AMPEG PF500 PORTFLEX HEAD. Bass tested with 500W of 4 Ohm RMS power, Class D Mosfet preamplifier, 3-band equalizer with high/medium/bass and 5-step midrange frequency selector, integrated compressor, ultra Hi/Lo boost selectable through 2 dedicated switches, switch for Mute and Pad -15Db. It has connections for footswitch, preamp In/Out, tuner and Fx Send/Return via 6.3 mm Jack, speaker connections via Speakon and Jack, balanced Line out via XLR with dedicated switches for Pre/Post Eq,
Pad 0/40 Db and Ground lift.