Theater i

The Reference Electrostatic Center Channel

A vast amount of engineering and design expertise in both electrostatic and dynamic transducer technology has allowed us to accomplish the seemingly impossible. Imagine the incomparable Prodigy loudspeaker magically transformed into center channel perfection—Theater i.

From the beginning, the center channel has been recognized as the most critical element in any home theater and multi-channel music system. It grabs your attention, grounds the cinematic experience, and holds you in the moment. Designed and executed precisely, the center channel bridges the main channels and provides a seamless sound stage that tracks the cinematic environment—to perfection. This is exactly what MartinLogan Theater i was designed and manufactured to do—effortlessly.

Launched in 2003

Price when discontinued:



Specifications are subject to change without notice

Frequency Response

70–22,000 Hz ±3dB

Recommended Amplifier Power

20‒500 watts per channel

Horizontal Dispersion



90 dB/2.83 volts/meter


4 Ohms, 3.1 at 20 Hz. Compatible with 4, 6, or 8 Ohm rated amplifiers.

Crossover Frequency

300, 3000 Hz

High Frequency Transducer

Three 1" (2.54) soft dome, controlled dispersion array

Mid Frequency Transducer

Patented Generation 2 CLS™ electrostatic transducer

Low Frequency Transducer

Two 6.5" (16.5cm) magnetically shielded. Non-resonance asymmetrical chamber format.


Custom-wound audio transformer, air core coils, polypropylene capacitors


5-way binding posts


57 lbs. (26 kg)

Dimensions (with wall-mount/stand)

13" × 43" × 11.5"
(33cm × 109.2cm × 29.2cm)

Dimensions (without wall-mount/stand)

10.5" × 43" × 11.5"
(26.7cm × 109.2cm × 29.2cm)

Customer Reviews For Theater i

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Frank Doghearty

  • Wednesday, July 3, 2013

As good as it gets, unless you are a millionaire.
Placing the box above my 60" TV provided the best sound. While the rack needs to be disassembled for wall mounting and the manual is virtually useless on this department, the process was easy enough for two people to do it. The sound is, as the name says, "theater." The sound is coming from the screen, filling the whole front. Even old mono movies sound great. As there is no vertical sound dispersion, the panel must face the listener. Although MLs usually require expensive amplifiers, my Harman Kardon 7550 drives this unit just fine (well, the HK, now discontinued, weights 45 pounds, originally retailed at $2,800, and it actually outputs 440 real Watts). At the moment, the fronts are not electrostatic, "only" ML Motion 12s, but they emulate ES sound at a lot lower price (the M12 produce 3-way, bidirectional sound). I could not be happier.