Mionix's Nash 20 is a surprising performer when it comes to sound. It's a gaming headset built from scratch and manages to actually sound good, not fantastic, but good. Who would have thunk it? Bass, Mids, and treble, they all get a proper stage to show off, each nicely extended, and neither overbearing. It sounds better than SteelSeries Siberia V3, Corsair Vengeance 2100, and ASUS Strix Pro, and even manages to give HyperX's Cloud a run for its money, and that one is an altered / rebranded Takstar Pro 80 monitor.
The bass is slightly accentuated, though it doesn't become boomy or overbearing. It has some impressive speed and punch to it, and can keep up with fast agressive drumming like Brianstorm.
The upper-end of the bass is slightly ramped up, whilst the sub-bass rumble seems to not get as much attention.
The bass transitions nicely into mids, and the lower-mids get the same bump as the upper-end of the bass. This is great for male voice, adding presence, but not so much for instrumentals. Since the upper-mids are dry and even somewhat cold, there's less musicality for instruments like pianos, or cellos.
Treble is great compared to other gaming headsets, having a nice amount of sparkle and extension. It sounds better than most gaming headsets, though at times it still ends up being drowned out by the upper-bass & lower-mids.
Soundstage & Imaging
Mionix advertises Nash 20 as a semi open-back headset, and that's something you notice while listening to them. The headset features nice a fairly wide and deep soundstage, with proper imaging and spatial positioning.
Sure, the stage doesn't come close to something like Sennheiser HD600, or even the closed-back SoundMAGIC HP150 / Sony MDR1-A, but those are almost three-times the cost.
The uni-directional microphone is nothing short of fantastic. This is by far the best mic I tried on a gaming headset, and it manages to pick-up the voice accurately, with little to no distorsion. It doesn't pick up any background noise, and even the tack, tack, tack of a mechanical keyboard is (mostly) snuffed out. However, it does seem to have a noticeable hiss, not necessarily a deal-breaker, but something that isn't there with other offerings.
As for gaming, That amp in the bass upper-end works in favor of games. Playing something like Battlefield 4 and you get a very satisfying kick to each fire shot, and explosions have that visceral punch to them. The added clarity also helps with picking up the finer details like footsteps and distant movement, and considering the stereo imaging and soundstage, you could rely on sound to pick-up enemies.
Since mids also benefit from the ramp, voices, especially in dialogue heavy games seem to sound a bit more dramatic, and while that is not necessarily a plus, it was a funny thing to notice.