Grotto 15 vs Legacy Audio Metro XD
The Metro XD's power @ 8ω is 750W against the Grotto 15's 1.0kW, its high-frequency extension 150 Hz against 120 Hz, and its woofer 12" against 15". Both share low-frequency extension (20 Hz).
AI-generated product photo — not official manufacturer imagery.
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Estimated price (community-sourced)
$2,800
Around — community and catalog average, updates slowly
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.
Specifications
Transducer Specifications
Driver and acoustic performance characteristics
- Frequency Response
- 20 Hz - 120 Hz
- Power Handling
- 1.0kW
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 1.0kW @ 8Ω
Speaker Design
Driver configuration and enclosure design
- Driver Type
- Hybrid Woofer System
- Driver Size
- 15"
- Driver Count
- 3
- Enclosure Type
- sealed
Connectivity
Input and output connections
- Digital Inputs
- XLR, RCA, Speaker Level
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 554 × 521 × 554 mm (W × H × D)
- Weight
- 53.5 kg (118 lbs)
Key Specifications
Power: 1000W
Frequency: 20-120 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions