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Product code USD0126
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Martin Logan's Depth is an anomalous sub woofer in many aspects
the setting (small diameter extra-long stroke woofer) is that of the classic sub for audio video systems, but the number of woofers (three!) and above all the resulting sound take it light years away from this category.

Let's start with sound. Normally the a / v sub woofers are designed to reproduce the dinosaur steps or the explosion of a bomb, for these effects the timbric correctness matters little but it is important the impact and the "vibration" that one succeeds in obtain.

ML Depth is far from this objective, what is found in this unit is: speed and dynamics.

The project was created to complete the CLS of the same brand, the next version was updated in a few details to better match the CLX with the difficult task of obtaining the reaction speed of the large electrostatic panels.

Ultimately a few times I have found a SW capable of keeping up with a high level electrostatic speaker, I think of Janis or some Audio Pro models

now I can add Depth to my personal ranking.

Beware, however, the cut (in my opinion) must not exceed 50 Hz. Below this frequency with a reasonable figure, considering that it includes an amplification of 300 watts, we will obtain a realistic organ pedal to complete our electrostatic loved ones. Aesthetically it is in excellent condition, some slight scratches and a crack in the internal support of the front grille visible only by removing the frame



Specifications are subject to change without notice


Frequency Response

20–120 Hz ±3dB; Anechoic through LFE effects input


Line level RCA: 20,000 Ohms Compatible with 4, 6, or 8 Ohm rated amplifiers.

Low Frequency Transducer

Three 8" (20.3cm) high excursion, aluminum cone with extended throw drive assembly, sealed non-resonant asymmetrical chamber format


350W (at less than 0.5% THD)
900W (peak)

Audio Controls

±10dB at 25Hz

High Pass Filter Frequency

Bypass, 40Hz, 70Hz

Low Pass Filter Frequency

30, 35, 45, 55, 65, 80Hz


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

Power Draw

Max: 300 Watts
Idle: 15 Watts
Standby: 10 Watts


70 lbs. (31.8 kg)


17.9" x 17.1" x 16.5 "
(45.4cm x 43.5cm x 41.8cm)

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