MartinLogan Motion 60XT Floorstanding Speaker Reviewed

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MartinLogan Motion 60XT Floorstanding Speaker Reviewed

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MartinLogan-60XT-cherry.jpgThe Downside
Notice that most of the music I cited above is jazz? Well, that's mostly what I like to listen to, but I like metal and pop, too. With these genres, the Motion 60XT is sometimes a little out of its element.

When I played one of my all-time-favorite rock recordings--a WAV file of the live version of "Highway Star" from Deep Purple's Live in Japan--I noticed that Ian Gillan's vocals lacked body, and the bass needed more slam and punch. The bass had a "high-Q" sound; I heard a big resonant peak but not much groove. Moving on to "Smoke on the Water," I loved the way I could hear Richie Blackmore's guitar reverberating in the concert hall in the intro. I loved the clarity of the organ and drums. But I didn't like the thuddy sound of the bass. I tried moving the speakers closer to and farther from the wall behind, and I tried moving my listening chair a couple of feet forward and backward, but I couldn't get the bass to smooth out.

The same thing happened when I played Miles Davis' "What It Is" from Decoy. Darryl Jones' slapped bass line makes this one of Miles' hardest-grooving tunes, but through the Motion 60XT, "What It Is" sounded thin. I got a good sense of the kick drum and the deep fundamental tones of the bass, but the harmonics of the bass and the fundamentals of the snare drum seemed to be attenuated.

After I had a chance to measure the Motion 60XT, I found out why. According to my measurements, the speaker's woofer section has a resonant peak at 80 Hz. As it happens, my room's deepest axial mode (the deepest frequency at which the room resonates) is at 20 Hz. This means I'm getting a boost at all the harmonics of 20 Hz, including 40, 60, and 80 Hz. Fortunately, it's a broad boost, so it tends to have a subjectively positive effect; it tends to make the bass sound a little more kick-ass, rather than colored or boomy. But it's right where the Motion 60XT has its big resonant peak, so it only makes the speaker's idiosyncrasy more apparent. My guess is that the resonant peak may also obscure the upper bass and lower midrange, which is why I found that voices sometimes sounded thin.

(BTW, anyone who wants to criticize my listening room as substandard should first consider that every room has axial modes. And consider that innumerable audio experts have visited this room and found it to sound not only good, but well above average...which is why I bought this house in the first place.)

I was much happier with the sound when I connected my Outlaw Model 975 surround sound processor and ran the Motion 60XT with a Hsu Research VTF-15H Mk2 subwoofer, with the crossover point set to 80 Hz. This let me tame the bass peak, in the process smoothing out the sound and filling in the upper bass and lower mids better.

Note that this is not just a room issue. I've tested hundreds of speakers in this room and only rarely encountered a situation like this. Most top speakers are not so room-sensitive. If one of your room's dimensions is 14 or 28 feet, you might have the same issue with the Motion 60XT.

Here are the measurements for the Motion 60XT speaker (click on the chart to view in a larger window).



Frequency response:
On-axis: �2.4 dB from 44 Hz to 20 kHz
Average: �4.0 dB from 44 Hz to 20 kHz

Minimum 2.1 ohms/250 Hz/-18 degrees, nominal four ohms

Sensitivity (2.83 volts/one meter, anechoic):
90.6 dB

The first chart shows the frequency response of the Motion 60XT; the second shows the impedance. For frequency response, two measurements are shown: at 0� on-axis (blue trace) and an average of responses at 0�, �10�, �20�, and �30� (green trace), all measured on the horizontal axis.

Three things are striking about this response plot. First is that the on-axis response throughout most of the audio band is extremely flat. The only deviation occurs with a peak at 300 Hz and a dip at 600 Hz, but it's minor, and it's possible it could be a measurement-related artifact (although nothing I tried could eliminate it). So that's great.

Second is that big hump in the bass response, centered at 80 Hz. I confirmed my ground plane bass response measurement by close-miking the woofers and ports, scaling the port response, and adding the woofer and port response together, and the resulting curve was very similar in shape.

Third is an artifact that's only hinted at in the chart: that big folded-ribbon tweeter's response off-axis is weak. At 30 degrees off axis, the response is down -4.2 dB at 10 kHz, -29.7 dB at 20 kHz. For the sake of comparison, the response of the Revel F208 (which has a conventional dome tweeter) is down -2.4 dB at 10 kHz, -4.8 dB at 20 kHz. This sharp roll-off in the off-axis treble response is likely to reduce the sense of space and "air" that the speaker delivers.

