MartinLogan - Depth 215, Dual 15” 4.4kW Powered Subwoofer, with BalancedForce Technology, Sub Control App, and Wireless Built-In - Gloss Black

The Depth Series is the culmination of MartinLogan’s decades of experience in designing high-performance subwoofers. Depth subwoofers are meticulously engineered to deliver powerful bass as cleanly as possible, making them an ideal choice for both dedicated 2-channel systems, home theater setups, or anything in between. Depth Series subwoofers are designed to blend uncompromising low-frequency performance with timeless, luxury design. Starting with a massively overbuilt cabinet, expertly sculpted to achieve a sleek and elegant look, every aspect of the Depth Series has been carefully crafted into a perfect fusion of form and function. The force-canceling dual-woofer layout virtually eliminates performance-robbing cabinet resonances, allowing the custom 12" (Depth 212) or 15" (Depth 215) Carbon Aerocore woofers to deliver pure bass energy without coloration. The system is powered by high-output, ultra-precise amplification managed by a class-leading 64-bit Vojtko DSP engine, enabling massive dynamic output, low distortion, and exceptional musicality. It’s not only about what you can see and hear, though—it’s also about what you can’t. For example, the amplifier is fully integrated into the sleek rear panel of the cabinet. Not only does this maintain a clean aesthetic, but it also allowed our engineers to design a convection cooling system to ensure optimal performance. The aluminum trim pieces along the rear edges serve not only as visual accents, but also as functional heatsinks and air intakes for the cooling system. Depth subwoofers prove that high performance and high style do not have to be mutually exclusive.

• The MartinLogan Sound: MartinLogan subwoofers are uniquely engineered to keep pace with the exotic thin film technologies utilized in MartinLogan loudspeakers. With a focus on high performance and decor friendly design, MartinLogan subwoofers expertly blend audiophile musicality, theatrics, and precision with powerful output, all into a compact space.
• Luxury Performance, Timeless Design: Depth Series subwoofers unite powerful, low-distortion bass with refined, modern design. A sculpted, overbuilt cabinet houses a hidden amplifier cooled through integrated aluminum trim that doubles as functional heatsinks and air intakes. The result is a clean, elegant aesthetic with high-end performance—proof that style and sound can coexist without compromise.
• BalancedForce Woofer System: Depth 215 uses dual opposed 15-inch woofers operating in equal and opposite motion to cancel cabinet vibration. This eliminates resonance and distortion, delivering cleaner, more articulate bass. The result is deeper, more natural low-frequency performance with greater authority, pairing effortlessly with high-resolution loudspeakers.
• Carbon Aerocore Woofers: Depth’s Carbon Aerocore woofers use a tri-layer cone of carbon fiber, PMI foam, and fiberglass for exceptional strength, damping, and low weight. This design delivers precise, controlled bass with outstanding clarity. Triple venting and dual copper shorting rings further enhance cooling and reduce distortion, ensuring powerful yet highly articulate performance.
• Reference Grade Amplification: Depth 215 features a 4.4kW Dynamic Peak (2.2kW RMS) Class-D amplifier. Don't make assumptions based on power, Depth subwoofers are not only about playing loud. This massive power reserve not only allow Depth 215 to achieve high-output with low distortion, but also the precise delivery of bass, exactly when you need it, regardless of the volume level. Power and precision delivered with elegance, this is the MartinLogan way.
• 64-bit Vojtko DSP Engine: Depth subwoofers use our ultra-high-resolution 64-bit Vojtko DSP engine to control every aspect of performance in real time. This powerful 500MHz processor enables wireless app control, wireless audio connection, and advanced tuning with complete transparency. It also provides full compatibility with Anthem Room Correction for optimized, room-tailored bass.
• Convection-Cooled Concealed Amplifier: Depth features a fully concealed amplifier design that keeps every side of the subwoofer looking refined. Extruded aluminum trim pieces act as convection-cooling heatsinks, drawing in cool air and releasing heat for optimal performance. Inputs are tucked neatly along the lower rear edge, keeping cables low and clean for an elegant, clutter-free appearance.
• Concealed Touch Control Interface: Depth subwoofers include a hidden Touch Control Interface behind the front logo panel. The backlit MartinLogan “zig” can be customized or turned off for a stealth look. Press beneath the logo to remove the panel and access the LED display with six context-sensitive touch controls—allowing full adjustment directly on the sub without using the app.
• Built-In Wireless Connection: Although correct placement plays a key role in optimizing subwoofer performance, getting a cable where you need it can be challenging. To solve the problem, Depth subwoofers incorporate a built-in Wireless Receiver for use with the included Wireless Subwoofer Transmitter. With quick and easy setup, eliminating cable clutter has never been easier and with lossless transmission and low latency, even the most discerning enthusiast will be thrilled with the results.
• Solid Structure: Depth’s cabinet is engineered for maximum rigidity and low resonance, with variable wall thickness from 1" to 3", reinforced woofer baffles, and a central internal brace. Though some might call it overbuilt, this structure ensures strength, stability, and clean, accurate bass performance worthy of a flagship subwoofer.
• Robust Connectivity: Depth subwoofers offer versatile wiring options alongside built-in wireless. Use XLR for stereo or LFE, or RCA for stereo, LFE, and sub chaining via RCA Sub Out. Speaker-level inputs via banana plugs ensure compatibility with a wide range of amplifiers, including balanced designs. All inputs may be used simultaneously if desired.
