Motion 4i

Inspired by MartinLogan’s ultra-high-end electrostatic loudspeakers, the Motion® Series was created to provide stunning sound for your ultimate-performance home theater or stereo. MartinLogan’s dedicated in-house engineers carefully crafted the Motion Series to create an extremely affordable and compact product line that seamlessly blends our exquisite Folded Motion® transducers with powerful, compact bass technology. The result is a smooth, refined sound with stunning dynamic range and jaw-dropping clarity.

Motion 4i Compact Bookshelf Speakers
Audiophile performance without an audiophile price. Inspired by the clarity and detail of MartinLogan’s ultra-high-end electrostatic loudspeakers, Motion 4i features a Folded Motion tweeter, 4-inch paper cone woofer, and a proprietary Vojtko crossover network in a compact and affordable package. Low-frequencies are enhanced by a rear-firing Cascading Bass Reflex Port, a unique, long-volume port that delivers surprisingly big bass from a remarkably compact loudspeaker. Flexible installation options allow table top or on-wall installation. Motion 4i can also mount upside down to facilitate placement high on a wall. Available in gloss black.

Specifications

Specifications are subject to change without notice

Frequency Response	70–23,000 Hz ±3dB
Recommended Amplifier Power	20—150 watts per channel
Horizontal Dispersion	80°
Vertical Dispersion	80°
Sensitivity	90 dB/2.83 volts/meter
Impedance	4 Ohms Compatible with 4, 6, or 8 Ohm rated amplifiers.
Crossover Frequency	2,900 Hz
High Frequency Transducer	1″ × 1.4″ (2.6cm × 3.6cm) Folded Motion Transducer with 5.25″ × 1.75″ (13.3cm × 4.4cm) diaphragm
Low Frequency Transducer	4″ (10.2cm) paper cone with stamped steel basket. Non-resonant asymmetrical chamber format. Rigid structured dust cap to reduce cone break-up modes. Folded bass reflex port.
Components	Custom air core coil and low DCR steel laminate inductors. Polyester film capacitors in series and low DF electrolytic capacitors in parallel. Overall system thermal/current protection.
Inputs	Push style with banana jacks
Weight	6 lbs. (2.72 kg)
Dimensions	12.6″ x 5.6″ x 5.7 ” (32cm x 14.3cm x 14.5cm)