Folded Motion Tweeter: MartinLogan's Folded Motion Tweeter
helps give the 4i bookshelf loudspeaker its natural, realistic high
frequency sound. Lightning fast transient response, combined with a large
surface area (8x that of a typical 1" dome tweeter) creates clear, dynamic, and
precise sound. The 1" x 1.4" Folded Motion Tweeter works by moving air (which
creates sound) perpendicular to the folded ridges of the diaphragm, similar to
how an accordion works. This extremely low mass diaphragm "squeezes" air and
requires almost 90% less excursion than the typical 1" 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.
4" Poly Cone Woofer: The MartinLogan 4i loudspeaker
features a 4" poly cone woofer with a stamped steel basket housed in a
non-resonant asymmetrical chamber. The poly cone woofer uses a rigid structured
dust cap to reduce cone break-up and distortion. This 4" cone woofer provides
rich, detailed midbass.
Precision Vojtko Crossover: To seamlessly blend the audio
output from the high frequency driver (tweeter) and the midbass driver (woofer),
the 4i loudspeaker features a precision Vojtko crossover (2900Hz)
utilizing custom air core coil and low DCR steel laminate inductors, polyester
film capacitors in series, and low DF electrolytic capacitors in parallel.
Folded Reflex Port Technology: MartinLogan engineers were
faced with a daunting task, create a compact speaker with low-end bass
reproduction found in speakers much larger. After a myriad of prototypes, they
created the Folded Motion Cascading Bass 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 bookshelf loudspeaker. 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. The Folded Motion Cascading Bass
Port exits the rear-panel of the speaker cabinet.
Curved High-Gloss Black Cabinet: Complementing the Motion 4
loudspeaker's sonic accuracy is its elegant, yet understated styling. A
high-gloss, piano black finish and subtle curves, along with MartinLogan's
signature perforated grille, give the Motion 4 speaker an elegant and timeless
look that will blend into almost any decor. The grille is magnetic
Spring-Post Connectors: The MartinLogan 4i speaker features
two spring-post connectors to attach your speaker wire. The spring-posts will
accept bare wire (16- to 10-gauge), pin-connectors, and banana plugs (single
Versatile Mounting Options: The MartinLogan 4i
bookshelf loudspeaker can simply be placed on a table-top, stand, shelf, or
other flat surface. Four self-adhesive rubber feet are included for safe and
secure placement. Using the included keyhole-slot bracket, you can wall-mount
the speaker at two different angles. This means you can point sound directly
toward the desired listening area for high or low wall mounting applications. In
addition the 4i is fitted with a 1/4"-20 threaded insert which allows you
to hang the speaker on the wall using optional articulating wall-mount brackets
- If the 4i is being mounted at approximately ear-level, the speaker
should be oriented with the tweeter at the top. This will disperse sound
directly towards the desired listening area.
- If the 4i is be mounted above ear-level, the speaker should be
oriented with the tweeter at the bottom. This will disperse the sound down
at a 20° angle towards the listening area.
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