MartinLogan Dynamo 400 – 8” 150W Subwoofer


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Versatile, compact, and affordable, Dynamo is engineered to MartinLogan’s highest standard to deliver superior bass performance.

Every element of Dynamo, from driver to amplifier to crossover to cabinet, is meticulously designed and manufactured to our highest standard. The result is staggering low-frequency performance for a subwoofer of its size and price. And its versatility is second to none. Variable phase and low-pass crossover controls enable custom tailoring to any system and environment. Dynamo can also be quickly reconfigured for either down- or front-firing operation.

Dynamo 400

Affordable Low-Frequency Accuracy

Dynamo 400 features a 150 Watt (peak) amplifier, 8-inch audiophile grade woofer, and RCA and speaker level input options. Dramatic bass detail and attack, superb extension, and room-shaking output ensure a compelling music and home theater experience.

Dynamo 400 Product Highlights

8-inch inverted surround poly cone woofer
150 Watts (peak) amplifier
Low-turbulance, ported design
RCA and speaker level inputs


Frequency Response
30–200 Hz ±3 dB. Anechoic in LFE mode.
RCA: 8,300 Ohms
Speaker Level: 2,000 Ohms (red to black)
Low Frequency Transducer
8” (20.3cm) high-excursion, inverted surround, polypropylene cone in a stamped steel basket with extended throw driver assembly. Ported.
75 Watts (150 peak)
Controls (Backplate)
Level: Min–Max
Low-Pass Filter: 35–120Hz, Bypass
Phase: 0°, 180°
Power Mode: On, Auto
Line Level: Left, Right/LFE
Speaker Level: Left and Right via banana jacks
Power Draw
Typical: 20W, Max: 90W, Idle: 4W, Standby: 0.5W
28.5 lbs. (12.9 kg)
15.2″ x 13.3 ” x 13.7 ”
(38.5 cm x 33.7cm x 34.8 cm)
Satin Black



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