Perfect Concrete Enclosure

Ultimate non resonating concrete enclosure without any parasitic resonances does not distort the true sound of speakers.


Its sound challenges much larger and complicated audio systems while keeping small dimensions.


The all-active system has everything already within, you just connect your device and listen.

Enjoy, just listen.

If interested in a visit of Gravelli Listening Room, please fill the form below and we will contact you back soon with a draft of your visit.
If abroad, a loan of a GBA speakers is also possible – contact us.

Request a visit of Gravelli Listening Room

Manufactory & Showroom

Gravelli s.r.o.
Pod Harfou 3, 190 00 Prague 9
Czech Republic

+420 737 427 491