Sphärisch HS (Horn Speaker) is the best option for realistic and ear comfortable sound production. There is only one driver connected without any crosover for minimizing components in signal path. The high driver sensitivity ensures that a low power amplifier is sufficient to drive the system. Ideal one is vacuum tube amplifier, which use single ended triode. Big horn enclosure will take care of sound wave delay and amplifaction. Our Sphärisch HS is in the production phase. After completing it and testing it, we will gladly present it to you. Prepare that he will be big and great.