MartinLogan Motion CI MW4-LCR vs MartinLogan 8i Comparison

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MartinLogan Motion CI MW4-LCR

Passive In-wall | 78-25kHz

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MartinLogan 8i

Passive Center Channel | 70-23k Hz

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MartinLogan 8i

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MartinLogan 8i

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MartinLogan Motion CI MW4-LCR vs MartinLogan 8i Speaker Comparison

In this review, we will be comparing two different types of speakers by MartinLogan. MartinLogan Motion CI MW4-LCR is a In-wall speaker whereas the Motion 8i is a Center Channel speaker.

Let's have a brief look at the main features of MartinLogan Motion CI MW4-LCR and MartinLogan 8i first before getting into our more detailed comparison.

Key Specs	MartinLogan Motion CI MW4-LCR	MartinLogan 8i
Brand	MartinLogan United States · founded 1982	MartinLogan United States · founded 1982
Design	2-way	2-way
Tweeter	1" Folded Motion Ribbon	1.0 x 1.4" Folded Motion
Woofer	2 x 4" Fiberglass	2 x 4" poly cone woofers with rigid dust caps
Frequency response	78-25kHz	70-23k Hz
Sensitivity	93 dB	89 dB
Impedance	8 ohms	4 ohms
Power range	50-100 watts	20-180 watts
Weight	2.77kg / 6.1lbs	3.86kg / 8.5lbs
Dimensions (H x W x D)	5.2500" x 11.8750" x 2.6875" 134.0 x 302.0 x 69.0mm	5-9/16" x 22-1/8" x 5-1/4" 142.0 x 562.0 x 134.0mm

Motion CI MW4-LCR and Motion 8i are members of MartinLogan's Motion series of speakers. Below you can find the loudspeakers from this series.

MartinLogan Motion Series History

Model	Body	Frequency	Sensitivity	Impedance	Woofer
MartinLogan 60XTi	Floor-standing	35-25k Hz	94 dB	4Ω	2 x 8"
MartinLogan 15i	Bookshelf	60-25k Hz	92 dB	5Ω	1 x 5.25"
MartinLogan 35XTi	Bookshelf	50-25k Hz	92 dB	4Ω	1 x 6.5"
MartinLogan 40i	Floor-standing	40-25k Hz	92 dB	4Ω	2 x 6.5"
MartinLogan 50XTi	Center Channel	50-25k Hz	94 dB	4Ω	2 x 6.5"
MartinLogan 20i	Floor-standing	46-25k Hz	90 dB	4Ω	2 x 5.5"
MartinLogan LX16	Bookshelf	60-25k Hz	92 dB	5Ω	1 x 5.25"
MartinLogan 30i	Center Channel	65-25k Hz	91 dB	4Ω	1 x 5.25"
MartinLogan 6i	Center Channel	120-23k Hz	89 dB	6Ω	2 x 3.5"
MartinLogan 8i	Center Channel	70-23k Hz	89 dB	4Ω	2 x 4"

What size room are the MartinLogan Motion CI MW4-LCR and MartinLogan 8i speakers good for?

The size of the room in which you are planning to use these loudspeakers is an important decision factor. Here we have compared their suitability to various sizes of environments considering their size and max power parameters:

Listening Environment*	MartinLogan Motion CI MW4-LCR	MartinLogan 8i
Near-field	Average	Poor
Small Room	Good	Average
Mid-size Room	Average	Good
Large Room	Poor	Average
Very Large Room	Bad	Poor

(* 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.)

The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.

Drivers

Both Motion CI MW4-LCR and Motion 8i are 2-way speakers.

MartinLogan Motion CI MW4-LCR

MartinLogan 8i

TweeterWoofer

Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.

Driver	MartinLogan Motion CI MW4-LCR	MartinLogan 8i
Driver Setup	2-way	2-way
Tweeter	1-inch	1.0 x 1.4-inch
Midrange	-	-
Woofer	2 x 4-inch	2 x 4-inch

Motion CI MW4-LCR features a 1" Folded Motion Ribbon Tweeter and 2 x 4" Fiberglass Woofer. On the other hand, the Motion 8i features a 1.0 x 1.4" Folded Motion Tweeter and 2 x 4" poly cone woofers with rigid dust caps Woofer.

Frequency Response

Motion CI MW4-LCR has a frequency range of 78-25kHz whereas Motion 8i has a frequency range of 70-23k Hz. With a minimum frequency of 70Hz, the Motion 8i can go significantly deeper on the low side and provide stronger bass compared to the Motion CI MW4-LCR's min frequency of 78Hz.

The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the In-wall class in our database.

Low Frequency

In-wall Speakers

Motion CI MW4-LCR

Motion 8i

Min

Average

Median

Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.

Impedance and Sensitivity

Motion CI MW4-LCR is a 8 ohms speaker compared to the Motion 8i which has a nominal impedance of 4 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the Motion 8i can provide this impedance level.

These two speakers also have different sensitivity levels. Motion CI MW4-LCR sensitivity is rated at 93 dB and the Motion 8i's is rated at 89 dB. This 4 dB difference makes the MartinLogan Motion CI MW4-LCR a more sensitive speaker compared to MartinLogan 8i, hence will play louder with the same amount of watts.

Sensitivity

In-wall Speakers

Motion CI MW4-LCR

Motion 8i

Min

Average

Median

Power Range

Power range is the range of input power in watts RMS that a loudspeaker is designed to handle. Staying within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.

Motion 8i can handle a max power of 180 watts RMS, whereas Motion CI MW4-LCR has a max power handling value of 100 watts RMS, 80 watts less than the Motion 8i.

Note that higher power handling does not make a speaker louder: that depends mainly on sensitivity and impedance. The calculator below shows how loud each of these actually plays on a real amplifier.

