The Phoenix Gold ZLOC4.4 is a 4-in/4-out active line-output converter designed to integrate factory audio systems with aftermarket amplifiers by converting speaker-level signals to low-level RCA outputs. It features an aluminum chassis, adjustable gain, selectable ground isolation options (GND/ISO/200 Ohm), REM In/Out, a CLIP indicator for signal monitoring, and Bass CUBE equalisation with centre frequency 20-110 Hz and boost range -9 dB to +9 dB for subwoofer tuning.