• Less Vibration, More Detail: Depth subwoofers use a rigid cabinet, BalancedForce woofer alignment, and integrated anti-vibration feet to greatly reduce cabinet and floor vibration. This minimizes room rattles and coloration, delivering tighter, cleaner bass and improved clarity. The feet are safe for all flooring, with optional carpet spikes included for further performance enhancement.
• Anthem Room Correction (ARC®): One of the biggest factors in sound quality is the room in which a speaker or subwoofer is placed. To ensure optimal results in your environment, Depth subwoofers support the award-winning ARC® Genesis Room Correction system for precise room equalization, tuning, and calibration, ensuring maximum bass impact and flawless integration. A premium calibration microphone kit and stand is included.
• The MartinLogan Sound: MartinLogan subwoofers are uniquely engineered to keep pace with the exotic thin film technologies utilized in MartinLogan loudspeakers. With a focus on high performance and decor friendly design, MartinLogan subwoofers expertly blend audiophile musicality, theatrics, and precision with powerful output, all into a compact space.
• Luxury Performance, Timeless Design: Depth Series subwoofers unite powerful, low-distortion bass with refined, modern design. A sculpted, overbuilt cabinet houses a hidden amplifier cooled through integrated aluminum trim that doubles as functional heatsinks and air intakes. The result is a clean, elegant aesthetic with high-end performance—proof that style and sound can coexist without compromise.
• BalancedForce Woofer System: Depth 215 uses dual opposed 15-inch woofers operating in equal and opposite motion to cancel cabinet vibration. This eliminates resonance and distortion, delivering cleaner, more articulate bass. The result is deeper, more natural low-frequency performance with greater authority, pairing effortlessly with high-resolution loudspeakers.
• Carbon Aerocore Woofers: Depth’s Carbon Aerocore woofers use a tri-layer cone of carbon fiber, PMI foam, and fiberglass for exceptional strength, damping, and low weight. This design delivers precise, controlled bass with outstanding clarity. Triple venting and dual copper shorting rings further enhance cooling and reduce distortion, ensuring powerful yet highly articulate performance.
• Reference Grade Amplification: Depth 215 features a 4.4kW Dynamic Peak (2.2kW RMS) Class-D amplifier. Don't make assumptions based on power, Depth subwoofers are not only about playing loud. This massive power reserve not only allow Depth 215 to achieve high-output with low distortion, but also the precise delivery of bass, exactly when you need it, regardless of the volume level. Power and precision delivered with elegance, this is the MartinLogan way.
• 64-bit Vojtko DSP Engine: Depth subwoofers use our ultra-high-resolution 64-bit Vojtko DSP engine to control every aspect of performance in real time. This powerful 500MHz processor enables wireless app control, wireless audio connection, and advanced tuning with complete transparency. It also provides full compatibility with Anthem Room Correction for optimized, room-tailored bass.
• Convection-Cooled Concealed Amplifier: Depth features a fully concealed amplifier design that keeps every side of the subwoofer looking refined. Extruded aluminum trim pieces act as convection-cooling heatsinks, drawing in cool air and releasing heat for optimal performance. Inputs are tucked neatly along the lower rear edge, keeping cables low and clean for an elegant, clutter-free appearance.
• Concealed Touch Control Interface: Depth subwoofers include a hidden Touch Control Interface behind the front logo panel. The backlit MartinLogan “zig” can be customized or turned off for a stealth look. Press beneath the logo to remove the panel and access the LED display with six context-sensitive touch controls—allowing full adjustment directly on the sub without using the app.
• Built-In Wireless Connection: Although correct placement plays a key role in optimizing subwoofer performance, getting a cable where you need it can be challenging. To solve the problem, Depth subwoofers incorporate a built-in Wireless Receiver for use with the included Wireless Subwoofer Transmitter. With quick and easy setup, eliminating cable clutter has never been easier and with lossless transmission and low latency, even the most discerning enthusiast will be thrilled with the results.
• Solid Structure: Depth’s cabinet is engineered for maximum rigidity and low resonance, with variable wall thickness from 1" to 3", reinforced woofer baffles, and a central internal brace. Though some might call it overbuilt, this structure ensures strength, stability, and clean, accurate bass performance worthy of a flagship subwoofer.
• Robust Connectivity: Depth subwoofers offer versatile wiring options alongside built-in wireless. Use XLR for stereo or LFE, or RCA for stereo, LFE, and sub chaining via RCA Sub Out. Speaker-level inputs via banana plugs ensure compatibility with a wide range of amplifiers, including balanced designs. All inputs may be used simultaneously if desired.
• Less Vibration, More Detail: Depth subwoofers use a rigid cabinet, BalancedForce woofer alignment, and integrated anti-vibration feet to greatly reduce cabinet and floor vibration. This minimizes room rattles and coloration, delivering tighter, cleaner bass and improved clarity. The feet are safe for all flooring, with optional carpet spikes included for further performance enhancement.
• Anthem Room Correction (ARC®): One of the biggest factors in sound quality is the room in which a speaker or subwoofer is placed. To ensure optimal results in your environment, Depth subwoofers support the award-winning ARC® Genesis Room Correction system for precise room equalization, tuning, and calibration, ensuring maximum bass impact and flawless integration. A premium calibration microphone kit and stand is included.