Originally Posted by Fernito
I have compared several M1s, and all of them sounded very different (I'm not talking about comparisons by memory, but A-B blind comparisons). The same with the M2 and M3 models (my M2, for example, are almost analytical-souding compared to other bazooka-like M2 I've tried).
My assessment of the M2 was the same... I was expecting a bass monster, but ended up with almost no bass (but a very clear, clean, and fun signature through the rest of the spectrum, very forward sounding). I mean, I love the way it sounds, but I was completely missing the lowest octave of the frequency spectrum and the second octave was pretty weak, which is why I got the M5 to supplement them (which I have since returned for being unlistenable).
Originally Posted by cyberden
Edit : I tried to sealed the front facing pinholes again to try and I find the M5 VERY bass heavy like that. As already mentioned, the sound is definitely not as clear as when the holes are opened.
While I was playing around with the M5, I figured out how messing with the ports changes a bunch of the resonant peaks within the case. Front port sealed meant much more bass, but much more nasty 4-5 kHz shrillness. Rear port open meant much more bass as well, but also huge bloat in the midbass to lower-mid region. The fact that I couldn't get the shrillness to go away no matter what I did led me to believe mine were defective beyond how the ports were set up.
Originally Posted by jonmp
Hi, I feel the same with my M5. They are weirdly harsh around the 5KHz band. I can fix it partially with the EQ on my Cowon i9, reducing the 4.1KHz band, but overall I'm quite disappointed with these ones (I had got previously some Soundmagic PL50 and by reading the reviews of Clieos and Joker I expected a big improvement SQ wise).
At first, listening the samples in that link provided by zephyr90 I thought that commented reversed polarity could be the problem, but later I've listened the same samples with other earphones and they sound the same as my Brainwavz...
Have anyone finally got a replacement from mp4nation?
Yeah, that sounds a lot like mine. I would also like to know if there are better recent manufacture examples out there than what we got.
I'm also starting to wonder if it's just a peculiarity of my ears, though... out of all the IEMs I've tried, some have it worse than others, but the MH1C is the only one that didn't have any audible resonant peak in that area. The worst offenders were the M5 and the JVC HA-FX3X (the latter is painful, even after trying to burn it in... it's about to be returned). The TDK MT-300 has one too (although I could move the peak higher or lower in pitch and amplitude by changing tips). The R1 has one, but it's not as bad, and the M2 sounds to me like it's more broadly EQed slightly up in that area but doesn't have that icepick-in-the-ear sound.