MartinLogan Motion 15 Bookshelf Speakers – Folded Motion, Boxed

MartinLogan Motion 15 Bookshelf Speakers – Folded Motion Tweeter, High-Gloss Black, Original Boxes, Very Good Condition

A genuinely different-sounding bookshelf speaker from the company that spent three decades building electrostatics — and this pair comes complete with its original packaging.

The Folded Motion Tweeter

The reason to want these is the tweeter. MartinLogan’s Folded Motion driver is not a dome at all; it is a pleated ribbon. Where a conventional one-inch dome pushes its whole surface back and forth, the folded diaphragm squeezes air out from between its pleats and barely has to move. The result is very low mass, very little excursion, and none of the distortion and lag that come with shifting a heavier part further. What you hear is treble that is fast and detailed without ever turning hard or splashy, spread evenly across a wide listening area rather than beamed at one seat.

The Numbers Behind It

The numbers behind it are worth reading. The transducer measures just over an inch by an inch and a half, but its folded diaphragm unfolds to 5.25 by 1.75 inches of radiating surface — several times what a dome of that size could offer. Below it sits a 5.25-inch aluminium cone on a cast basket, in a non-resonant asymmetrical chamber with a rigid structured dust cap to suppress cone break-up.

Amplifier Matching

They are also unusually easy to drive. At 92dB sensitivity these are considerably more efficient than most bookshelf speakers of this size, so a modest amplifier goes a long way. The nominal load is 5 ohms and MartinLogan rates them for anything from 20 to 200 watts, which means they will sit happily on a vintage receiver or a serious modern integrated.

Voice-Matched to the Electrostatics

MartinLogan voice-matched the Motion series to their electrostatic ESL speakers, which is the company telling you plainly what they were aiming at. The press agreed — What Hi-Fi, Hi-Fi+, HiFi Critic and Audioholics all reviewed them warmly, and Sound & Vision named the series a Top Pick.

The Crossover

The crossover is not an afterthought either: custom air core coils, low DCR steel laminate inductors, polypropylene film capacitors in series, and overall system thermal and current protection.

Condition and Finish

This pair is finished in high-gloss black, and it is in high very good condition — the piano finish clean and free of the swirl marks and scuffs these show so readily.

The Original Boxes

They also come with their original boxes, which is worth more than it sounds. Safe transport now, easy moving later, and it is the packaging these were engineered to survive in.

Condition and Service

They have been thoroughly inspected and tested to confirm full functionality.

Features

• Folded Motion pleated-ribbon tweeter — very low mass, very low distortion
• 5.25″ aluminium cone woofer on a cast basket, rigid structured dust cap
• Non-resonant asymmetrical chamber design
• 92dB sensitivity — easy to drive, rewarding on modest power
• Voice-matched to MartinLogan’s electrostatic ESL series
• Custom 5-way tool-less binding posts
• High-gloss finish
• Original boxes included

MartinLogan Motion 15 Bookshelf Speakers Specifications

• Model: Motion 15
• Configuration: Two-way bookshelf
• Frequency Response: 60Hz – 25,000Hz (±3dB)
• Sensitivity: 92dB (2.83V/1m)
• Nominal Impedance: 5 ohms, compatible with 4, 6 or 8 ohm rated amplifiers
• Recommended Amplifier Power: 20 – 200 watts per channel
• Crossover Frequency: 2,700Hz
• High Frequency Transducer: 1″ x 1.4″ Folded Motion with 5.25″ x 1.75″ diaphragm
• Low Frequency Transducer: 5.25″ aluminium cone, cast basket
• Horizontal Dispersion: 80°
• Vertical Dispersion: 80°
• Inputs: Custom 5-way tool-less binding posts
• Dimensions: (Width x Height x Depth) 6.8 x 11.4 x 9.5 inches (173 x 290 x 241 mm)
• Weight: 12 lbs (5.4 kg) each

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