Threshold T-800D
Little is documented about the Threshold T-800D beyond its appearance in late-1990s audio magazines. What the period record does show is a serious, fully balanced power amplifier. Audio (November 1997, p.72) described Threshold's fully balanced differential topology, which gives two identical signal paths for each input phase. It also noted that the T-800D's frequency response was virtually unchanged from open circuit to 8-ohm and 4-ohm loading. That points to a very low, uniform output impedance through and beyond the audio range.
Audio (November 1997, p.70) also mentioned a three-position input mode switch on the front panel, with a green LED to confirm the switch is set correctly for the incoming signal type, plus an IEC line-cord connector and a line fuse. A directory listing in HI-Fi-Stereo-Buyers (1998, p.104) priced the T-800D at $5,495 and gave dimensions of 17 × 15½ × 7½ inches, a weight of 38 lb, a direct-coupled input circuit, and a frequency response spec of 6 Hz–90 kHz (–5 dB). A pewter-gray finish was available for an additional $100.
Beyond those fragments, the record is thin. No production years, rated power, or family history appear in the surviving materials.
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