Advent 500

The Advent 500 model number shows up in period sources for two very different products, more than a decade apart.

The earlier one is the Advent Model 500 SoundSpace 4 Control, a surround-sound processor/preamp listed in Audio (June 1979, p.70). Its rear channels were specified at 20 Hz to 20 kHz frequency response with less than 0.1% distortion at 1.5 V output (1 kHz), and an 80 dB dynamic range. Input sensitivity was switchable (0.3, 1.0, or 3.0 V). The bass control was a Baxendall type with a variable corner frequency from 95 to 200 Hz. The treble feed control offered 6 dB boost to infinite cut above 6 kHz. The front channels were unity gain, basically a straight-wire bypass. Power consumption was 30 watts at 95-135 V AC, 50/60 Hz. No independent test report or user documentation for this unit has surfaced in the available literature.

The later one is the New Vision Series 500 loudspeaker, advertised in 1991 (HiFI-Stereo, April 1991, p.39; Audio, May 1991, p.7). It was a two-way system with a Helmholtz resonator band-pass subwoofer and an "Isolated Satellite Imaging Module (ISIM)" containing a dome tweeter. It launched alongside the smaller New Vision Series 350. Those are advertising claims only. No review or measured data for the Series 500 appears in the period magazines examined.

Beyond these magazine references, one spec listing and a few ads, almost nothing else is documented for either Advent 500. No service manuals, owner's manuals, production quantities, or pricing have been located.