Martin Logan Grotto 15 Subwoofer

Digital Signal Processing

Ultra High-Resolution 500MHz Vojtko DSP Engine with 64bit processing

Frequency Response

20-120 Hz ±3 dB (Anechoic via LFE input)

Low Frequency Transducer

Triple 15" (25.4cm) Hybrid Woofer System consisting of 1x high-excursion, aluminum cone in a cast aluminum basket with 2x aluminum cone passive radiators for enhanced low frequency output.

Cabinet

Sealed 1" thick MDF cabinet with dual center braces and reinforced MDF woofer baffles

Amplifier

MartinLogan Magnitude MT-2kW Amplifier: 2000W peak (1000W continuous)

Controls (Backplate)

Level: Interactive LED Backlit Knob, Min-Max
Tone Sweep: Sweep Start and Pause (with status light)
Power Mode: On, 12v Trigger, Auto
Wireless Audio Pairing Button (for included MartinLogan wireless transmitter)

Controls (via Bluetooth)

Level: -40 to 12dB (Min-Max)
Low-Pass Filter (Frequency): 35–120Hz (1° Increments)
Low-Pass Filter (Order): Bypass, Third, Fourth
Phase: 0–180° (1° Increments)
Phase (Polarity): Normal, Inverted
Preset Listening Modes: Movie, Music, Night
20–30Hz Level: ±10dB
Anthem Room Correction (ARC Genesis): On, Off
Tone Sweep (120-20Hz): On, Off, Pause (Frequency)

Wireless Inputs

Integrated Wireless Receiver, Wireless Transmitter Included

Inputs

Line Level: Left, Right, and LFEXLR: LFE
Speaker Level: Left and Right (requires banana plugs)

Outputs

RCA Sub Out (combines and repeats all incoming signals to an additional subwoofer)

Power Draw

Max: 1000W
Standby (Wireless Disabled): 0.5W
Standby (Wireless Enabled): <2W
*Transmitter and Subwoofer combined

Feet

Integrated Anti-Vibration Feet (carpet spikes included)

Weight

118 lbs
(53.5 kg)

Dimensions (H x W x D)

20.5" x 21.8" x 21.8"
(52.2cm x 55.4cm x 55.4cm)

Finish

Gloss Black