"WPG - 315 Two channel Graphic equalizer","The WPG-315 fits standard 1U, 19\" (482mm) racks. Using proven circuitry this equalizer is straightforward to use, reliable in operation and capable of excellent performance. The WPG-315 is housed in steel cases suitable for mounting in professional flight cases. WPG315 has the same features as WPG-331, except 15 equalisation bands per channel and without high-pass filter."