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  • MartinLogan Depth i High-Performance Triple 8-Inch Servo-Control Subwoofer (Single, Black Ash) (Discontinued by Manufacturer)
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MartinLogan Depth i High-Performance Triple 8-Inch Servo-Control Subwoofer (Single, Black Ash) (Discontinued by Manufacturer)


Available from these sellers.
Black Ash
  • BalancedForce triple woofer alignment for near-total cancellation of cabinet vibrations that muddy the bass
  • Three high-resolution 8-inch aluminum cone woofers with triple servo control for ultimate precision bass
  • 25Hz Level Control (10dB) to compensate for acoustically destructive room interaction in the low-frequencies
  • Frequency response: 20120 Hz ±3dB; Anechoic through LFE effects input
  • 350 watt (900 watt peak) high-resolution amplifier
1 new from $1,499.00


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Color: Black Ash
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Product Specifications

Color: Black Ash
Brand NameMartinLogan
Color NameBlack Ash
Item Display Height17.9 inches
Depth16.5 inches
Driver Configuration3x 8 inch woofers
Frequency Response Curve20 Hz - 120 Hz
Speaker Driver Material TypeAluminum
Maximum Speaker Depth (inches)16.5 inches
RMS Power Range - Amplifiers350 watts

Technical Details

Color: Black Ash
  • ETC Spikes

Product Details

Color: Black Ash
  • Product Dimensions: 16.5 x 17.1 x 17.9 inches ; 70 pounds
  • Shipping Weight: 92 pounds
  • Shipping: Currently, item can be shipped only within the U.S.
  • Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
  • ASIN: B001VEJFA0
  • Item model number: Depth i
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (4 customer reviews)
  • Amazon Best Sellers Rank: #88,071 in Electronics (See Top 100 in Electronics)
  • Date first available at Amazon.com: April 1, 2009

Product Description

Color: Black Ash

From the Manufacturer

From the Manufacturer

MartinLogan - The Great American Speaker Company

Since 1983 MartinLogan, the great American speaker company, has hand-crafted high performance electrostatic speakers. Their award-winning designs, advanced technologies, and outstanding customer service have long made MartinLogan's amazingly detailed speakers a must have for home theater and music lovers around the world.




Depth i in a home setting

Depth i Subwoofer: Deep, Powerful, and Detailed

Depth i deploys the full array of MartinLogan's advanced subwoofer technologies to achieve deep, rich, satisfying bass while preserving accuracy and detail. Its TriLinear™ BalancedForce™ alignment, advanced low-distortion amplifier, and sophisticated triple-servo control systems extract the very best possible performance from three high-resolution 8-inch aluminum-cone drivers.

TriLinear BalancedForce technology places the subwoofer's three drivers precisely 120 degrees apart from each other in the cabinet. Their force meets at the center and exactly cancel, virtually eliminating cabinet resonance and vibration that cause muddy sounding bass in even the best conventional subwoofers. The triple-servo system, meanwhile, ensures that the output from the drivers themselves is always an absolutely faithful replica of the audio input signal.



TriLinear™ BalancedForce™ Aluminum Cone Woofers
(shown here in Natural Cherry)

Under the Hood: Making Sense of Subwoofer Technology

Rigid, Low-Mass Aluminum-Cone Diaphragms
By eliminating cone flexure, extremely rigid low-mass aluminum cones help our advanced-technology bass drivers achieve the very low distortion necessary for a superbly realistic bass performance.

TriLinear™ Driver Array
By operating three drivers in parallel, Depth i benefits from the low distortion and optimal control of their 8-inch diaphragms while achieving the equivalent acoustical output of a single massive 15-inch woofer.

BalancedForce™ Driver Alignment
Conventional subwoofer cabinets vibrate in reaction to driver activity, creating a secondary and highly colored sound source (which causes muddy sounding bass). In extreme cases, the cabinet may even 'dance' around the floor. The typical solution of adding mass to a subwoofer cabinet can make the problem less obvious, but it doesn't really make it go away. MartinLogan's BalancedForce design places multiple identical drivers in exact opposition to one another, so that their forces on the cabinet almost perfectly cancel one another.

Employing a novel application of the BalancedForce principle, Depth i locates the three drivers of its TriLinear™ array precisely 120 degrees apart on the cabinet. Their reaction force exactly balance at the center point for near-total cancellation, reducing acoustically destructive spurious cabinet radiation by as much as 25 dB (a power factor of more than 300:1).

