Jonathan's Site

Audio / Video / Cars / Gadgets

MartinLogan - Monolith III

It all began with this reference speaker project. Since its emergence in 1982, the Monolith has represented the culmination of reference level ML electrostatic technology and exhaustive crossover and dynamic driver research, providing dynamics, precision and bandwidth comparable at any price range.

This system combines lush wood grain and black satin composite finishes into a strikingly beautiful cabinet, as elegant to behold as its sound reproduction is to experience.

While the original Monolith III's were impressive, this set is now totally customized:

These units now run full active crossovers provided by DBX DriveRack 4800 speaker processors.
In 2006, the ESL Panels were also replaced with factory fresh units, and they also feature updated woofers, using Peerless 830669 drivers. 

The updated woofers allow the unit to have much better mid-bass integration and since the driver does not need to cover ultra-low frequencies, it performs much better in the critical mid-bass region.

Performance is now outstanding, so much so, I'm not tempted by newer models. Well, maybe a pair of CLX's would ;-)

The system specifications are:

  • System Frequency Response
    28-24,000 Hz +/-3dB
  • Electrostatic Frequency Response
    (Original) 100-24,000 Hz +/- 2dB
    (Current) 315 - 24,000 Hz +/- 2dB
  • Woofer Frequency Response
    (Orginal) 28-2,000Hz +/- 2dB
    (Current) 60 - 315Hz +/- 1db
    Original woofer replaced see details of upgrade here.
  • Crossover Frequency
    Factory passive unit: 125 Hz at 12 dB per octave (not used anymore)
    Active crossover set to 315 Hz at 24 dB per octave between panel and woofer
    and at 60 Hz 24 dB per octave between woofer and subwoofer
  • Dispersion
    Horizontal: 30 degrees
    Vertical: 4' Line Source
  • Sensitivity
    90dB/1 watt/meter
  • Power handling
    250 watts per channel
  • Recommended Amplifier Power
    100 - 400 watts per channel
  • Jonathan's recommended amplifier
    Sunfire Amplifier
    • Panels - 800w
    • Woofers - 300w
  • Impedance
    nominal 4 ohms; minimum 1.2 ohms
  • Weight
    125 lbs/each (132 lbs/each with new woofer)
  • Dimensions:
    26.5" W x 11.5" D x 74" H



Martin Logan Monolith III

ML Logo