In the endless race for the lower octaves, Martin Logan is back with serious bass firepower. The audio pioneer has unveiled its all-new one Cave 12 And Cave 15 subwoofers, featuring the company’s largest and most powerful hybrid woofer systems to date. Following the August 2024 launch of the Dynamo Foundation, Dynamo and Abyss Series, the Grotto 12 and 15 deliver extreme output and refinement for larger rooms.
“Subwoofers have been an important category for us at MartinLogan for over 20 years. As the latest addition to our new subwoofer series, we couldn’t be more excited to see the namesake Grotto return with such fanfare,” said Allan Tarrant, Senior Vice President by Martin Logan. “After the release of our new Dynamo Foundation, Dynamo and Abyss models, people kept asking us for bigger, even more powerful subwoofers. Consider the veil of secrecy lifted!”
MartinLogan Subwoofer Evolution: from descent to Grotto series
MartinLogan has built its reputation on electrostatic speakers, and for good reason: these panels are state-of-the-art when it comes to openness, transparency and speed. Detail and sky? Unparalleled. But when it comes to a thumping impact to the chest, the panels just don’t move enough air. Ever since the Monolith electrostatics debuted in 1983, dealers have heard the same question: “What can I combine with these things to get real low end?” In 2001, MartinLogan finally had an answer with the Descent series subwoofers.
From there they’ve steadily honed their low-frequency playing, adding depth, texture and features with each generation. The most recent update came last year with the aforementioned three new subwoofer lines.
Martin Logans Abyss series delivers compact, powerful bass thanks to its hybrid woofer system: an active aluminum woofer combined with two passive radiators for tight, powerful performance. The Abyss 8 ($1,399.99 USD) uses a 500W RMS / 1,000W peak Magnitude MT-1 kW amplifier, while the Abyss 10 ($1,899.99 USD) steps up to 800W RMS / 1,600W peak with the MT-1.6 kW amplifier.
The new Grotto 12 and 15 subwoofers sit above the Abyss models in MartinLogan’s lineup and offer larger hybrid woofers and up to 2 kW of peak power for even more output and room-hugging bass, making them the best choice for larger rooms or listeners looking for maximum impact.
The middle level is the Dynamo seriesavailable in sizes 8, 10 and 12 inches. Like the Abyss, it comes with modern conveniences: wireless capabilities, room correction, and an app that doesn’t look like it was coded in 1997.
At the entry level is the Dynamo Foundation Series offers the same drivers, but orients them downward, ditches the wireless frills and keeps everything wired-only to achieve a more approachable price point – without veering into boombox territory.
MartinLogan Grotto 12 & 15 subwoofers: triple hybrid woofers with 2 kW amplification
The Grotto models are MartinLogan’s new flagship subwoofers, offering powerful, space-saving performance at a more accessible price point. The Grotto 12 comes in at $2,299.99 USD, while the larger Grotto 15 goes up to $2,799.99 USD.
“The original Grotto was the first MartinLogan product I ever owned, and it is still used to this day. I’m thrilled to have been part of releasing its successors,” said Andrew Lindsey, Product manager and MartinLogan. “The new Grotto 12 and Grotto 15 continue the legacy of the original, delivering massive output capabilities and incredible refinement – all in a subtle, stylish design that can take even larger rooms under pressure.”
Key features and benefits of the Grotto series
The MartinLogan Grotto 12 and 15 are not for playing; they’re built to move serious air. Both models use a hybrid woofer system, combining an active aluminum woofer with double passive aluminum radiators. The result? The punch and output of a ported subwoofer, but with the tight, controlled bass you expect from a sealed design.
Under the hood, the Magnitude MT-2kW amplifier delivers 2,000W peak power (1,000W RMS), giving these subs enough headroom to crush the largest rooms without sounding strained. Every nuance of your music is preserved thanks to a 500 MHz, 64-bit DSP engine that handles all the advanced processing.
The cabinets are built like tanks: 1 inch MDF with reinforced baffles and center brackets, so your bass hits hard without the cabinet bending or discolouring. Anti-vibration feet keep your neighbors (and your floorboards) from complaining, while integrated wireless connectivity ensures a clean installation with virtually no latency.
Installation and operation are a piece of cake. RCA, XLR, speaker inputs and sub outputs give you maximum flexibility, and the MartinLogan Subwoofer Control app lets you adjust settings from your seat. Grotto subs also support Anthem Room Correction (ARC), so you can set room-specific EQ and get the most out of your walls and your patience.
