Loudspeakers for demanding music - classical music

I was looking for a portable speaker (approximately 500g) for demanding music, that is a speaker of the clear sounds both in the heights, as well as clean basses. For Höhenn I chose a music video with the world-renowned sopranos Rene Flemming and Anja Harteros I grossed over my Ipad Mini II via Bluetooth.
From my music library I chose a polyphonic piece by Bach ("Rejoice ..." from demWeihnachtsoratorium I), which I grossed about EQu App. The speaker should achieve at least low volume, so about 10 people can hear him well. Alternatively, I also tested the Bluetooth pairing with my three year old Android Smartphome (HTC).

The speakers on the size and weight listed:

JBL batch I (450g)
+ Votes: balanced and round
+ Orchestral instruments: to differentiate good
+ Volume, spatial sound
+ Blueetooth: Pairing with no problem
+ Charging function for external device

Ultimate Ears UE Boom (540g)
- High voices sound scratchy
+ Orchestral instruments sound balanced
+ Volume
+/- Bluetooth: Pairing not possible with older Android (HTC)
- No Ladefunkion for third-party device

JBL batch II (600g)
o High voices sound sharp
To differentiate + orchestral instruments well, high dynamics
+ Volume
+ Bluetooth: Pairing with no problems
+ Charging function for external device

Bose SoundLink Mini (650g)
o / + voice slightly thinner than the JBL Charge I
o / + orchestra will vote against something too pronounced
o volume quickly reach their limits
+ Bluetooth: Pairing with no problems
o No charging function for external device

Actually only comes the JBL batch (I) in question, it sounds very balanced and has a spacious sound. The Sony SRS X 3, I've been testing in a market that is not an option for me. An absolute recommendation is the app EQu the iPad. There I had to readjust the ability to raise and lower the height eg at low volume, the bass.