Google translation of the review summary:

Conclusion (4/5)
With the S1 Pro, Bose closes the gap between their consumer series and the PA line. The shoe box-sized box is equipped with a three-channel mixer including Bluetooth, ToneMatch, Reverb, EQ and Spatial Dispersion and weighs just seven kilograms. The optional battery makes the box independent of the power outlet and you are free in the choice of the venue. The volume is sufficient for 25 party people or 40 attentive listeners, the sound automatically following the four setup options. The sound is always good and full, as usual with Bose. For 589 euros (without battery), the box as a handy, transportable sound solution for singer / songwriter and speaker and limited as a small DJ system. You should not expect subbasses, however, with contemporary dance music the S1 Pro has its problems. Nevertheless, I find the overall package very convincing and give the system 4 stars.

PRO
light, very handy box
excellent resolution of the sound
automatic master EQ for four applications
Three channel mixer
ToneMatch presets for Micro & Hi-Z
Reverb (Channel 1 & 2)
feedback-resistant
optional battery
CONTRA
Bass flutters with dance music
Volume control shows delayed reaction
Hi-Z slices
difficult to estimate residual charge of the battery