LetShuoer DZ4 Review

The DZ4 is a triple dynamic driver IEM from LetShuoer that throws in a passive radiator into the mix for a 4th "driver". Passive radiators are typically used with small desktop speakers to provide more punch and low-end bass when the physics of a small speaker driver won't allow such. These passive radiators are another speaker, but without a voice coil or magnet, and use the trapped air within the enclosure to resonate and create sound -- typically on the lower end of the spectrum.

How does this interesting driver choice add to an IEM? LetShuoer wants to let us try it out in this DZ4 IEM, priced at $89. This was sent to me directly from the company for review.

The DZ4 comes in a small box and includes a standard LetShuoer zippered carrying case, a series of ear tips, and a very nice looking cable that alternates in a gray/brown color pattern. It's a 4-wire braided set that I think looks and feels quite good. The cable terminates in 2-pin connectors and a 3.5mm plug.

The shell is an aluminum alloy face-plate and a 3D resin printed shell that is very, very light. It has some sort of textured coating on it that is in a cream color that feels soft and slightly rough. The faceplate has an orange Z opening that has a perforated filter behind it. The overall shape and size is fairly small, and I found the DZ4 extremely comfortable to wear.

The three dynamic drivers are individual 6mm titanium dome drivers and the passive radiator is also 6mm. The overall impedance is 12 ohm with a sensitivity rating of 104 DB, making it fairly easy to drive with any source.

Sound Impressions

The LetShuoer DZ4 has a U-shaped balanced sound signature that has a slightly elevated bass range and a smooth and slightly dark treble range. Measurement speaking, it comes very close to my latest "V4 Target Curve" based on my IEC-711 coupler.

While the DZ4 is not the most technical IEM I've heard, it is very well tuned in my opinion. I found some occasional times where the treble range sounded a little strange, but it was very rare. The tuning is quite nice and there's a nice smoothness to the sound that makes it very easy to listen to for long periods of time.

For being a triple-dynamic driver with a passive radiator, I was expecting the DZ4 to be basshead IEM with big booming bass. It really is not, and those who expected such will probably be very disappointed. The bass levels are just north of neutral, and do have some punch and slam, but it does not overwhelm the sound, nor does it sound like it's extra dynamic in the wow factor either. It just sounds almost too boring in some cases, but sounds accurate.

The imaging is quite solid on the DZ4, and it also present sound with a medium-sized "IEM" soundstage. I quote this because IEMs are just not big in soundstage department, generally speaking, but for an IEM, I'd say it's average. The depth is not muddled and closed-in, so there is room for music to breathe and flow, which is something I am in favor of.

In an overall sense, the DZ4 is a solid and well-tuned IEM. For the price, I do find it quite a good value at $89, and beats most of its competition for this price point especially considering the useful and tasteful carrying case, very well designed cable, and the lightweight and attractive looks.