Pros: Powerful deep bass and detailed treble are not kidding (but small acoustic ruins it all)
Cons: Size of sounds are small. Acoustic of mids are limited. Despite being detailed, quality level of the treble isn't shining.
after M4 & Xiaomi Piston 2 (they were similar items), i see this one also following them. but with some bass & treble improvements added. that's okay, but unfortunately said improvements comes with an expensive price. mayday! we just lost vocals... in this small acoustic, with all the bass & treble attacks, where we were going to put our beautiful mids ? oh god, just forget about this...
it carries some 250hz amplification thus drums are very prominent. lowering them can reduce your headache. about the 30-60hz deep bass, yes it's improved but still sounds small due to low acoustics. just switch to an earphone with a wide acoustic and bigger sound size (and with a competing, powerful bass of course), you'll instantly feel the difference. so it's bass is not something that i can define as the "perfect bass" or game changer. same goes for the treble, yes you hear more details for shure but no one can say that it's successful on the quality side.
i'm not going to pass without mentioning the titles on yourbrainwavz.com. just look at that: "clear, balanced sound", "accurate sound". i can't help but wonder, who writes those titles ? no mention to deep bass ? no mention about treble attacks ? and with this small and limited acoustic reproduction, how can you call this "accurate" ?
i was writed my first review about this one based on my 2 day audition back in 2014. i took advantage of the discounts lately and ordered that 2 in 1 packages. one of them arrived already faulty and mp4nation sent a new one. it seems quality problems with M4-M5 is still active. but as i stated in the M4 review too, mp4nation has a great warranty service so if you really sure that this is your sound, what can i say... enjoy!