In-Wall Speaker

Titanium dome tweeters and mineral-filled polypropylene drivers ensure great performance, while bezel-free paintable grilles that are secured with high-strength magnets provide an aesthetic that blends invisibly into any room. Each model comes with an extremely robust mounting-lock system that couples with the speaker’s vibration-resistant ABS chassis when installed.

$249.95 each
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Affordable High-Performance Solutions

The Installer Series™ by MartinLogan is a line of affordable high-performance products, featuring custom installation solutions for in-wall, in-ceiling, and outdoor applications. Manufactured to the highest standards of quality, these products are available through authorized specialty custom installation specialists and carry the full MartinLogan warranty.

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ML-66i Specifications

Specifications are subject to change without notice

Frequency Response

75–20,000 Hz ±3dB

Recommended Amplifier Power

20—140 watts per channel


89 dB/2.83 volts/meter


8 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers. Compatible with 4, 6, or 8 Ohm rated amplifiers.

Crossover Frequency

2500 Hz

High Frequency Transducer

3/4" (2.5cm) titanium dome

Low Frequency Transducer

Two 5.5” (14cm) mineral-filled polypropylene cones


Spring clip accommodates wire up to 12AWG


5.9 lbs. (2.7 kg)

Dimensions (overall size)

9.3" x 12.7" x 3.4 "
(23.7cm x 32.3cm x 8.6cm)

Cut-Out Dimensions

11.625" x 8.25"
(29.5 cm x 20.9 cm)

Projection From Wall Surface

0.2" (0.5cm)

Depth Behind Wall Surface

3.2" (8.1 cm)

Customer Reviews For ML-66i

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  • Monday, September 18, 2017

Phenomenal speakers, great quality