The midrange provides excellent detail and a good weight to vocals and instruments. The texture is excellent, offering bass that doesn’t just hit hard, it also provides a clear tight presentation. In the low-end, you get a strong emphasis, with deep extension, and just enough extra midbass to push things towards “basshead” territory. However, U4s sets itself apart from the pack, particularly in the quality of the bass delivery and the excellent air and resolution in the upper treble. With just a little more bass than the U12t, the tuning is very close to the Harman-esque “bass boosted neutral” that has become one of the most popular IEM tunings as of late. My first impression of U4s was that it had a character similar to the U12t, but with the benefit of dynamic driver bass. In addition to their sonic impact, the Apex Modules also help reduce fatigue by venting the sound, and give you options as to how much air (and subsequently noise) you wanted vented. You should be able to find a solid fit with the included SpinFit, wide-bore silicone, and foam eartips (though I could have probably gone for an XL in the wide-bore). In terms of using U4s, it’s lightweight and provides a very easy fit. We’ll talk more about the practical impacts of those in just a minute. U4s has the m15 module installed out of the box, and includes the more open mX, and tighter, more closed m20 module. Apex Modules provide varying levels of venting for the IEMs which in turn impacts the tuning, particularly in the bass and soundstage. The box is pretty standard, and you’ll find the IEMs, 3.5mm cable, case, eartips, cleaning tool, and shirt clip inside, along with 64 Audio’s Apex Modules. This means you get the same sort of comfort and durability you expect from 64 Audio, with that extra touch of visual flair. The overall design is similar to the U6t, Nio, and Fourte, which all have the same basic visual template, with different colors and patterns. U4s sticks to 64 Audio’s classic anodized aluminum for the majority of the shell, and it has a dark gray pearloid decoration on the faceplate. Does U4s deliver the level of quality we’ve come to expect from 64 Audio at $1099? Build and Design U4s is no different, taking the 4-driver hybrid design of the A4s, putting it into a universal shell, and hitting at their lowest price yet for a universal IEM. Most of their universal IEM line-up started as custom-only IEMs designed for musicians, and eventually transitioned into a universal model.
64 Audio is probably best known for the way that they craft tunings that meet the needs of musicians – both on stage and in the studio – and give audiophiles the blend of musicality and detail that they crave.
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