Triple-Servo Correction System
A highly sophisticated servo control system for each driver compares the original audio signal input to the amplified woofer output and corrects for any deviation. These advanced servos combine with the drivers' inherent low distortion and their BalancedForce™ reaction-canceling alignment to yield the cleanest, most accurate bass possible.

Advanced Proprietary Vojtko™ Switching Amplifier
Depth i's amplifier belongs to a recently developed class of switch-mode designs that incorporate a variety of innovative techniques to reduce noise, distortion, and heat to the lowest possible levels. In particular, the switching frequency is much higher than in typical subwoofer amplifiers of this type. It can produce a true 350 watts continuously and 900 watts peak.



Depth i top-mounted control panel


Depth i connections

Taking Control: Flexible Inputs and Controls Make All the Difference

Comprehensive Inputs with Simultaneous-Connection Option
Depth i provides a LFE input (that bypasses the subwoofers internal crossover) for connection to surround preamp/processors and receivers that already integrate a subwoofer crossover. In addition, Depth i allows line- and speaker-level stereo inputs that connect to the subwoofers internal crossover. Both type of inputs can be connected simultaneously with separate level and crossover settings for each, enabling precise optimization for home-theater and stereo music playback in the same system - the best of both worlds.

25Hz Level Control
At very low frequencies, all rooms exhibit a phenomenon known as room gain, which produces a mild bass boost. The smaller the room, the higher the frequency at which this starts. Depth i's 25-Hz level control enables you to compensate for excessive room gain by cutting output in the 20- to 30-Hz range or, if you prefer, to accentuate the feeling of deep-bass energy by augmenting those frequencies.

Extended-Range Master Level Control
Crave a little heavy-metal thunder from time to time? Ordinary level controls top out at '10'; Depth i's goes to '11'!

Full-Rotation Phase Switch
Depth i's phase control can be switched from 0 to 270 degrees in 90-degree increments, allowing precise adjustment for optimum blending with the main speakers.

Top-Mounted Controls
It's a lot easier to dial in exactly the right settings when you don't have to get down on your hands and knees to reach the controls. Depth i's top-mounted controls, discreetly hidden beneath an aluminum cover inset into the cabinet, take the drudgery out of performance tweaking.

Energy Transfer Coupler Spikes
Depth i is supplied with sturdy, 3/8-16 thread ETC™ spikes, which can be used in place of the standard feet to enhance stability on thick carpets or to create tighter coupling between subwoofer and floor.



The Final Breakdown: Technical Specifications

Frequency Response:22-120 Hz ±3dB; Anechoic through LFE effects input
Low Pass Filter Frequencies:30, 35, 45, 55, 65, 80Hz
High Pass Filter Frequencies:70Hz
Phase:0°, 90°, 180°, 270°
25Hz Level Control:±10 dB
Woofer Type:10" (25.4cm) high excursion, aluminum cone with extended throw drive assembly, sealed non-resonant asymmetrical chamber format
Amplifier:300W, 900W (peak)
Inputs:Left/Right RCA Line Level, RCA LFE, Speaker Level
Outputs:RCA Sub Out (all inputs summed), RCA Right/Left (with High Pass Filter)
Input Impedance:20,000 Ohms
Power Draw:Max: 250 Watts
Idle: 15 Watts
Standby: 10 Watts
Weight:51 lbs. each (23.2 kg)
Dimensions (HxWxD):18.6" × 15.2" × 13.8" (47.3 × 38.6 × 35 cm)



Complete Your Home Theater with MartinLogan Front Channels (sold separately)

Vantage Speaker - Based on the state-of-the-art Summit loudspeaker, Vantage offers unprecedented performance for its size and price. Key to this achievement is our PoweredForce active woofer technology, which generates deep, articulate, dynamic bass from an astonishingly compact cabinet. An XStat electrostatic panel handles the midrange up, delivering the smooth, pristinely detailed, and richly ambient sound that is the hallmark of MartinLogan speakers. No ordinary speaker comes close.

