Steve - yes, you're quite right.
2 x 230W @ 1% THD+N, 20Hz – 20kHz, 4Ω, SE
500W @ 1% THD+N, 20Hz – 20kHz, 8Ω, BTL
We had an ICEBlock customer who wanted 500 wpc @ 8 ohms, and these were the only way to do it. They're more powerful than the ASP500 modules but less well finned.
The BTL power is higher than twice the SE output. I don't know why.