ADAM Audio A7V Studio Monitor (Pair) with ADAM Audio Sub10 Mk2 Sub and CablesADAM Audio A7V Powered Two Way Studio Monitor ADAM Audio HPS (high frequency propagation system) waveguide technology enables tweeters to disperse sound with controlled consistency, broad on the horizontal axis but tightly focused in the vertical plane. The A Series introduces a rotatable HPS waveguide design. You can shift A Series tweeters in 90 degree steps to continue to benefit from HPS waveguide technology whether you position the speakers