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A 75-inch screen spans more than five feet of wall. Most soundbars cover only part of that, so the sound stays bunched in the middle while the picture stretches out. The MartinLogan Discrete Cinema Soundbar 75 measures 65.4 inches wide. It runs nearly edge to edge under the screen it was built for.
Inside one slim bar are three discrete speakers: left, center, and right. Each one is wired separately. Because the bar is passive, your AV receiver or amplifier powers it and handles the decoding.
The Soundbar 75 carries 13 drivers. Three Gen2 Folded Motion Tweeters cover the highs, one per channel. Ten 4-inch woven fiberglass woofers handle the midrange and upper bass. Compared with the smaller Soundbar 65, MartinLogan doubled the woofers in the center channel and added more to the left and right channels.
The cabinet is just 4.76 inches tall and 2.37 inches deep, and it weighs 18 pounds. A low-profile wall bracket is included. You can also attach the bar to the TV itself with the MartinLogan TV Mount Kit, sold separately.
The bar is rated at 4 ohms and works with amplifiers rated for 4, 6, or 8 ohms. MartinLogan recommends 20 to 210 watts. It is designed for the front channels of a home theater rather than deep bass, so plan on a subwoofer.
Start with the tweeter. Each Gen2 Folded Motion Tweeter folds a 5.25 by 1.75 inch thin film diaphragm into a driver just 1 by 1.4 inches. That puts far more working surface in a small space than a typical dome tweeter. A Folded Motion Waveguide guides the output, with rated dispersion of 90 by 90 degrees.
That wide pattern is meant for real rooms, where family and friends spread across a sofa. It aims to reach every seat, not only the one in the middle, with the same tweeter on each channel.
The enclosure is sealed, extruded aluminum. Its strength allows thinner walls than MDF, which leaves more room inside a very slim shape. MartinLogan isolates the three channels from one another within the cabinet, so left, center, and right stay truly separate.
A 2.5-way crossover divides the signal between tweeters and woofers. Rated frequency response is 100 Hz to 25 kHz, ±3 dB. Sensitivity is 93 dB at 2.83 volts and one meter, an efficient rating that lets an everyday AV receiver drive the bar without strain.
Removable Phoenix-style connectors with tool-free levers let you pre-wire the bar before it goes up. Once it is mounted, recessed channels in the chassis keep the speaker cables out of sight.
Run three pairs of speaker wire from the front left, center, and right outputs of your AV receiver or multichannel amp. Seat them in the bar’s removable Phoenix-style connector, matching the printed positive and negative markings. Then hang the bar on its included wall bracket, or on the TV using the optional mount kit.
In the receiver’s speaker setup, choose Small for the front three channels and turn on the subwoofer. The bar’s rated response begins at 100 Hz, so start the crossover there or one step above. MartinLogan advises against pairing Discrete Cinema LCR and soundbar models across the front three. One bar, three channels, done.
Complete your theater with these companions:
No. It is passive, so it needs an AV receiver or multichannel amplifier with at least three channels to power the left, center, and right speakers.
It was sized for 75-inch class displays. The bar is 65.4 inches wide, 4.76 inches tall, and 2.37 inches deep.
Yes. The rated response starts at 100 Hz, and MartinLogan built the series to work with a subwoofer for deep bass.
The soundbar comes with a low-profile wall bracket and a Phoenix-style wiring connector. Wall screws are not supplied, so choose hardware that suits your wall. The TV Mount Kit is sold separately.
Yes, with the MartinLogan TV Mount Kit, which uses your TV’s VESA points and a third-party TV wall mount. If your TV has an IR sensor notch on its bottom edge, the bar may not sit fully flush.
MartinLogan recommends 20 to 210 watts. The bar is rated at 4 ohms and is compatible with amplifiers rated for 4, 6, or 8 ohms.
AV NIRVANA’s first look walks through the full Discrete Cinema series, including the passive soundbars, plus MartinLogan’s Depth Series subwoofers.
Want to learn more about home theater speakers, subwoofer placement, or choosing an AV receiver? Visit our Learning Center for guides, tips, and expert advice.
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