For what it's worth, I think Bryston has a history of being fairly honest about the performance of their products in terms of driving very low impedances. For example, it is well documented in the owners manual not to use the bridging feature with speakers rated at less than 8 ohms, and have seen them discuss this on the web as well.
I am not sure I understand the comparisons to tube amps. How many of them double into lower impedances? Just taking some random shots in the Stereophile archive, I didn't see any. Is there actually audio tube amps in the marketplace that will deliver 700W into any load? The most powerful amp I saw was the VTL S-400 at 350W, but it costs as much as a Camry.
I am not sure I understand the comparisons to tube amps. How many of them double into lower impedances? Just taking some random shots in the Stereophile archive, I didn't see any. Is there actually audio tube amps in the marketplace that will deliver 700W into any load? The most powerful amp I saw was the VTL S-400 at 350W, but it costs as much as a Camry.