The Pioneer DJM-900 NXS2 is a great step up from the previous model. Better and smarter circuitry. Better sound, dual USB inputs. Phono/Line on all 4 channels (no more annoying setups!). Re-engineered FX section. Filter FX greatly improved. An all over great upgrade from Pioneer DJ and at 96kHz 64-bit output. Pioneer steps it up as the mixer of choice for clubs worldwide.