Vista Speaker - Vista is MartinLogan's most affordable XStat equipped floorstanding speaker. Incorporating ultra-high-resolution XStat and AirFrame technologies originally developed for the cost-no-object Summit; Vista is capable of an exceptionally dynamic and realistic performance. A single aluminum cone woofer, compact cabinet, and bi-wire capable toolless binding posts further reinforce Vista's high-end pedigree. The result? A stellar performer at an exceptional price.

Fully Powered Purity Speaker - Purity is an internally powered hybrid design descended from Martinlogan's legendary, ultra performing enthusiast models. Purity represents a remarkable achievement in performance and 21st century connectivity at a really amazing price. Executing an exciting new direction, Purity is an elegant compact floor standing beauty that does it all. Combining the latest, friendliest version of MartinLogan's unique see-through electrostatic panel (world's most accurate method of sound reproduction) with 2 deep bass woofer cones in a clean lined cabinet, Purity mates ideally with any electronics for any audio use. Purity is at its best when directly connected with an RCA cable from any device with a volume control. Your computer, TV, i-pod, pre-amp, and A/V receiver will all love the marriage. Of course you may hook-up using conventional speaker wire if your system so requires.

Source Speaker - Source is an elegant, compact floor standing beauty that does it all. Combining the latest version of MartinLogan's unique "see-through" electrostatic panel (the world's most accurate method of sound reproduction) with a deep bass woofer cone in a clean lined cabinet, Source mates ideally with nearly any of your electronics, for any use. Beyond delivering stunning, accurate play back of all types of stereo music, or incorporated as the star in your 5.1 or 7.1 home theater playing film soundtracks, Source will look great in your entertainment space and provide years of performance and pride because of its renowned MartinLogan design and construction. Best of all is the low cost - the Source allows you to get the superior build quality and truly exceptional sound of more expensive electrostats for a very affordable price.

Preface Speaker - Compact and decor-friendly, the Preface is a perfect reflection of the passion and pride of MartinLogan products. Equipped with 3 6.5 inch woofers and an ATF high frequency driver, the Preface delivers a sound with unparalleled purity, precision and clarity. Frequency response ranges from 35-20,000 Hz.



Add A MartinLogan Center Channel or Surround (sold separately)

Motif Speaker - Motif is an amalgam of technologies carefully balanced to maximize performance and installation flexibility. A state-of-the-art XStat transducer, MicroPerf stators, ClearSpar spacers, and vacuum bonding combine with dual aluminum-cone woofers and a proprietary Vojtko crossover to provide maximize efficiency for an effortless, unlimited dynamic presentation. The result is rich, lifelike, stunningly detailed sound that blends seamlessly with our other electrostats and enhances any home theater.

Fully Powered Feature Speaker - Internally powered with a high-resolution 150 watt switching amplifier the Feature allows an unprecedented level of system connection flexibility. A standard RCA line-level input minimizes wire clutter by connecting directly to on-wall televisions (and other devices) without the need for external amplifiers. Additionally, standard speaker-level connections allow the fully powered Feature to integrate with audio systems where RCA connection is not possible.

Matinee Speaker - The MartinLogan Matinee electrostatic center channel speaker is highly compatible and complimentary with your home theater system. The MartinLogan Matinee is an evolved expression of the same ideas and engineering that spawned the Stage and Motif speakers. A state-of-the-art Generation 2 MicroPerf electrostatic panel, dual paper-cone woofers, and highly sophisticated Vojtko crossover technology deliver unrivaled precision and center-channel intelligibility. Carefully hand-built using only the finest components, Matinee's crossover preserves even the most subtle sonic nuances while handling the full dynamics of any source.

Fresco i Speaker - The Fresco i is a compact on-wall or off-wall speaker that can be used as either center, front or surround channels. The Fresco i comes standard with a low-profile, single-pivot wall brack that allows verticle or horizontal mounting. Table and floor stands are optional. Fresco i has two 4 " woofers as well as a mid-range and high frequency driver and plays from 75 to 20,000 Hz.

Vignette Speaker - The Vignette is an on-wall or off-wall speaker that can be used as either center, front or surround channels. The Vignette comes standard with both black and silver grill covers and a low-profile, single-pivot wall brack that allows verticle or horizontal mounting. Table and floor stands are optional. The Vignette has two 4 " woofers as well as a high frequency driver and plays from 78 to 20,000 Hz.

