- well thought-out concept
- App variety from Android
- Very high volume
- Flat and handy design
Despite its low price, the JM21 proved to be very mature when tested. FiO's extensive experience with HiRes portables obviously plays a role here. The flat, handy housing is very appealing, and thanks to Android and access to the PlayStore, the equipment is superb. The great sound and high output power make the JM21 interesting not only for travelling, but also for use at home as a mobile headphone...