MartinLogan Motion 4i Bookshelf Speaker

Original price was: $249.99.Current price is: $199.99.

Free Lifetime Technical Assistance
SKU: Motion 4i


Motion i Compact

Inspired by the clarity and detail of MartinLogan’s
ultra-high-end electrostatic loudspeakers, Motion 2i, 4i, 6i, and 8i feature
exquisite Folded Motion tweeters and powerful bass technology in compact and
affordable packages.

Folded Motion Tweeter

Key to performance is the lightning fast response of the
tweeter’s light-weight diaphragm combined with a large surface area (much
larger than a typical one-inch dome tweeter) which together achieve a smooth,
refined sound with stunning dynamic range and jaw-dropping clarity—certain to
inspire envy in audiophiles and non-audiophiles alike. Precision Vojtko
crossover topology features custom air core coil inductors, low DCR steel
laminate inductors, and polyester film and low DF electrolytic capacitors for a
seamless sonic presentation.

Engineered Curves

Flexible installation options allow table top or on-wall
installation of all four speakers. The Motion 2i and 4i bookshelf speakers can
also mount upside down to facilitate placement high on a wall. The Motion 6i
and 8i mount horizontally or vertically around a wall-mounted flat screen


Frequency Response

70–23,000 Hz ±3dB


80° x 80°


90 dB/2.83 volts/meter

Nominal Impedance

4 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers.

Recommended Amplifier Power

20-150 watts per channel

Crossover Frequency

2,900 Hz

Crossover 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.

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 Driver

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.

Binding Posts

Push style with banana jacks


6lbs. (2.72kg) each

Overall Dimensions


12.6 x 5.6 x 5.7 (32cm x 14.3cm x 14.5cm)

Additional information

Weight 7.00000000 lbs
Dimensions 17.0 × 8.0 × 7.0 in


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