Adcom GFA-545 (1986 – c. 1991)
The GFA-545 was the smaller sibling of Adcom's GFA-555. It used the same basic circuit topology at a lower power rating and price. An ad in Audio (June 1986, p.54) pitched it as "100 watts. High current. GFA-555 technology," which meant 100 watts per channel against the 555's 200. Like the flagship, it was a high-current design. Audio (November 1986, p.31) noted that the GFA-555 "transient capability" exceeded 800 watts into 2-ohm loads, and the 545 followed the same engineering approach.
By 1991, Adcom had released the GFA-545II, an updated version with refinements learned from the thousands of original 545s in service. Audio (May 1991, p.22) described the original series as having set a new standard for "astounding power, sound quality and affordability." The 545II aimed to "refine and balance the details you can hear" and improve long-term reliability.
Little formal documentation survives for the early production run beyond the review excerpts. The basic known specs from period sources:
- Power output: 100 watts per channel into 8 ohms
- Design: direct descendant of the GFA-555, same circuit topology
- Emphasis on high current delivery and transient capability
- Successor: GFA-545II (c. 1991)
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