Product Description
The MartinLogan Grotto 15 brings serious, room-filling bass in a cube-shaped cabinet that blends into the room. Three full-face grilles hide its 15-inch Hybrid Woofer System: one powered aluminum woofer working with two matching 15-inch passive radiators. You get the deep extension of a ported design with the tighter, more controlled bass and smaller size of a sealed one. The largest and most powerful Hybrid Woofer System MartinLogan has built, reaching down to 20 Hz.
15″ Hybrid Woofer System
All three drivers use aluminum cones in rigid cast aluminum baskets, tuned with Klippel analysis for high output and low distortion. Aluminum is light, stiff and sheds heat well, so the woofer stays quick and reliable even when pushed hard.
Magnitude MT-2kW Amplifier
A Class-D Magnitude MT-2kW amplifier delivers up to 2,000W peak (1,000W continuous), giving Grotto 15 plenty of clean power for big movie effects and effortless music playback.
500MHz Vojtko DSP Engine and ARC Genesis
A 64-bit, 500MHz Vojtko DSP engine controls the subwoofer in real time and enables app control, wireless connection and Anthem Room Correction. With the optional ARC Calibration Kit, ARC Genesis measures your room and tunes the subwoofer in a few minutes for smoother, more accurate bass.
Built to Stay Quiet and Solid
The sealed cabinet is made of 1-inch MDF with a reinforced woofer baffle and internal bracing. Integrated anti-vibration feet cut down rattles and the bass that travels into other rooms; carpet spikes are included.
Connect It Your Way
Inputs include RCA left/right and LFE, XLR LFE and speaker-level (banana plugs), plus an RCA sub output for adding another subwoofer. A wireless receiver is built in and the transmitter is included, so you can place Grotto 15 where it sounds best. The MartinLogan Subwoofer Control App lets you adjust level, crossover, phase and listening modes (Movie, Music, Night) from your seat.
