Was it difficult to open their shells?
No it wasn't, but it's always pretty unnerving when you replace the face of it,
But it sounds a lot better then the 120ohm.
Although the best are my 130ohm and 400ohm, I have made a couple variations with those 2 and both are hands down the best in my collection
1. 400ohm (all around/slightly laid back/great sub bass dark)
2. 130ohm(best detail retriever, great sub bass, bright)
3. 500ohm(very good sub bass, bass mids and highs, fairly neutral)
4. 64ohm composite (sub bass monsters, definitely bass head approved, dark fun)
5. 200 ohm salvaged from to200 (good bass, sub bass, very balanced nice highs, bright)
6. 68ohm (mid centric, decent highs, really good vocals, dry bass, bright)
7. The whole 19-21 series is really great, cheap, fun v shaped sound, bright and bassy)
I never could get a great tuning out of the 600, it was great from the sellers, straight in the mx500 shells, but any of my other builds leave it in the dust.
The 300ohm aren't very special.
The 120ohm 14.8mm is just too dark
120ohm monk light is fairly surprising, I tuned it a bit dark, but it sounds surprisingly spacious, but the timber is a bit funny on it.