This might also be interesting for you.
This is the source for our concrete. High competence in concrete and additves for concretes: moertelshop Sverige
Electronics and parts
ABACUS-electronics is our partner for active loudspeakers.
Loudspeaker parts and loudspeaker accessories are available at högtalarshoppen.
Axel Ridtahler is the inventor and patent holder of the RiPol technology.
Uli Brüggemann developed a very good room correction, crossover and DSP software (acourate), which we use for final comparison puposes.