Cave 12 Specifications
- Application: Subwoofer
- Frequency Response: 22–120 Hz ±3 dB (echoic via LFE input)
- Low frequency transducer: Triple 12″ hybrid woofer system (1x high-excursion aluminum active woofer + 2x aluminum passive radiators)
- Amplifier: Magnitude MT-2kW Class-D; 1,000 W RMS / 2,000 W peak
- Digital signal processing: 500MHz Vojtko DSP engine with 64-bit processing
- Little cupboard: Sealed 1″ MDF with center bracket and reinforced woofer baffles
- Controls (back plate): Level (Interactive LED Button), Tone Sweep, Power Mode (On, 12v Trigger, Auto), Wireless Pairing
- Control (app/Bluetooth): Level (-40 to +12 dB), low-pass filter (35–120 Hz, 1° increments), phase (0–180°, polarity normal/reverse), preset listening modes (movie, music, night), tone movement (20–120 Hz), anthem room correction on/off
- Inputs: RCA left/right, LFE XLR, speaker level left/right
- Outputs: RCA Sub output
- Wireless: Integrated receiver; Transmitter included
- Power consumption: Maximum 1,000 W; Standby wireless enabled <2W; Standby Wireless disabled 0.5 W
- Feet: Integrated anti-vibration feet (including carpet spikes)
- Weight: 82.5 pounds (37.4 kg)
- Dimensions (HxWxD): 17.8″ x 17.9″ x 17.9″ (45.2 x 45.4 x 45.4 cm)
- Finish: Glossy black
Cave 15 Specifications
- Application: Subwoofer
- Frequency response: 20–120 Hz ±3 dB (echoic via LFE input)
- Low frequency transducer: Triple 15″ hybrid woofer system (1x high-excursion aluminum active woofer + 2x aluminum passive radiators)
- Amplifier: Magnitude MT-2kW Class-D; 1,000 W RMS / 2,000 W peak
- Digital signal processing: 500MHz Vojtko DSP engine with 64-bit processing
- Little cupboard: Sealed 1″ MDF with dual center brackets and reinforced woofer baffles
- Controls (back plate): Level (Interactive LED Button), Tone Sweep, Power Mode (On, 12v Trigger, Auto), Wireless Pairing
- Control (app/Bluetooth): Level (-40 to +12 dB), low-pass filter (35–120 Hz, 1° increments), phase (0–180°, polarity normal/reverse), preset listening modes (movie, music, night), tone movement (20–120 Hz), anthem room correction on/off
- Inputs: RCA left/right, LFE XLR, speaker level left/right
- Outputs: RCA Sub output
- Wireless: Integrated receiver; Transmitter included
- Power consumption: Maximum 1,000 W; Standby wireless enabled <2W; Standby Wireless disabled 0.5 W
- Feet: Integrated anti-vibration feet (including carpet spikes)
- Weight: 118 pounds (53.5 kg)
- Dimensions (HxWxD): 20.5″ x 21.8″ x 21.8″ (52.2 x 55.4 x 55.4 cm)
- Finish: Glossy black
The bottom line
MartinLogan’s Grotto 12 and 15 subwoofers redefine bass performance with their advanced hybrid woofer systems, integrating high-excursion aluminum woofers with dual aluminum passive radiators. This design delivers the output of a ported subwoofer, with the tight bass of a sealed enclosure.
Powered by the Magnitude MT-2kW amplifier, these models deliver peak power up to 2000W, delivering deep, distortion-free bass. The 500MHz Vojtko DSP engine provides precise tuning and integration with the Anthem Room Correction system, while the reinforced MDF cabinets and vibration-dampening feet improve performance and reduce unwanted resonance.
However, the subwoofer market is becoming increasingly competitive. The SVS SB-5000 R|Evolution stands out with its formidable 15-inch driver and dual monoblock amplifier delivering 5000W peak power, complemented by a 295MHz DSP for precise control.
Additionally, REL’s Series S series introduces faster, lighter drivers and amplifiers derived from their reference models, aiming to deliver more nuanced and better integrated bass. DALI’s SUB V-16 F features a 16-inch driver and 1500W RMS amplification, designed for deep bass extension and precision. Meanwhile, Raidho’s TD8 and TD10 subwoofers feature diamond-coated drivers and ultra-low latency amplification, aimed at high-end audiophile markets.
In this competitive landscape, the Grotto 12 and 15 subwoofers stand out with their unique combination of power, precision and innovative design, providing audiophiles with a compelling choice to take their audio experience to the next level.
For more information: martinlogan.com
Where to buy:
- Cave 12: Glossy Black
- $2,299.99 | $2,599.99 CAD
- Cave 15: Glossy Black
- $2,799.99 | $3,199.99 CAD
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