SteelSeries Flux In Ear Pro Earphone - Black
Specs: Driver: BA | Imp: 26Ω | Sens: 105 dB | Freq: 20-20k Hz | Cable: 4′ L-plug
Nozzle Size: 3.5mm | Preferred tips: stock single-flanges
Wear Style: Over-the-ear
Accessories (4.5/5) – Single-flange silicone tips (3 sizes), Comply foam tips, proprietary PC adapter, proprietary smartphone adapter/connector, cable guides, and semi-rigid zippered carrying case
Build Quality (4/5) – The plastic shells of the Flux In-Ear Pro look like a combination of the Phonak PFE and Brainwavz M3 designs. Above the y-split, the cable is of average thickness and features an inline microphone and single-button remote. Below the y-split, the cable is thick and flat, terminating in a proprietary 8-pin connector. From there, one of two included terminations can be used – a 4-pole L-plug form smartphones and other portable devices, or separate microphone and stereo audio plugs for use with a PC
Isolation (3/5) – Average for an armature-based set
Microphonics (4/5) – Good with over-the-ear wear, average otherwise
Comfort (4.5/5) – The fit of the Flux In-Ear Pro reminds me of Phonak’s defunct “Perfect Fit” earphones, which remains one of the most comfortable in-ears I’ve tried to date. The Flux Pro is a little larger but otherwise fits similarly. Though advertised as wearable either cable-up or cable-down, the earphone requires the channels to be swapped for comfortable cable-down wear
Sound (8.5/10) – The SteelSeries Flux In-Ear Pro is the company’s higher-end in-ear offering and is priced similarly to a number of other balanced armature earphones on the market. Overall, it is a good performer – well-balanced, with good bass depth and smooth, gentle treble. Bass extension and impact are rather impressive for a single BA – punch is about on-par with the HiFiMan RE-400 and MEElectronics A161P, though not quite as tight, and on bass-heavy tracks the low end definitely hits harder than one might expect from a single armature, exhibiting good depth and rumble.
The midrange of the Flux In-Ear Pro is nice and prominent – a little less clear compared to the Etymotic Research HF5 and HiFiMan RE-400, but still good. It is smooth and not overly prominent, with a slightly warm tone and no discernible grain. At the top, the Flux Pro is again smooth and refined – more so, for example, than the MEElec A161P. It sounds a bit duller than the MEElecs but the more forgiving treble presentation is likely worth the lack of energy for many listeners.
The presentation of the Flux In-Ear Pro is highly reminiscent of the Ultimate Ears 600. It boasts good width but only average depth and layering, especially when compared to higher-end sets. While wide, the soundstage of the Flux Pro is not as airy as that of the HiFiMan RE-400, for example. The less expensive Flux model, too, occasionally has the upper hand when it comes to soundstage depth and dynamics.