Pros: • Deep and physical subbass • Bassy but not a full-on basshead tuning • Good bass texture and note weight • Vivid and natural-sounding mids • Energetic upper mids and treble • Good treble extension and air • Compact and comfortable resin shell • Premium-looking faceplate • Excellent stock cable Cons: • Bass isn't the tightest or most controlled • Upper frequencies can become borderline fatiguing on certain recordings The ISN H20 is actually my first ISN IEM, so I was genuinely looking forward to spending some time with it when I found out Penon was sending me a unit. I've had quite a few Penon products pass through my hands, but for some reason I never got around to trying one of ISN's IEMs until now. After spending quite a bit of time listening to the H20, I can say that this is definitely not an IEM trying to be neutral or reference-flat. The H20 has a very obvious personality. It is bassy, energetic, vivid and quite musical, with a presentation that puts the ...