JB Systems Movil-1

I am looking for a small battery stereo. Battery mixer, battery RF receiver for micro.
Micro 1m in front of the speakers and playback.
I started with Rockster go - too quiet,
Then 2 Rockster cross - nice small volume at about 80 db. - Bass did not go low enough, low frequency 65Hz came as loud as the high frequencies.
Size was appealing, suitable for sustained train travel.
Bose S1 came on 91 db the 65 Hz frequencywar only half as leut as the high frequencies.
Now I had hope that they got the price wrong at JB Systems.
The low frequencies were in the same volume as the high frequencies. It reached 85 db without da Micro feedback, would have been too nice now,
if the sound had not muffled now. Since the Rockster Cross came across better with 1/4 weight and size.
Who does not have to put on the sound pressure value, has here certainly a cheap but large and heavy solution. 2 Rockster currently cost 700 euros.
One finds but also no tests or evaluation on the Internet.
So for me it is nothing. I have long considered whether I do not keep them at the price, but I know me, at some point you get annoyed with the Mumpf.
Maybe the things are just not in order and it is due to the strong noise floor, so if nothing is plugged.
Someone from the technical staff could write something about it.