Sound Quality ..."even the lowest frequencies were a piece of cake for the Sub 22-500 and were reproduced effortlessly."..."Sound pressure level was more than enough. Its top quality reproduction qualities were then checked in stereo mode. According to volume settings the sub delivered either a discreet addition to the satellites or produced a massive base with extraordinary pressure. The bass equalizer remained in neutral position (not necessarily due to laziness), since the low bass qualities were more than adequate even for the most discriminating listeners."
Summary In our lab the Sub 22-500 proved to be a formidable performer; therefore, we do recommend this sub, especially for very powerful sound systems. A music lover who already possesses a dynamic room environment or plans to have one in the future, should put the Sub 22-500 on the short list. In view of the top quality and the powerful amplifier module the asking price by Strassacker of EUR960 seems to be justified.
Sub 22-400 description the smaller Sub 12 Sub 22 with less power: 300/600 Watt the big Sub 42 with 1000/2000 Watt Home