Encore TF Speaker - Designed to serve as a high performance center channel in home theater environments, the Encore TF delivers exceptional performance at a very affordable price. Sophisticated technologies such as ATF™ (Advanced Thin Film) tweeters and quality parts give this speaker lifelike clarity and openness approaching that of our electrostatic designs.The Encore TF is a highly adaptable speaker working well mounted on or off the wall in any application. It also performs well in front channel and surround channel applications.

Other MartinLogan Custom Install Solutions (sold separately)

Voyage In-Wall Speaker - The MartinLogan Voyage in-wall speaker system is a ultimate-performance speaker for your home theater entertainment room.. It is the world's most sophisticated and elegant architectural loudspeaker, The Voyage in-wall speaker sounds so clean and dynamic, you'd think it were a superb standalone design. Not surprising, since it borrows so much from our own, including Advanced Thin Film drivers and high-resolution woofers. A rigid aluminum chassis and die-cast mounting locks enhance performance and ease installation, while an adjustable tweeter-alignment sphere, paintable end caps, and a selection of grille colors provide incredible adaptability.

Passage In-Wall Speaker - A uniquely elegant and extremely accurate in-wall speaker, Passage is a remarkable performer delivering the sound quality you would expect to hear from one of MartinLogan's floorstanding loudspeakers. With twin high-resolution aluminum-cone woofers, a world class ATF (Advanced Thin Film) tweeter, an advanced-technology Vojtko crossover and a rigid aluminum chassis and 1" front baffle, Passage is quite simply an in-wall loudspeaker marvel. The result is a full, wonderfully smooth and engaging sound with clean and surprisingly deep bass foundation.

Ticket In-Wall Speaker - The MartinLogan Ticket in-wall speaker is a compact, affordable in-wall speaker for every room in your home. While significantly smaller than Passage, the elegant, affordable Ticket in-wall speaker is nonetheless a very strong performer. Its dual long-throw, high-resolution woofers, integrated dome tweeter, and advanced Vojtko¿ crossover deliver rich, clear sound and superb stereo imaging. Ticket also features paintable end caps and a selection of grille colors for perfect matching with any decor. Its quick and easy, yet very secure, installation system is the same used in Voyage and Passage speakers from MartinLogan.

Helos 100 In-Ceiling Speaker - Helos 100 is ideal for any room requiring ultimate in-ceiling audio performance such as a 2-channel system in a large living room or a multi-channel system in a discrete home theater. Helos 100's aimable assembly allows a large audience to experience the full potential of the Helos 100. Featuring a 1-inch neodymium soft dome tweeter, high-rigidity aluminum cone woofer, and proprietary Vojtko crossover topology, Helos 100 effortlessly provides solid imaging with extreme sonic accuracy. An acoustic contour switch tailors dispersion assuring a top-notch performance in any installation.

Helos 20 In-Ceiling Speaker - A direct descendant from the Helos100, the Helos 20 continues with the MartinLogan tradition of exceptional sound. The Helos 20 has the ability compliment any decor with it's paintable grill and frame. Sonically, the Helos 20 boasts a dual voice coil system with two 0.75 inch soft dome tweeters with a pivoting stem and a single 6.5 inch woofer, creating crisp accurate sound. Frequency response ranges from 47-20,000 Hz.

Helos 10 In-Ceiling Speaker - The Helos 10 delivers legendary MartinLogan quality and performance in a compact, high-resolution in-ceiling loudspeaker. Featuring a 1-inch neodymium soft dome tweeter mounted in an aimable stem, high-rigidity aluminum cone woofer, and proprietary Vojtko crossover topology, Helos 10 effortlessly provides extreme sonic accuracy.


Product Description

Depth i deploys the full array of MartinLogan's advanced subwoofer technologies to achieve deep, rich, satisfying bass while preserving electrostatic-like accuracy and detail. Its TriLinear BalancedForce alignment, advanced low-distortion switching amplifier, and sophisticated triple-servo control systems extract the very best possible performance from Depth i's high-resolution 8-inch aluminum-cone drivers. TriLinear BalancedForce places the subwoofer's three drivers precisely 120 degrees apart from each other in the cabinet. Their reaction force vectors meet at the center and exactly cancel, virtually eliminating cabinet resonance and vibration. Gone with them are the cabinet-radiation coloration and bass blur that afflict even the best conventional subwoofers. The triple-servo system, meanwhile, ensures that the output from the drivers themselves – the output we want – is always an absolutely faithful replica of the audio input signal. Depth i blends easily into any high-performance stereo music or multi-channel home theater system. In fact, with its easily accessible top-mounted controls and separately configurable LFE and two-channel inputs, Depth i's performance can be independently optimized for home-theater and stereo operation in the same system.

