MartinLogan's New Grotto™ i Ultimate Performance Subwoofer


Available: Now Shipping

US Retail Price: $1,295/each

Lawrence, Kansas, July 2007 - MartinLogan, the Loudspeaker Technology Company, has released the new Grotto i ultimate performance subwoofer. Dramatic bass detail and attack are delivered via Grotto i's advanced servo monitoring and control system, low -mass aluminum element driver, low distortion amp, and highly evolved enclosure technology.

Features Include:
• Simultaneous LFE and 2 -Channel Connection
• Rigid, Low -Mass 10 -Inch Aluminum Element Woofer
• Servo Monitoring and Control
• Sealed Cabinet Enclosure
• 25Hz Level Control
• 300 Watt / 900 Watt Peak Digital Amplifier
• Precision Low -Pass Filters

From a low -distortion 300 watt (900 watt peak) switching amplifier Grotto i delivers extremely articulate bass. MartinLogan's unique high -performance topology eliminates the need for exaggerated amplifier power ratings, transient -blurring ported or passive radiator enclosures common to so many subwoofers. A proprietary servo monitoring and control system ensures that the woofer output is dramatically free of distortion, resulting in a faithful replica of the audio input signal.

A robust connection and control system allows simultaneous connection of both 2 -channel stereo music and multi -channel home theater -and allows each source to have individual crossover and level settings. LFE input effectively uses no low -pass filter, leaving crossover control to the processor. Left/right line level and speaker level inputs integrate six discrete audiophile grade low -pass filters between 30 -80Hz allowing a different level and crossover point when playing back two channel music.

RCA output allows multiple Grotto i's to operate in serial. A unique 25Hz level control allows adjustment of system response by ±10dB to eliminate low -frequency build -up or suck -out at problematic bass frequencies common to most rooms. Proprietary ETC™ spikes couple the sub directly to the floor, minimizing lost energy and allowing tight, well defined bass.

Grotto i is available at MartinLogan ESL Series dealers including independent retailers and mass -market retailers such as Tweeter.


Frequency Response
22 -120 Hz ± 3 dB. Anechoic through the LFE effects input.

Low -Pass Filter Frequencies
30, 35, 45, 55, 65, 80Hz

High -Pass Filter Frequencies

0°, 90°, 180°, 270°

25Hz Level

On, Auto, Standby

10" (25.4cm) high -excursion, aluminum cone with extended throw driver assembly, sealed non -resonant asymmetrical chamber format

300W (at < 0.5% THD)
900W (peak)

Left/Right RCA Line Level, RCA LFE, Speaker Level

RCA Sub Out (all inputs summed), RCA Left/Right (with High Pass Filter)

Input Impedance
20,000 Ohms

Power Draw
Max: 250 Watts; Idle: 15 Watts; Standby: 10 Watts

51 lbs. each (23.2 kg)

18.6" H x 15.2" W x 13.8" D (47.3 H x 38.6 W x 35 D cm)

MartinLogan, one of the most respected names in audio, is located in Lawrence, Kansas, where 80 employees handcraft the company's ultimate loudspeaker products. The speaker systems, incorporating MartinLogan's patented CLS™ (Curvilinear Line Source) high -resolution electrostatic technology and ATF™ (Advanced Thin Film) transducers, range in price from $399 to over $10,995 (US Retail). The subwoofer systems range in price from $599 to $2,995 (US Retail).


For more information regarding MartinLogan visit, or contact Devin Zell at (785) 749 -0133 or email Devin at

Featured Product

Light sockets; Not just for lights anymore

Light sockets; Not just for lights anymore

Smart Bulbs are out there and they can do far more then just provide light. Speakers, projectors, wi-fi extenders and more. The standard light socket that is wired up and ready to go in nearly every home in North America is now providing an easy and affordable option for home owners and renters alike to enter into the world of the "Smart Home". Here is a look at some of the Smart Bulbs and Smart Lighting options out there, and this list is just the beginning. In this ongoing article we hope to continue to add to and grow this list, so stay tuned!