Onkyo TX-NR525 - World Exclusive Knob Feel Review The brand new Onkyo TX-NR 525 has only one redeeming feature, It looks pretty. With it's concave-dished front and sleek surround, I was excited to get my analytical appendage on it. But immediately, the plastic material, the sharp edges, the slippy surround & the inexcusable amount of axial skew really disappoint.