I posted a thread on a UK hifi site I frequent on fitting this board, maybe answer some questions.
To answer your questions directly though:
**It’s not clear from the photo, but is that black piece an HDMI port?**
If its the one on the PCB then no, its unused, HDMI port is on the back.
**Did you cut out the back of the 103, per the seller’s photo?**
Yes (Used a Dremel to cut gap to fit board)
**Anything else to know about fitting the board, such as how easily it attaches to the 203’s chassis - or does it attach to the back and sit in the air?**
Has 2 mounting points wither side of back of card, which connect through venting slots in back of Oppo and lock card to back panel.
(Mounting screws didn’t come with it, M3 machine screws work perfectly)
**What coax were you using, i.e., for sound comparison?**
Black Cat Silverstar 75 designed by Chris Sommovigo.
The i2s board sounds better, particularly on disk playback.
Streamed sound quality is “different not better” than Roon feeding the DS’s Bridge 2 (Though the card’s sound is changing with some hours on it - I’ll reserve judgement on that for now)
**To get a better sense of your comparison, what else is in your system, components and cables?**
My System: (slightly changed since this picture)
300B SET power amp 8watts per channel output
Densen DM20 preamp
Bespoke British speaker build 94DB efficiency
Directstream Dac with Bridge II
Oppo 203 (heavily modded, inc. internal linear psu)
Morrow Audio MA5I/C and SP7 speaker cable, PAudio AC5 power cords.
A transparent revealing system I feel, able to tell differences quite easy?
Its fed by a balanced mains power supply, so the system has a lot of stuff batting for it.
**How did you contact JH Lee? Don’t see any contact info in English.**
Yes, by email on: email@example.com
Hope this maybe helps.
A couple of days on the Oppomod board and its sounding terrific.
A real sense of life about the music compared to coax from the same player.