|Driver Unit||Custom Tuned Single Dynamic Drivers|
|Sensitivity||92dB+/-3dB at 1kHz|
|Frequency Response||20Hz – 20kHz|
|Rated Power Input||1mW|
|Max. Input Power||5mW|
|Plug||3.5mm Gold Plated|
I tested the M4 after 100 hours of burn in.
I used the Opus#1 Dap in my listening, FLAC tracks.
The Advanced M4 is a sub $100 earphone which comes across as an airy and pleasant earphone, has enough bass to satisfy. It can go quite deep on some tracks.
The sound stage is medium, which seems larger due to the highs and the exquisite instrument separation.
Vocals are centered within the front of ones skull and are generally smooth and well defined.
Good height, medium width.
Still confused as to why the frequency charts are so different.
At around US$40 -$100 ($40 0n their website) the M4 comes in at the sub $100 bracket.
Many earphones of varying quality reside within this price range.
It seems of good value with a clear sound, good detail and a wide range.