Posting this here for anyone who might be interested in starting a DIY earbud project:
"What I learnt after building 5 earbuds"
1. Pre-tin your solder tips!
2. Solder flux helps A LOT
3. To unsolder cables from drivers, wet the solder tip with a tiny amount of molten tin first, then make contact with the solder pad
4. The sound of the earbud shell and cover stuck together by tape (was doing this for ease of re-tuning) vs actually snapped together is mighty different (snapping together significantly reduces mid-bass and increases treble)
5. PK shells are much more tricky to work with vs MX500 shells. My PK shells (from DIY Earphone Tribe Store) came with holes so tiny, my cables could not go through (had to enlarge using a tiny strip of sandpaper). In contrast, MX500 shells were usable straight out of the bag
6. That said, the comfort of PK shells is unbeatable
7. Tuning foam: the thicker it is, the more accentuated mids and highs will be
8. Shell vent holes: more holes = more mid bass, less extended highs
9. Full foams: tames highs, adds more mid-bass
10. Donut foams: adds more mid-bass with negligible effect on highs, but slightly pushes mids back
11. The following are some impressions comparative to some of the more popular earbuds:
DIY drivers I have tried | Impressions (based on my opinion) |
"DIY EMX500 earphone Speaker 15.4mm speaker HiFi Bass Sound quality Speaker unit MX500 Earphone accessories" from JieTu | Stock sound (with stock tuning foam) has too extended treble. Exposing 1 round vent hole tames it, bringing the overall signature closer to RY4S UE but with slightly more mid-bass |
"2pcs 15.4mm 32 ohm Low Frequency Headphone Driver Speakers with Shell Case N50 Magnetic Flat Headphone DIY for MX500" from NSC | Stock sound (with stock tuning foam) has too extended treble. Fixable with full Hiegi foams. Resulting treble extension similar to RY4S UE, but mids more recessed and less sub-bass. |
"Headphone DIY 15.4mm Speaker Unit 32 Ohm Heavy Bass Headphone Loudspeakers DIY 98.5db" from NSC Audio Store | Stock sound (with stock tuning foam) has very extended treble. Fixed with exposing 1 round vent hole + full Hiegi foam. Resulting treble slightly more than RY4S, and significantly more recessed mids (but not as recessed as Qian 69). Mid-bass: more than RY4S but less than Qian 69. Sub-bass: less than RY4S, but more than Qian 69. |
"14.8MM speaker unit 32ohms pk1 red film 2pcs" from DIY Earphone Tribe Store | Stock sound had very little bass. Exposed both vent slots to try to increase bass response, resulting in mid-bass similar to Qian 69 but less sub-bass. Mids are much more forward than Qian 69 but not as forward as RY4S. Treble is less extended than Qian 69. |
"orinigal SR PRO unit YUIN SR earphone speaker unit white 16 ohms 1pair=2pcs" from Chitty's Store | Stock sound treble too rolled-off and mids too recessed. Fixed this with blocking off the top vent slot. Resulting treble extension still less extended than Qian 69, but blocking more vents affected bass too much so I left it at that. Mids much more forward than Qian 69 but less forward than RY4S. More mid-bass than Qian 69 but slightly less sub-bass. |
Special off-the-shelf earbud mention (due to its peculiarity): MEMT T5 | Sound signature is very very fit dependant. Mids sound very very recessed initially (when I was wearing it all wrong), but after angling the front vents to point more directly into my earholes (almost wearing it like an IEM), the overall sound signature is actually pretty decent (relatively neutral with mid-bass focus). Fixed it a bit more by blocking 75% of the vent slot with a tiny piece of earbud foam.
Resulting sound: treble extension still less than Qian 69, but mids comparatively forward with more mid-bass and sub-bass than Qian 69. |
Hope this helps as a guide for anyone starting out!