OP
- Thread Starter
- #1,801
Those 8 ohm soundstage measurements are highly suspect. It's not 100W more, it's almost 175W more. This doesn't agree with Purifi, or the review here on ASR. 375W into 8 ohms corresponds to 54.8V RMS, and 77.5 peak. The max power supply rating for the EVAL1 is +70V and +75V for the 1ET400A. Output swing would be somewhat less than that, so it should take >80V supplies to get 375W (assuming the drive circuitry had the range).What is the reason for the pretty sizeable difference in Purifi output power measurements between their own measurement (top chart) and the soundstagehifi measurement (bottom chart)? In 8 Ohm its about a 100W difference - is it because of the input buffer being bypassed or not? And if so, why would one want to bypass the buffer if power output drops by 100W..?