When bridging which I do with my Bryston and McIntosh amps, the power output for 4ohm loads will be different than with 8ohm loads. With well designed efficient solid state amps the 4ohm power output will be nearly twice the power output with an 8 ohm load. That's why its important to know the ratings at both those impedances or ideally have a graph. The published data is inconsistent. 300w output at 8ohms bridged implies around 600w bridged at 4ohms. No way with that amp. 300w at 4ohm bridged is believable though I doubt even that is achievable given the high heat that receiver generates.
