with the 5800 series. Adcom started using some real power supplies. they have great dynamics and can drive just about any speaker. with some simple mods they can really sign. The 555 was an OK amp designed to a price point, not in the same league as the 5800 series.
Opinion on the GFA 5802
Just purchase this amp at at a really good price with a GFP-565 pre. Anybody experience with this amp? Im using it to power some DIY Dayton Audio speakers.