organ Symphony and there was absolutely no problem. The wood floor literally shook due to the down firing bass driver. It is also great due it is wireless capability with no wires running from the unit,
[ Gordon F.  Nov 20, 2015 ]
You can get any receiver. It has gain so you can shape the sound to come in soft for low power or hard for big power.
[ BRYAN  Nov 20, 2015 ]

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