“[…] The Teufel Rockster Air is more like a small PA system rather than an ordinary Bluetooth speaker. The rather massive and somewhat coarser look of the Rockster Air fits well with this. […] It's also possible to combine two Rockster Airs for an even 'bigger' sound."
"[…] At normal, house-party-suitable volumes the bass is clearly the primary sound element. No surprise, because the Rockster Air is equipped with a 25cm subwoofer […]. The bass can be adjusted to your own requirements with the aid of an equaliser. […] there's nothing wrong with the bass! It is deep, strong and of high quality. If you really want to get the party going, you will enjoy the Rockster Air. […] Due to the extremely good and deep basses as well as the high treble, the Rockster Air offers a subjectively very high dynamics and liveliness. If you will, the Teufel Rockster Air is fun and that's a lot of fun!"
“Do you organise regular parties outdoors or in your house and are looking for a semi-portable/professional active Bluetooth speaker? Then the Teufel Rockster Air is of the right caliber! This one is loud, bass strong and generally just powerful! With a maximum power output of 112dB, the Rockster can easily create volumes that are simply unpleasant in smaller rooms, which is a compliment in this case. […]. […] the battery [can] really last quite a long time [...]. According to Teufel, at quiet volumes a battery life of up to 30 hours is possible, and at party-suitable volumes you can still get double-digit values. In addition, there is a large variety of connections, which allows the connection and mixing of instruments, microphones and other devices which use 3.5mm. Plus, of course, Bluetooth. […] If you match the profile of the right user of the Teufel Rockster Air, then there is no argument against the purchase! The Rockster Air is fun!"
(Translated from German)