These measurements were done without grilles. Surprisingly, the big perforated-metal grille has less effect on response than most of the fabric grilles I've measured, with just a few minor deviations in response above 3.5 kHz, maxing out with a narrow, probably inaudible -1.1dB dip at 4.8 kHz.

Sensitivity of this speaker, measured quasi-anechoically from 300 Hz to 3 kHz, is comfortably high at 90.6 dB. You should get about +3 dB more output in-room, so the 94dB rating seems reasonable. Nominal impedance is four ohms, and the speaker drops to a low of 2.1 ohms; so, even though this speaker will play loud from just a few watts of power, you need an amp with plenty of current to drive it. Use a separate amp, a high-quality integrated amp, or a top-of-the-line A/V receiver.

Here's how I did the measurements. I measured frequency responses using an Audiomatica Clio FW 10 audio analyzer with the MIC-01 measurement microphone, and the speaker driven with an Outlaw Model 2200 amplifier. I used quasi-anechoic technique to remove the acoustical effects of surrounding objects. The Motion 60XT was placed atop a 28-inch (67-cm) stand. The mic was placed at a distance of two meters, and a pile of attic insulation was placed on the ground between the speaker and the mic to help absorb ground reflections and improve accuracy of the measurement at low frequencies. Bass response was measured using ground plane technique, with the microphone on the ground two meters in front of the speaker. Bass response results were spliced to the quasi-anechoic curves at 200 Hz. Quasi-anechoic results were smoothed to 1/12th octave, ground plane results to 1/3rd octave. Post-processing was done using LinearX LMS analyzer software.

Comparison and Competition
I hated comparing the Motion 60XT with my usual Revel F206 tower speakers, because the duel only made both speakers' weaknesses more apparent. Even though the F206 has a little resonant bass bump of its own, it sounded much more even and full than the Motion 60XT because the upper bass and lower mids were more in balance with everything else. Yet the Motion 60XT's big folded ribbon tweeter sounded substantially smoother and more natural than the F206's aluminum dome tweeter. Hearing my favorite speakers outclassed like this made me feel as sad as I did when my old Labrador retriever Buddy came in fourth in the Friendliest Dog contest at the Nuts 4 Mutts festival. (He's long gone, but I still have the ribbon, which just says "Participant.")

Considering that the F206 is $3,500, it's a potential competitor to the Motion 60XT, even though its 6.5-inch woofers won't pack as much punch. Other potential competitors are the $2,998/pair GoldenEar Triton Two tower, which has a smaller folded ribbon tweeter but an internally powered bass section with dual five- by nine-inch woofers; the $3,498/pair PSB Imagine T2 tower with three 5.25-inch woofers; and the $2,500/pair Monitor Audio Silver Series 10 with two eight-inch woofers. (There are more competitors, too, but these are among the best in their price range.)

All of these speakers are excellent; I'd be happy with any of them. I don't think any of them would give me that magical midrange and treble imaging and transparency I heard from the Motion 60XT. But the Triton Two and Imagine T2 sounded fuller and more balanced in my room, and I expect the Silver Series 10 would, too. (I haven't heard it, but I have tested many of Monitor Audio's recent speakers.) I expect they'd all deliver a more enveloping soundstage, too.

For the jazz listening I do (which is most of my listening), the Motion 60XT is easily one of the best speakers I've tested, delivering incredibly lifelike tonality and imaging. When the material gets heavier, the Motion 60XT's low-frequency idiosyncrasies make it less enjoyable to listen to, at least for my tastes and in my room. Another option, and probably the one I'd take, is the Motion 35XT, a bookshelf speaker with the same tweeter and a 6.5-inch woofer. Mate that with a good subwoofer, and you should have a pretty incredible system, with the flexibility to get the bass response tailored to perfection.

Every speaker has pros and cons, and only you can decide which mix of pros and cons works best for you. Fortunately, Magnolia carries the Motion 60XT and Motion 35XT, so hearing them for yourself shouldn't be difficult. I'd recommend you do, because the Motion 60XT definitely delivers the magic that audiophiles always seek but too often fail to achieve.

Additional Resources
MartinLogan Motion SLM-XL Floorstanding Speaker Reviewed at
MartinLogan Crescendo Premium Wireless Speaker System Reviewed at
� Check out our Floorstanding Speakers category page for reviews of similar products.

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