The EQM131 will provide basic system equalization for sound masking or general public address applications with an amazingly inexpensive price. The 1RU tall EQM131 is easily attached to any system through rear panel balanced TRS and XLR jacks. Unbalanced RCA connections are also provided for use with -10dBV equipment. Front panel mounted LPF/HPF and level controls are provided in addition to a switch for +/-6 or +/-12dB operation and 31 sturdy 20mm filter slide controls. The ISO centered 1/3 octave bandwidth-constant Q filter design minimizes interaction between filters however continues to be wide enough for creation of correction curves.