Customer Questions & Answers

Customer Reviews

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Most Helpful Customer Reviews

6 of 7 people found the following review helpful By Bjorn Borgenhard on February 4, 2011
Color Name: Dark Cherry
This is an amazing sub. I have it paired with my Acoustic Zen Adagio speakers and they complement each other perfect. The sub is fast, clean and handles down to 20 hz with ease. I use it mainly for music and the adjustment options on the sub are flexible enough that you should be able to blend it with just about any main speakers. It is a very musical sub, but also gives you that clean deep response needed for action movies. You truly will think you are part of the action. Just be considerate of your neighbors since it does pack a ferocious punch! I would not hesitate to recommend to anyone!
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3 of 3 people found the following review helpful By BigDogAxis on February 13, 2014
Color Name: Black Ash
This is a clean, clear, and powerful full range subwoofer. It's unique design somehow cancels all vibration, err I should clarify cabinet vibration. It has the power to shake you out of your seat. The frequency response has to be measured to believe it. This sub handles 20Hz with ease.

The downside, true do any speaker or sub, is the response curve. I am able to balance my two MartinLogan Depth subs by offsetting Phase at 0 for one and 270 for the other. I find the 25Hz knob affects volume more than the 20-30Hz frequency range which is disappointing.

Still, this subwoofer is well built and designed. MartinLogan must have put everything in the cabinet, including the kitchen sink, because it is heavy. You better get some help moving this bad boy around.
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9 of 12 people found the following review helpful By Dr. Stuart Gitlow TOP 1000 REVIEWERVINE VOICE on May 24, 2010
Color Name: Dark Cherry Verified Purchase
Partnering a subwoofer with a pair of Martin-Logan reQuests is a difficult venture. The reQuests already have significant low end response down to 30Hz. The problem becomes apparent upon using just the pair of speakers for 5.1 soundtracks or for audio sources that have music that can truly utilize the low end of the spectrum. For the 5.1 soundtracks, there's no easy way of getting the .1 output directly to the main pair without making a mess of the more essential qualities of the audio. The Depth i brings the response down to 20Hz without any difficulties. It can be wired simultaneously for both your digital .1 subwoofer output and for reproducing just the low end of the spectrum on 2 channel sources. To do that, you can run the patch cord for the digital .1 output directly to the appropriate input on the sub while also running a pair of cables for the RCA line level input. You may wish to ensure that your preamp can handle this easily or that you have the appropriate cables in advance.

The placement for the sub, which is a very nice looking and very heavy unit, is typically behind one of the front speakers. The sub's crossover frequency is easily adjusted as is its volume, so you can not only adjust it appropriately for your current speakers but can set it so that those in the family who don't appreciate bass are comfortable. This can be set up so that it makes your chair vibrate with the explosions or so that it adds a balanced extension of your system's overall frequency response down another few notches.

Setup was easy although you need two people to unpack and move the unit into position. You can leave the speaker switched on, in which case it goes into standby mode when no signal is being received, or can turn it on and off as desired. MartinLogan's customer service and online support has always been excellent. The manual is well written and straightforward.
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2 of 2 people found the following review helpful By James Spell on May 22, 2014
Color Name: Black Ash
I owned a ML Depth for a few years, and I just loved it. I did not get it from Amazon (I worked at an electronics company and there was a promo contest). We'd do this sales trick where we'd put sub test discs (everything single frequency tones and sweeps from 20Hz to 100hz, to Durty South rap that kills lesser subs) into it, and it could play everything with grace... with a nickel balanced on the top. Seriously, no vibration at all. It knocked everything we could throw at it out of the park and it did so cleanly and clearly. It took serious effort to get it to even start bottoming out, but even then there was no distortion, just a little bit of knocking. The Depth and it's bigger brother (the Descent) are expensive, but to say it's an audio investment is an understatement.

This put a lot of oomph into my movies, music, and video games, but I had to sell it to buy an engagement ring.

If I ever have the spare cash for one of these again, I'd totally get another one (or hell, two) without hesitation or regret.
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