Which plays louder on your amplifier?

Starting with a popular amplifier - change it to the one you own, or any you are considering, and watch both numbers move.

Amplifier - change this

Distance

Playing as

MartinLogan Motion CI MW4-LCR

MartinLogan 8i

Input Type and Bi-Amping / Bi-Wiring

Motion CI MW4-LCR features Spring post type posts and Motion 8i has a Spring post type posts. None of these speakers feature bi-amping/bi-wiring.

MartinLogan 8i's Spring post terminals

Physical Specs

The size of a speaker can sometimes be an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare MartinLogan Motion CI MW4-LCR's and MartinLogan 8i's external dimensions. MartinLogan Motion CI MW4-LCR has external dimensions of 134.0 x 302.0 x 69.0mm (5.2500-inch x 11.8750-inch x 2.6875-inch) whereas MartinLogan 8i has external dimensions of 142.0 x 562.0 x 134.0mm (5-9/16 x 22-1/8 x 5-1/4inch).

MartinLogan 8i is clearly the larger of the two speakers. Its body is 260mm wider, 8mm taller and 65mm deeper than MartinLogan Motion CI MW4-LCR.

What's in the Box of MartinLogan Motion CI MW4-LCR?

Here are the items that are included inside the box of Motion CI MW4-LCR:

In-wall loudspeaker
Grille
Torx-bit
User-feets Manual
Cutout Template

What's in the Box of MartinLogan 8i?

Here are the items that come with the Motion 8i:

LCR loudspeaker
Grille
2 Wall-bracket
2 Shoulder bolts
4 Rubber bumpers
Cleaning cloth
User-feets Manual (En/Fr)
Installation template
Product Registration Card

Reasons to choose MartinLogan Motion CI MW4-LCR over MartinLogan Motion 8i

Sensitivity	93 dB vs 89 dB	Play louder with same amount of amplification power
Nominal Impedance	8 ohms vs 4 ohms	Less selective with amplifiers
High Frequency Response	25k Hz vs 23k Hz	Generates higher frequency
Height	134mm vs 142mm	Easier to fit in smaller spaces
Base Surface Area	208cm² vs 753cm²	Takes less floor space

Reasons to choose MartinLogan Motion 8i over MartinLogan Motion CI MW4-LCR

Max Input Power	180 watts vs 100 watts	Handle more power from your amplifier
Low Frequency Response	70 Hz vs 78 Hz	Generates deeper bass
Price per pair*	450USD vs 1100USD	costs less (*prices may change depending on the seller, location and time)

MartinLogan Motion CI MW4-LCR vs MartinLogan 8i Specs Table

Detailed comparison of specifications

General	MartinLogan Motion CI MW4-LCR	MartinLogan Motion 8i
Brand	MartinLogan	MartinLogan
Speaker Type	Passive In-wall Speaker	Center channel speaker
Power Range	50-100 watts	20-180 watts
Sensitivity	93 dB	89 dB
Impedance	8 ohms	4 ohms
Frequency Response	78-25kHz	70-23k Hz
Drivers
Woofer Quantity	2	2
Woofer Size	4"	4"
Woofer Composition	Fiberglass	poly cone woofers with rigid dust caps
Woofer Surround Material	Rubber	n/a
Tweeter Size	1"	1.0 x 1.4"
Tweeter Type	Folded Motion Ribbon	Folded Motion
Aimable Tweeter	No	No
Midrange Driver	No	No
Suggested Break-in Period	n/a	Allow 72 hours of break-in at 90 dB
Physical Specs
Height	134.0mm (5.3")	142.0mm (5.6")
Width	302.0mm (11.9")	562.0mm (22.1")
Depth	69.0mm (2.7")	134.0mm (5.3")
Weight	2.77kg (6.1lbs)	3.86kg (8.5lbs)
Enclosure	In-wall	Passive Radiator
Available Colors	n/a	Gloss Black, Matt White, Red Walnut
Grille	n/a	Yes
Moisture Resistancy	No	No
Connections
Biamp Inputs	No	n/a
Other
Parts Warranty	5 Years	5 Yrs w/ Registration
Labor Warranty	5 Years	5 Yrs w/ Registration

Verdict

Siblings in MartinLogan's Motion series, so they share a family sound. It comes down to size, output and price.

Area	Better	Why
Bass	B	MartinLogan 8i digs deeper - 70Hz against 78Hz. A subwoofer would even that out.
Amplifier needs	A	MartinLogan Motion CI MW4-LCR is more sensitive (93dB vs 89dB), so it goes louder on the same amplifier.
Amplifier match	A	MartinLogan Motion CI MW4-LCR is the easier load at 8 ohms; the other is 4 ohms and wants an amplifier rated for it.
Headroom	B	MartinLogan 8i takes more power (180W vs 100W) - more in hand in a big room.
Size	depends	MartinLogan Motion CI MW4-LCR is easier to place; MartinLogan 8i is bigger, which usually goes with fuller bass. Your room decides.
Type	depends	A Passive In-wall against a Passive Center Channel - a different job rather than a better one.
Cabinet	depends	In-wall vs Passive Radiator.
Price	B	MartinLogan 8i is cheaper - $450 against $1,100, about 59% less; arguably a different class.

A MartinLogan Motion CI MW4-LCR B MartinLogan 8i
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.

Which should you choose?

Neither runs away with it - they trade advantages. Let the "depends" rows and your own room settle it. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 78Hz anyway, so judge these on the other rows instead. Match it to your room: we rate MartinLogan Motion CI MW4-LCR the better fit for near-field listening and a small room, and MartinLogan 8i for a mid-size room and a large room.

And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.