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Unconditional Satisfaction GuaranteeNo Shipping Fees Above 302 Months to Decide. Returns Simplified.The original Grotto subwoofer used trickle downtechnology from MartinLogans flagship subwoofers todeliver clean, powerful, and articulate bass in a decorfriendly design. The all new Grotto series carries on thatlegacy and takes it to the next level. Its subtle appearance
belies the raw performance concealed beneath its grilles.
Grotto series subwoofers offer a unique combination of understated, minimalist styling and impressively powerful, yet articulate performance. Utilizing our largest, and most powerfulHybrid Woofer Systems to date, Grotto 12 and Grotto 15 pack an incredible feature list andmassive power into a classy, room friendly design, making them an ideal choice for thoselooking for a high performance, high output subwoofer that wont look out of place.
The Hybrid Woofer System used in the Grotto series, pairs either a 12″ or 15″ active aluminum woofer with two equally sized, custom-designed aluminum passive radiators. This driver layout provides the massive surface area necessary to achieve the increased output and lower distortion of a ported design while maintaining the more compact sizing and tighter bass typically associated with a sealed design.
Powering the Hybrid Woofer System is the brawn of MartinLogans powerful Magnitude
MT-2kW amplifier, capable of delivering up to 2000 watts of peak power (1000W RMS),
and the brains of the Ultra High Resolution Vojtko DSP Engine, a best-in-class 500MHz DSPwith 64bit processing. With their high output, low distortion Hybrid Woofer Systems paired withpowerful and precise amplification and processing, Grotto series subwoofers have the idealrecipe for highly detailed and powerful bass performance even in larger rooms.
Hybrid Woofer System The Ultimate Compact Powerhouse
Utilizing state-of-the-art Klippel analysis, all Grotto Series drivers are specially engineered for massive outputcapability and low distortion. Grotto 12 and Grotto 15 use our largest, most powerful Hybrid Woofer Systems,pairing either dual 12″ or dual 15″ passive radiators with a matching 12″ or 15″ active woofer. This driver layoutdelivers the best of both worlds; the increased output and lower distortion of a ported design, and the morecompact sizing and tighter bass that sealed designs are known for. To ensure quick response, high output, andsolid reliability, the active woofer is made of aluminum, known for its light weight, high strength, and excellent heatdissipation, all ideal qualities for such a high power application. Our design team did not want to skimp on thequality of the passive radiators either. So even though they do not receive direct power, they too are made ofaluminum to properly blend both acoustically and visually with the active driver.
Magnitude MT-2kW Amplifiers Redefine Grotto Performance
MartinLogans proprietary Magnitude Amplifiers unleash the full potential of the custom engineered Grotto woofers.The highly advanced Magnitude MT-2kW delivers up to 2000w Peak (1000w RMS) of low distortion powerfor concussive impact, and effortless musicality. This ultra efficient Class-D amplifier delivers massive power withincredible precision and control, driving Grotto 12 or Grotto 15 with nearly endless reserves of clean power evenduring the most demanding situations.
Advanced Vojtko DSP Engine: Elevating Subwoofer Performance
Just like their smaller siblings in the Abyss and Dynamo series, Grotto 12 and Grotto 15 subwoofers utilize thecutting-edge, ultra-high-resolution Vojtko DSP engine, named after MartinLogans Chief Audio Technologist.Featuring a best-in-class 500MHz DSP with 64-bit processing, the Vojtko DSP engine controls all aspects ofsubwoofer performance in real-time. This level of computing power enables advanced features like wirelessapp control, integrated wireless signal connection, and other advanced DSP functions with complete audibletransparency, allowing MartinLogan engineers to fine-tune performance for maximum output and fidelity. Thanksto the computational power of this sophisticated DSP engine, Grotto subwoofers are also compatible with theaward-winning Anthem Room Correction system.
Reduced Vibration, Enhanced Bass
Solid bass performance is a critical component of any audio system, and helps provide visceral impact toyour entertainment. Both Grotto models feature integrated anti-vibration feet to improve bass performance byreducing floor and wall vibrations. By dramatically reducing the energy transfer between the subwoofer andthe floor, unwanted room rattles and buzzes are removed, leaving tighter, cleaner bass and improved system
clarity and dynamics. As a less intrusive alternative to acoustic room treatments, the integrated anti-vibration feetcan also aid in minimizing noise complaints by reducing vibration transfer into adjoining rooms. Out of the box,these robust anti-vibration feet are safe for all flooring types, and optional carpet spikes are included to further
improve performance on carpeted floors.
Fine-Tune Your Subwoofer Settings with MartinLogan’s Intuitive App
By far the most convenient way to adjust a subwoofer, MartinLogans Subwoofer Control app for iOS andAndroid devices allows you to easily adjust settings such as Volume, DSP Mode, Phase, and many others rightfrom the comfort of your seat for ultimate control and ease of tuning.
Optimize Bass Performance with Award-Winning Anthem Room Correction
Grotto subwoofers are compatible with the award-winning Anthem Room Correction system. This highlyadvanced software measures subwoofer performance in your room and then performs custom equalization,tuning, and calibration to achieve the highest levels of bass impact and accuracy possible for your specificinstallation. Requires an ARC Calibration Microphone and a PC or Mac computer (sold separately).
