I reached 1K post (
) and for that occasion I decided to post a few pictures of my favorite pair Superlux HD381. I already own whole set of 3 pairs: HD381 (black), HD381F (white), HD381B (gray) and one spare black pair.
For some time now I have been thinking about opening a spare pair and investigating what is happening under the hood, but in the meantime I came across a damaged HD381F, which I'm presenting today.
BTW a brief description of this model can be found
here.
NOTE: Ignore the current condition. This is a desperate attempt by the previous owner to fix this buds
What is so special about this lineup? Well ...these buds use 13.5mm and as you can see in the picture the size of the shell cavity is very small.
From previous experience with the MX500 and such a small depth of shell, the sound is generally less spacious and closed, which is not the case with this model at all. What's more, the sound here is so open that it surpasses the IEMs and earbuds
and can be directly compared to open-back headphones. Also, you can see a small hole on the underside which is the only vent on the whole shell.
For me personally, this is the best tuned 13.5mm driver (16ohm) that I ever heard. All frequencies are fairly clearly defined, no sharp peaks and each of these models has its own specially tuned sound signature.
Comfort wise these buds are ultra light, the rubber ring improves comfort drastically and at the same time serves to hide the connection between cover and shell. The nozzle is very short and not cause any pressure or discomfort.
Also, it helps a lot with bass separation from mids. The reason why I don'y call it IEM is because openings on the lid that let sound like a classic earbud. They use some kind of textile as a filter.
The inside of the shell not use is simple, they added some kind of the rubber to block the sound to go in the back part of the shell. Of course, glue is inevitable
And finally we see a bit different driver construction. than to what we are used to with 14.8mm and 15.4mm drivers
Side vents not exist but only huge center vent covered with some kin of the canvas. Obviously, drivers designed in this way do not require a large shell space to function properly.