Ah, see that on the brochure page for a 1 watt output +0,-1 dB. I imagine it rolls off a bit, as does the new series as well according to what Crown told me when I inquired. I currently have three on sub duties. An important factor which we sometimes ignore is the room gain. In a rather small listening space, room gain will help compensate for a slightly deficient sub or sub amp infrasonic response.