AV-705 and AV-505. The AV-505 was my favorite. The AV-505 was only rated 80 watts per channel ACD, but was able to derive power from the transformer to go to any particular channel for more power than it was rated. Each channel has it's own modular amplifier, but they all draw from same power supply. Each channel is extremely rugged with heavy extruded heatsinks as large as you would find a decent size receiver, only it has one for each channel. The 705 was a little different, but was a higher wattage model. I never felt that it was built as well (like it was a succeeding model after the success of the AV-505)