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The M-Duo fits right in as a flagship addition to the M-Series, offering a fun, yet only mildly V-shaped sound. These IEMs are far from neutral or analytical. The first thing anyone will notice upon listening to the M-Duo is the earthshaking subbass response, which enjoys a powerful boost along with the entire bass range. The result is a dominant and fully extended bottom end that remains well controlled. The bass may lag behind armature models in speed but makes up for this with great impact and control.
The midrange is a touch laid back but does not feel recessed. Male vocals are not quite as forceful but are thickened by the strong bass boost. On the contrary, female vocals and guitars are very aggressive; this sets the M-Duo apart from the typical "fun" sound.
Treble is detailed and sparkly with good extension, but does not come across as particularly sibilant. Cymbals have a natural and impactful sound. There is a slight tendency towards sibilance but nothing near the grating levels I experienced on the JVC FX101 and Philips 3590.
The overall sound is on the warmer side and very energetic across the board. Soundstage depth falls behind by nature of the forward presentation but width, clarity and instrument separation are great.
I mostly listen to rock and metal, and have found these M-Duos to possess great versatility across genres.. My only gripes are that I haven't found the ideal tips for them yet, and isolation could be better. Some will not like that there is no version without an inline remote/mic, but it is a convenient addition for smartphones and seems durable. The M-Duos represent a very solid value at their price point by offering a nice accessory package, outstanding build quality, great usability and an aggressive, clear sound comparable to much more expensive IEMs. A spectacular value, built well and backed by the best customer care I have seen in the business.
Mic Quality: 9.5/10
Overall Sound: ****1/2
MEElectronics Customer Service: *****
Cons: - Remote/mic position hindered when worn over the ear
- Mild driver flex
- Average Isolation (need to blast away louder noises)
- Longer tips may be uncomfortable
- Soundstage wide but lacking in depth
- No version without remote/mic (for some a Con)
Other Thoughts: The Meelectronics M-Duo is the newest addition to their Signature series of in-ear headphones. Its dual dynamic drivers boast strong and well-extended bass, including a separate woofer and tweeter. I bought the M-Duo directly from Meelec and was pleased to see it did not skimp on packaging or accessories. Accessories include a redesigned hard clamshell case, shirt clip, and 6 sets of tips in various lengths and sizes. The tips are soft and of pretty high quality. Overall, a solid accessory package.
The contrasting color design on the housings makes for an attractive and classy look without being overly eye-catching. The build features beefy strain reliefs all around on a solid, kevlar-reinforced cable. The cable below the Y-split thick and supple and terminates with an extremely robust looking L-plug. Unlike those used on many flimsier "buds", I would not expect the cable of the M-Duo to come apart from normal use. The housings are solid metal and quite bulky, but feel durable. My only worry is that the cable going to the housings is a little thin. The remote/mic is unobtrusive and the mic quality is very good. As with all inline controls, it can potentially be a durability concern. It is too early to tell if these M-Duos will last the test of time but so far the durability seems very good. Mild driver flex is present.
Microphonics are reduced using the included shirt clip and nonexistent when worn over-the-ear.
Isolation is decent for a vented design and can be improved using the triple flanges or foam tips, but is at best just above average. Noise leakage is very low and does make up for the lack of isolation somewhat.
The housings of the M-Duo are rather large and heavy, but need only to be shallowly inserted. The stock tips are soft, fit well and are very comfortable. The triple flange tips offer a more secure fit and improve bass response, but trade a significant amount of comfort and can cause gradual ear fatigue. Foam is another option for those willing to routinely replace the fragile tips, but I highly recommend trying out all the included tips first.