MartinLogan EFX is a 2-way Passive Dipole Surround speaker by MartinLogan. It was released in 2011. It features a Electrostatic Tweeter and 1 x 6.5" Aluminium Woofer.
A hybrid surround speaker: the curved XStat CLS electrostatic panel above the crossover and a 6.5 inch woofer below it. 90 dB sensitive, 6 ohms, 20-300 W recommended, 68 Hz to 22 kHz. ElectroMotion is the entry point to MartinLogan's electrostatic and Folded Motion range.
The speaker has a frequency range of 68-22k Hz and a sensitivity of 90 dB. MartinLogan EFX has an MSRP of 4400$ per pair.
Room Size Suitability
The size of the room where you plan to use the MartinLogan EFX is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| Listening Environment* |
Suitability |
| Near-field | Good |
| Small Room | Good |
| Mid-size Room | Average |
| Large Room | Poor |
| Very Large Room | No way |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)
MartinLogan's ElectroMotion Series of Loudspeakers
EFX is a member of MartinLogan's ElectroMotion series of Passive speakers. The ElectroMotion range are MartinLogan's most affordable electrostatic hybrid speakers. Below you can see the main specs of these speakers.
See all 5 MartinLogan ElectroMotion models compared »
MartinLogan ElectroMotion Series Speakers
Frequency Response of the MartinLogan EFX Speaker
MartinLogan EFX has a Frequency response range of 68-22k Hz and Power Range of 20-300 watts. With a minimum frequency of 68 Hz, it is hard to expect a strong bass response from EFX so depending on your use case, using a subwoofer will significantly help to widen the response range.
Here we have a comparison of how EFX's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
Surround Speakers
Thinking about a subwoofer for the MartinLogan EFX?
Crossover frequency of the MartinLogan EFX?
The crossover frequency of the EFX is set to 530Hz. This is the threshold frequency where the higher frequency signals over this level are sent to the tweeter and the lower-frequency signals are sent to the woofer by the crossover component.
Impedance and Sensitivity
MartinLogan EFX's nominal impedance level is
6 ohms and has a sensitivity of
90 dB.
Sensitivity
Surround Speakers
Nominal Impedance of the 6 Ohms makes the MartinLogan EFX a relatively difficult to drive speaker compared to more frequently found 8 ohms speakers from nominal Impedance perspective.
Sensitivity
90dB of the MartinLogan EFX is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise. Work out how loud the MartinLogan EFX plays in your room →
Running more than one pair from a single amplifier? Check the load it would present →
What amplifier does the MartinLogan EFX need?
At normal listening levels in a medium room, about
10–160 W
per channel into 6 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? Integrated amplifiers under $5,000, or every amplifier we cover.
Input Type
EFX features Binding post type connectors. Bi-amping and Bi-wiring are not possible.
Work out what gauge speaker cable this run needs →
MartinLogan EFX External Dimensions and Weight
MartinLogan EFX has external dimensions of (Height x Width x Depth) 48-3/4 x 9-3/8 x 6-1/2inch (1239.0 x 238.0 x 165.0mm ).
Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base area of MartinLogan EFX is approximately 392.7cm2 / 60.9inch2.
Find speakers that fit your shelf or alcove →
WeightThe MartinLogan EFX weighs 11.10kg / 24.4lbs per piece. Here is a comparison of how EFX's weight compares with the average, max and min weights in its class.
Weight
All Surround Speakers
Weight
Surround Speakers under $5,000
Cabinet type and Materials
MartinLogan EFX has a
Dipole type cabinet.
Does the MartinLogan EFX come with a Grille?
EFX comes with grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.
Recommended Accessories
Here is a list of accessories that we think you may need for the MartinLogan EFX.
Official Product Page
Official manufacturer's product page for the MartinLogan EFX speaker can be found below:
Official Product Page for MartinLogan EFX