ROCK Mula (RAU0511)

ø9mm Dynamic Driver


After the swift success of Zircon, ROCK has released the cheaper Mula. Even though the build quality is quite similar to Zircon overall, the implementation was poor, because the replaced a beautiful metallic remote with a plastic one, and stuffed the cable inside a small package, which resulted in irreversible bends along the cable.

As for the sound quality, there's barely any room for comparison. The sound is much simpler, condensed and just plain. The bass is weak and lacks any impact. The highs are quite good but the mids sound slightly inaccurate.

The quality assurance of Mula is also much worse than Zircon's, since both Mula pairs I got were defective (the other pair which I scrapped right away was extremely disbalanced), while the drivers of both Zircon pairs I ordered were perfectly matched.


  • A pretty flat sound signature - for those who enjoy it.
  • A great build quality.


  • The sound quality is nothing spectacular. The bass is lacking badly and the mids sound just not right.
  • You'll need to think of a safe method to straighten the cable, because it's bent badly because of the way it was stuffed inside the package.

Package & Accessories


Soft paperboard + soft plastic (clear)

Ear Tips - Single-Flange:

S+M+L, grey (translucent), ø5mm black bores

Build & Materials


Metal, ø5mm nozzles, stiff strain reliefs


Plastic (glossy), single-button


Metal, soft strain reliefs


Fabric + TPE, 120cm, extra-soft, bend-retaining*


Metal, straight, short, soft strain relief

  • Although it's the same cable as used with ROCK Zircon, it was stuffed in such a tight manner inside the much smaller package that it became completely deformed.

Comfort & Fit

The included tips look almost like Zircon's tips, but they are different, and less grippy too.

Lows / Bass

There is some noticeable mid-bass that complements the mids, but nothing below it. The lows are weak and are not pleasant at all as they tent to be distorted most of the time.

Mids / Vocals

The mids aren't bad, they just aren't accurate enough. The tone of vocals isn't spot-on and they are slightly exaggerated and harsh. Sometimes it sounds as if the singer sings directly into your ear. Not very comfortable.

Highs / Treble

The highs are OK, nothing more. They are actually on the darker side and there isn't enough detail to make the sound pleasing.

Frequency Response

Published on 2016-01-16 21:57:07 (GMT)
Mubow Mucu
MuO Obsidian Y5 Zircon Zircon Sport