Hey, I had a question re: vents, and you seem to know what you’re talking about!
I bought some z5000s and get uncomfortable ear pressure issues with them. It doesn’t look like they have a front vent at all. Do you think if I drilled a front vent it might help alleviate this? (I understand I also might totally break them, but I don’t use them at all as is, so I’m game to experiment).
Yes, it is possible - I've done it to a few IEMs. However, it is a very difficult mod unless you are experienced, extremely careful, and have the correct drill bits.
On a difficulty scale from 1-10, where changing ear tips is a 1 and building your own headphone from scratch (Magyver-style using materials you have laying around) is a 10, I would rate it at an 8.
I mean sure, what's so hard about drilling 1 hole, right? Well, the trick is knowing exactly where to drill it, what the optimal size hole needs to be, and drilling it using a technique that does not allow even a single shaving to fall inside (which is a feat all on it's own).
If you drill it too large, it will kill
all bass. If you drill it too small it won't be effective. The hole I'm talking about will be a few tenths of a millimeter (usually 0.2mm is a good size, or the average diameter of a single human hair). Drill it in the wrong spot or at the wrong angle, your driver is toast. Also be aware that any hole you drill, no matter what size, will reduce bass to varying degrees (and the awesome bass is the Z5000's biggest strength).
Also, the ZhiYin Z5000 is stainless steel, not aluminum or plastic. Aluminum and plastic is soft and can be drilled much easier. Stainless steel is quite tough, and requires high quality precision drill bits (cobalt, HSS, or carbide-tipped drill bits).
Something else you may consider as an alternative is to use foam tips. They are much more forgiving of pressure on insertion, because they give air pressure a chance to equalize while the foam is expanding into place. The tips you want to look for are "slow rebound tips", which will allow for the most time.
Depending on what you decide to do, I have been wanting a pair of Z5000 for a while now. If you decide not to risk drilling them or using foam tips, and would rather sell/trade them, hit me up on PM.