The Maestro Parametric Filter is a tone control device for parametric equalization and controlled distortion for guitar, bass and other electro-acoustical signals. Input Impedance................1 megohm Maximum input level for 1% THD....................OdBm Natural mode with HEIGHT control set to 0 and 1kHz sine wave Output Impedance ..............10K ohms Equivalent Input Noise Natural ....................—88dBm max. Overdrive....................—86dBm max. FILTER CHARACTERISTICS MAXIMUM BOOST OR CUT Sharp ..............8.0 .....±20dB Medium ............1.4 .....±15dB Broad ..............0.3 .....±12dB THD in overdrive mode 20% THD pre- with -20dBm sine wave dominantly 2nd input .......................harmonic Overall Frequency Response 30 to 15kHz (With HEIGHT = 0).............±3dB Power Requirement.............9.0 volts at 750 milliamperes Recommended Battery Type .....NED A 1604 Estimated Battery Life........... 300 Hrs.