Powerful compact bookshelf speaker with a Folded Motion™ tweeter and Folded Motion Cascading Bass-Reflex Port for deeper bass response. Voice-matched with MartinLogan ESL speakers.
Folded Motion® Tweeters
The signature Folded Motion tweeters utilize extremely low mass diaphragms that "squeeze" air, and require significantly less excursion than the typical 1-inch dome tweeter, which drastically minimizes distortion while providing a lightning fast response time. The increased surface area also provides a wide, yet controlled sound dispersion to create a realistic and carefully etched sound stage.
Flexible installation options allow table top or on-wall installation of all four speakers. The Motion 4i bookshelf speakers can also mount upside down to facilitate placement high on a wall.
Cascading Bass Reflex Port
MartinLogan engineers were faced with a daunting task - create a compact speaker with low-end bass reproduction found in speakers much, much larger. After many sleepless night and a myriad of prototypes, they created the Cascading Bass Reflex Port. This brilliant solution allows a long tuned port, which is folded over itself (think of a trombone's tuning arm) to be compacted and squeezed into the Motion 4i. The result is amazingly detailed low bass that can play at high volumes with minimum distortion - all thanks to the elegantly simple cascading fold that slows down and controls the air motion of the bass waves.
Martin Logan Motion 4i Speaker each
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) poly 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
Dimension: 12.6" x 5.6" x 5.7"
Weight: 6 Lbs.
Specifications are subject to change without notice