Motion 4i vs Motion 4
The Motion 4 matches the Motion 4i on sensitivity (90 dB), impedance (4Ω), low-frequency extension (70 Hz), and ways (2).
AI-generated product photo — not official manufacturer imagery.
LoudspeakersBookshelf SpeakersDiscontinued
Estimated price (community-sourced)
$175
Around — community and catalog average, updates slowly
About the Motion 4i
The MartinLogan Motion 4i is a compact bookshelf speaker inspired by the company's ultra-high-end electrostatic loudspeakers. It features an innovative Folded Motion tweeter with a low-mass diaphragm providing lightning-fast response and large surface area for detailed highs, paired with a 4-inch paper cone woofer and Cascading Bass Reflex Port for surprisingly deep bass from a small enclosure. The proprietary Vojtko crossover ensures seamless integration. Flexible mounting options include tabletop, on-wall, or upside-down installation. Ideal for stereo or home theater setups, it delivers smooth, refined sound with wide dispersion and dynamic range at an affordable price.
Specifications
Transducer Specifications
Driver and acoustic performance characteristics
- Sensitivity
- 90 dB SPL @ 1W/1m
- Impedance
- 4Ω
- Frequency Response
- 70 Hz - 23 kHz
- Power Handling
- 75W
- Min. Amplifier Power
- 20W
- Max. Amplifier Power
- 150W
Speaker Design
Driver configuration and enclosure design
- Configuration
- 2-way
- Driver Type
- Folded Motion transducer and paper cone woofer
- Driver Size
- 5.25"
- Driver Count
- 2
- Enclosure Type
- ported
- Crossover Frequency
- 2.9 kHz
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 142 × 320 × 145 mm (W × H × D)
- Available Colors
- gloss black
Key Specifications
Sensitivity: 90 dB
Impedance: 4Ω
Frequency: 70-23000 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions