August EP 636

I based on the purchase of this helmet on the analysis of "Manu DELGOFFE" Manu "(Luxembourg)"
I quote -
Audio test Summary:
Rendering is generally very good, with bass present without being invasive and crisp highs and not too garish.
The weakness rather come mediums which are indented. The voices are therefore somewhat muffled / remote from the rest.
Compared to the 635, the sound is very similar but lacks a bit of roundness. The sound insulation is less perhaps?

Methodology and audio test result:
I simply listened to songs I know by heart and gave them a note. I took as base maximum (10/10), the sound from Sennheiser HD-650 (300 euros)
London Grammar - Night Call: 8/10
Audiobook: 6/10 (worries mediums)
Shaka Ponk - Lucky Boy: 8/10
Diablo Swing Orchestra - Balrog Boogie: 8/10
Soundscape playing on Diablo2: 8/10

My experience on various type of music "Rock, Classical, Opera, variety" are excellent.
I recommend are given price and its features.