MartinLogan Motion 4i is a 2-way Passive Bookshelf speaker by MartinLogan. It was released in 2023. It features a 1 x 1.4" Folded Motion Ribbon Tweeter and 1 x 4" Woofer. The speaker has a frequency range of 70-23k Hz and a sensitivity of 90 dB.
MartinLogan's Motion Series of Loudspeakers
Motion 4i is a member of MartinLogan's Motion series of Passive speakers. The Motion range are MartinLogan's popular speakers using the brand's Folded Motion tweeter in conventional cabinets. Below you can see the main specs of these speakers.
See all 10 MartinLogan Motion models compared »
MartinLogan Motion Series Speakers
MartinLogan Motion Series Speakers
Frequency Response of the MartinLogan Motion 4i Speaker
MartinLogan Motion 4i has a Frequency response range of 70-23k Hz. With a minimum frequency of 70 Hz, it is hard to expect a strong bass response from Motion 4i so depending on your use case, using a subwoofer will significantly help to widen the response range.
Here we have a comparison of how Motion 4i's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
Bookshelf Speakers
Thinking about a subwoofer for the MartinLogan Motion 4i?
Impedance and Sensitivity
MartinLogan Motion 4i's nominal impedance level is
4 ohms and has a sensitivity of
90 dB.
Sensitivity
Bookshelf Speakers
Nominal Impedance of the 4 Ohms means that the MartinLogan Motion 4i is a difficult to drive speaker from nominal Impedance perspective, make sure that you choose an amplifier than can provide 4 Ohms for this speaker.
Many AVRs (audio/video receiver) in the market may have difficulty when the speakers dip below the 4 Ohms levels (this may cause clipping or even physical damage), so we recommend to not pair the MartinLogan Motion 4i with an AVR but use an Integrated Amplifier instead.
Sensitivity
90dB of the MartinLogan Motion 4i is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise. Work out how loud the MartinLogan Motion 4i plays in your room →
Running more than one pair from a single amplifier? Check the load it would present →
What amplifier does the MartinLogan Motion 4i need?
At normal listening levels in a medium room, about
15–240 W
per channel into 4 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? Integrated amplifiers under $300, or every amplifier we cover.
Input Type
Motion 4i features Spring post type connectors.
Work out what gauge speaker cable this run needs →
MartinLogan Motion 4i External Dimensions and Weight
MartinLogan Motion 4i has external dimensions of (Height x Width x Depth) (322.3 x 144.5 x 144.5mm ).
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 Motion 4i is approximately 208.8cm2 / 32.4inch2.
To get a better perspective on the real life size of MartinLogan Motion 4i, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).
MartinLogan Motion 4i Speaker Size Compared to a Compact Disc
Here we place the MartinLogan Motion 4i virtually next to a standard width amplifier and turntable on a BDI Octave Media Cabinet to get a better idea about the size.
MartinLogan Motion 4i Speaker next to an amplifier and turntable
Find speakers that fit your shelf or alcove → · Work out where they should sit in the room →
WeightThe MartinLogan Motion 4i weighs 2.72kg / 6lbs per piece. Here is a comparison of how Motion 4i's weight compares with the average, max and min weights in its class.
Weight
All Bookshelf Speakers
Available colors
MartinLogan Motion 4i is available in Gloss Black.
Wall Mounting
Motion 4i doesn't sport any built-in mounting bracket, so you need an external structure to mount it on walls.
Recommended Accessories
Here is a list of accessories that we think you may need for the MartinLogan Motion 4i.
- Speaker Cable and Connectors
- Vibration Isolators: IsoAcoustics isolators are our favorite isolators but you may find more affordable options too.
- Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.
- Speaker Stands: Stands bring your bookshelf speakers to ideal height (rule of thumb is to have the tweeter level with your ear in your listening position), helps stability and acoustical isolation.
Warranty
5 Yrs w/ Registration of parts warranty and 5 Yrs w/ Registration of labor warranty is generally provided by the manufacturer.