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About the Grotto 15
The MartinLogan Grotto 15 subwoofer delivers maximum performance in a compact, minimalist design. It features the largest Hybrid Woofer System with a high-excursion 15-inch aluminum cone active woofer paired with two 15-inch aluminum cone passive radiators for enhanced low-frequency output and low distortion. Powered by a MartinLogan Magnitude MT-2kW amplifier providing 2000W peak (1000W RMS) power, and an ultra-high-resolution 500MHz Vojtko DSP Engine with 64-bit processing. Supports ARC Genesis room correction, MartinLogan Subwoofer Control App, and multiple connectivity options including XLR, RCA, speaker level, and built-in wireless. Note: The product has been officially discontinued, with a successor 'Grotto i' expected soon.
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