Closer Examination

The cable LETSHUOER includes with the EJ07M is a good example of keeping it simple and doing it well. We get a high-purity (99.9999%) OCC copper conductor cable inside a transparent nylon braid sheath starting with either a 3.5 mm TRS single-ended or 4.4 mm balanced TRRS connector plug off a right-angled housing for improved cable management from the source. I do wish LETSHUOER had implemented some form of modular plug cable for 2.5/3.5/4.4 mm options from a single cable, which would be more in line with premium IEMs in 2021/22, but that's really the only complaint I have from an otherwise pliable, non-microphonic cable that doesn't kink easily either. The housings are either clear plastic or aluminium, with an expected cable splitter and cinch partway through the length of the cable. The use of two thicker strands in total, one per channel, makes it easy to avoid microphonics, and we see translucent plastic sheathing on top of the nylon closer to the other end for better memory wire formation with the ear hooks. The cable terminates in two 0.78 mm 2-pin connectors, again in a clear enclosure that is angled and with blue/red L/R markings indicating the left and right channels respectively. All metal plugs and connectors are gold-plated for added oxidation resistance.


What makes the EJ07M somewhat unique even to the extremely small world of tribrid IEMs is the use of a metal shell as opposed to resin. It is also on the smaller side of average for tribrids, which is good news for comfort, and build quality and longevity. LETSHUOER is using CNC-machined aviation-grade aluminium alloy for the shells, which gets a silver or black anodization based on the two available designs for the universal IEM (UIEM) option of the EJ07M. I have the former here, paired with a CNC-machined piece of G-10 high-pressure fiberglass laminate with swirls in various colors. It's a one-off each time, so even the two face plates don't match up exactly. The other option goes for a carbon fiber and gold speck assembly under an acrylic cover, which makes for a stealthier look combined with the black shells.


We now take a closer look at the two face plates, and note there is no blue on the right one, for example. So if you get pedantic about matching face plates, maybe stick with the other option or go the CIEM route and work with LETSHUOER to make a custom design and fit matching your needs and tastes. These also feel like open-pore wood, which is the point, I suppose. The application of the face plate and gluing of the shell parts could be done better, as running my nail across spots easily has it catch on interfaces. Note the lack of any visible branding since LETSHUOER is confident the product speaks for itself. Presumably serial numbers, these are etched into the side along with L/R markings, and we also see a vent with a mesh underneath for airflow to the acoustic chamber. The shell design is fairly ergonomic and does not have any aggressive lips or notches that fix into the antihelix of the ear concha, which is more good news for those with smaller ears. A look from the side reveals the inset 2-pin connector housing the cable connectors plug into, as well as the nozzle of the shell construction, which ends up on the larger side of average with a diameter of ~6.3 mm at the widest spot and ~6 mm elsewhere. There is a retaining lip at the end to better secure the ear tips in place, though it is quite small over the base nozzle itself. A mesh filter at the nozzle opening prevents contaminants from entering the acoustic chamber.


These are the three types of ear tips included with the LETSHUOER EJ07M, in size M and installed on the same IEM. These are all quite easily installed, with the memory foam tips coming closest to being a challenge owing to the thicker nozzle. The two silicone types differ mostly in the rigidity of the outer flange, with the actual form factor very similar in terms of nozzle opening and ear tip length and diameter. Do try out the different options to get the best-possible fit, and consider tip-rolling if these don't seal well enough for you.


Regardless of which tips you go with, the next step is to connect the cable by carefully identifying the matching channels and orienting the ear hooks to go around your ear naturally when connected to the IEMs. Doing so is extremely simple since you just push the male ends into the female ones on the IEMs, and I realized at this point that the two pins are longer than average. They still fit in just fine, and aftermarket cables had no issues, either. Now simply connect to the source using the right-angled 3.5 mm TRS connector on the other end of the cable, assuming you went with the same cable as mine, or get a source with a 4.4 mm output, such as the iFi GO blu (or use adapters) if with the other cable option. I know there are many who prefer using IEMs throughout, but I like to use over-ear headphones when sitting down and IEMs on the go. I paired the LETSHUOER EJ07M with all the tested portable DAC/amps to date and personally like the cleaner profile and handy EQ options of the Qudelix-5K as the source, in turn paired to my phone or laptop.