You can easily get the impression that the D4 will sound similar (if not even identical), to the previously reviewed D3, given the similar specs. That, however, is far from the truth. These earphones have very little in common. The D4 is cheaper, and it really shows. From the inferior build quality, up to the darkish and inaccurate sound quality, these earphones offer no competition to D3.
The most accurate analogy would be: a cheaper version of VJJB N1 - an emphasized mid-bass and underwhelming treble, leaving a rather thick, dark and veiled sound.
NOTE: For this review, I got the D4C model. While D4 has a single-button inline remote, D4C has a triple-button one.
Extremely comfortable to wear, with the appropriate ear tips.
Although not as sturdy as D3, the build quality is still excellent for the price, and the cable will most likely remain flexible even in cold temperature.
An eye-catching housing design.
The treble quality (or lack thereof) isn't worth your time or money.
Boomy bass response with a noticeable mid-bass bloat.
Package & Accessories
Hard paperboard + soft paperboard + soft plastic (clear)
Ear Tips - Single-Flange:
S+M+L, black, ?6mm bores
Build & Materials
Plastic (glossy), ?6mm nozzles (?5mm bores), no strain reliefs
Plastic (matte), triple-button*
Metal, stiff strain relief
Silicone-coated (grippy), 121cm, soft, straight
Metal, straight, short, stiff strain relief
The volume buttons work on Android devices. I don't have an iPhone for compatibility check.
Comfort & Fit
Very comfortable earphones. The shape of the housings and the included wide-bore ear tips made it very easy to get a firm hold and seal. The included ear tips are simple, but do the job perfectly thanks to their extra-wide bores.
Lows / Bass
The lows are extended, but don't sound very stable. The sub-bass is reproduced, but sounds struggling not to distort. Kick drums and snare drums sound more impactful than usual, but are also dry and unsatisfying. Definitely a mixed bag, and not on par with what I would call a "high quality bass".
Mids / Vocals
The mids are average or just about below average. They are present and mostly upfront, but tonally inaccurate and darkish. A lot of the issues with the mids are a result of a significant lack of treble and a bloat of lower-mids. Male vocals are a bit bassier than they should be, but apart from that, the mids are listenable, although not enjoyable.
Highs / Treble
Nothing to write home about, really. The treble is quite veiled and a lot of detail is missing. It's distant and tonally dark, but not the worst you can get at this price point.