MartinLogan Motion30i Centre Speaker - MartinLogan Motion Series Centre Speakers
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Motion 30i Center Channel Speaker
Smaller multi-channel audio systems will benefit from the significant dynamic impact and detailed imaging revealed by a Folded Motion® tweeter and dual, rear-vented 5.5-inch aluminum cone woofers, and a proprietary Vojtko crossover network. Motion 30i delivers the classic broad soundstage of the Motion Series from a newly designed enclosure enhanced by the slightest of modifications, including the drive-stabilizing dust cap design and stiffened motor suspension. The speaker’s cabinet sports a reinforced baffle and a fabric grille. Available in three stylish finishes: gloss black, matte white, and red walnut.
Engineering, Without Compromises
What makes the Motion Series sound so amazing? MartinLogan's dedicated in-house engineering and design team started by utilizing and refining the most advanced, compact technologies and combining them with innovative engineering and time-honored cabinet construction techniques. The result is an emotionally engaging sound that rivals (and most times trounces) traditional loudspeakers of similar size and price. Our 'no compromise' philosophy gives Motion Series a unique sound you won't find anywhere else.
Sound Inspired by Electrostatic Speakers
The success of the Motion Series is directly attributed to its close relation to MartinLogan’s legendary ultra-high-end electrostatic loudspeakers. The desire to transmute that level of performance into a more traditional loudspeaker at a more affordable price drove the initial design imperatives that created the Motion Series.
Powerful Aluminum Cone Mid-Frequency and Bass Drivers
Custom built, low-distortion drivers pair high-power magnet structures with aluminum cone diaphragms to deliver massive excursion and sound output, preserve minute bass details, and maximize power handling capability, all without a hint of distortion. A unique concave dust cap design reinforces the strength and rigidity of the cone while reducing break up modes.
The use of aluminum for cones maximizes rigidity and strength of the drivers without adding excessive weight. This, along with the exceptional damping properties of aluminum, ensures the smooth, non-resonant response necessary for seamless blending with high-resolution Folded Motion tweeters. An added benefit of aluminum is its outstanding thermal conduction capability which allows cones to serve as efficient heat sinks for voice coils.
To deliver accuracy in the critical midrange, mid-frequency drivers feature a specially engineered "stiff" suspension. Stiffening the suspension (the spider and surround) raises the driver's resonant frequency and optimizes its performance to achieve a natural roll-off and inherently operate within an ideal range for a mid-frequency reproduction (as opposed to a comparably sized woofer).
Proprietary Vojtko Crossover Networks
Premium Motion Series speakers feature proprietary Vojtko crossover networks using polypropylene and low-DF electrolytic capacitors, custom-wound inductors, and thermal and current protection.
Vojtko crossovers are named after MartinLogan's chief audio technologist, Joe Vojtko. His unique approach to crossover design is as big of a part of the "MartinLogan Sound" as are electrostatic and Folded Motion thin-film driver technologies. A Vojtko crossover isn't so much a set of design requirements as it is a philosophy. Vojtko crossovers are designed in such a way that all drivers are kept within their optimal frequency range and balanced with one another. The drivers themselves are as much a part of a Vojtko crossover as are capacitors and resistors. Before the design of any crossover begins, drivers are carefully selected or designed to operate within a very intentional frequency range and with precise and predictable performance parameters. Vojtko crossovers are always built from high-quality parts, and care is taken to avoid overly complex topologies—a straightforward objective due to the careful selection of woofers and tweeters. The final (and most critical) aspect of a Vojtko Crossover is that final voicing is conducted in a space that is indicative of a real-world environment. This pragmatic approach allows MartinLogan speakers to sound their best in real-world rooms.
Specifications
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| Motion 50XTi | Motion 30i | Motion 8i | Motion 6i | |
| Frequency Response | 50–25,000 Hz ±3dB | 65–25,000 Hz ±3dB | 70–23,000 Hz ±3dB | 120–23,000 Hz ±3dB |
| Dispersion | 80° x 30° | 80° x 80° | 80° x 80° | 80° x 80° |
| Sensitivity | 94 dB/2.83 volts/meter | 91 dB/2.83 volts/meter | 89 dB/2.83 volts/meter | 89 dB/2.83 volts/meter |
| Nominal Impedance | 4 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers. | 4 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers. | 4 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers. | 6 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers. |
| Recommended Amplifier Power | 20-300 watts per channel | 20-200 watts per channel | 20-180 watts per channel | 20-130 watts per channel |
| Crossover Frequency | 900 & 2,200 Hz | 400 & 2,600 Hz | 3,000 Hz | 4,000 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. Tweeter thermal/current protection. | 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. | 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. | 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 | 1.25" × 2.4" (3.2cm × 6.1cm) Folded Motion XT Transducer with 4.5" x 2.75" (11.4cm × 7cm) diaphragm | 1" × 1.4" (2.6cm × 3.6cm) Folded Motion Transducer with 5.25" × 1.75" (13.3cm × 4.4cm) diaphragm | 1" × 1.4" (2.6cm × 3.6cm) Folded Motion Transducer with 5.25" × 1.75" (13.3cm × 4.4cm) diaphragm | 0.94" × 1" (2.4cm × 2.5cm) Folded Motion Transducer with 2.8" × 1.25" (13.3cm × 4.4cm) diaphragm |
| Low Frequency Driver | Two 6.5" (16.5cm) aluminum cone with cast poly- mer basket. Non-resonant asymmetrical chamber format. Rigid structured dust cap to reduce cone break-up modes. | Two 5.5” (14cm) aluminum cone with cast polymer basket. Non-resonant asymmetrical chamber format. Rigid structured dust cap to reduce cone break-up modes. | Two 4" (10.2cm) paper cone with stamped steel basket. Non-resonant asymmetrical chamber format. Rigid structured dust cap to reduce cone break-up modes. Sealed. | Two 3.5" (8.9cm) poly cone with stamped steel basket. Non-resonant asymmetrical chamber format. Rigid structured dust cap to reduce cone break-up modes. Sealed. |
| Binding Posts | Custom 5-way bi-wire tool-less binding posts | Custom 5-way tool-less binding posts | Push style with banana jacks | Push style with banana jacks |
| Weight | 30.5lbs. (13.8kg) each | 18lbs. (8.2kg) each | 8.5lbs. (3.85kg) each | 5.7lbs. (2.58kg) each |
| Overall Dimensions (HxWxD) |
7.6 x 22.8 x 12.8 (19.2cm x 58cm x 32.6cm) | 6.9 x 16.5 x 10.5 (17.5cm x 42cm x 26.6cm) | 5.6 x 22.25 x 5.2 (14.2cm x 56cm x 13.2cm) | 5.2 x 17.5 x 4 (13.2cm x 44.4cm x 10.1cm) |
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