12” active reflex subwoofer. Low-frequency power amplifier (class d) 250w rms, 500w peak. Preset integral peak limiter prevents signal distortion and amplifier clipping. Integral phase switch with 0° and 180° selections. High pass frequency selection:150hz. Thermal, dc fault and short circuit protection XLR / 1⁄4 ” combo jack inputs. Balanced line level output. Preset limiter prevents signal clipping. Integral pole mount adapter.