In a surround system, the centre channel does the heaviest lifting. The bulk of every film's dialogue and a good share of the on-screen action come from this one speaker, so if it isn't clear, the whole system suffers. The Foundation C1 is MartinLogan's answer for the Motion Foundation range, a compact, low-profile centre that delivers crisp, intelligible dialogue and the same airy detail as its bookshelf siblings, finished here in Satin White with subtle silver trim to match the rest of the family.
The C1 anchors the front stage with clarity as its first priority. Voices stay distinct and natural whether the scene is a quiet conversation or the middle of a loud action sequence, so you can follow what's being said without constantly reaching for the volume. That clarity carries over to multi-channel music too, where the centre fills in the body and presence that a pair of speakers alone can leave thin.
Like every Motion Foundation model, the C1 is built around the Gen2 Obsidian Folded Motion Tweeter S. Its pleated thin-film diaphragm packs a large radiating surface into a tiny, lightweight panel that barely needs to move, which gives it the speed and precision to reproduce fine detail with the open, unforced treble MartinLogan is known for. Paired with a Folded Motion Waveguide, it spreads that detail evenly across the room and sidesteps the reflections that blur dialogue, so the sound holds together whether you're in the middle seat or off to the side.
Horizontal centre channels often suffer from lobing, where the two woofers either side of the tweeter interfere with each other and smear the sound off-axis. MartinLogan addresses this with its signature 2.5-way Anti-Lobing crossover, the same approach used in the more premium C100 and C10. A pair of 5.5" aluminium mid-bass drivers, built on cast aluminium baskets with non-resonant sealed chambers, are configured so the C1 behaves more like a larger three-way design while staying slim enough to sit neatly under a television. The stiff aluminium cones keep the midrange clean and the bass tight down to 53Hz.
A sensitivity of 91dB and a recommended amplifier range of 15 to 100 watts make the C1 a straightforward partner for any decent AV receiver, though its 4-ohm impedance is best paired with a receiver that drives lower impedances comfortably. Connection is via five-way binding posts, and the low, space-conscious cabinet is designed to tuck onto a media unit or shelf without crowding the screen. Voiced to blend seamlessly with the Foundation B1, B2 and the floorstanders, it completes a tonally matched front stage for a proper home cinema.
Type: 2.5-way passive centre channel speaker
Cabinet: Rear ported
High-frequency driver: 0.94" x 1" Gen2 Obsidian Folded Motion Tweeter S, 3.5 sq in diaphragm Waveguide: Folded Motion Waveguide
Mid-bass drivers: 2 x 5.5" aluminium cone, cast aluminium basket, non-resonant sealed chamber
Centre design: 2.5-way Anti-Lobing crossover Frequency response: 53Hz to 23kHz, plus/minus 3dB
Crossover frequency: 2,900Hz / 3,200Hz Sensitivity: 91dB Impedance: 4 ohms Recommended amplifier power: 15 to 100 watts
Tweeter dispersion (H x V): 90 degrees x 90 degrees
Connectors: Five-way binding posts
Finish: Satin White with silver trim
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