25-Aug-2019, 10:42
(15-Jul-2019, 08:40)hungrydad Wrote:(10-Jul-2019, 09:44)RebelMan Wrote: Expert 140 Pro Expert 220 Pro
8 Ohms 105 W 165 W
6 Ohms 140 W 220 W
4 Ohms 210 W 330 W
2 Ohms 420 W 330 W
I have asked Devialet about the 2-ohm continuous power of 220 Pro in two different occasions before and got two different answers: 660W and 500W respectively. Not that I think the answers I got are more accurate (I shouldn't have got different answers in the first place), but I can't understand how a 220 Pro could do worse than a 140 Pro for a 2-ohm load, given that they have the same chassis and the power supply of 220 Pro should be no worse than 140 Pro (if not better). I am curious to know if the above power figures quoted for 140 and 220 were all provided by the same person?
BTW, just for additional information, I found another review from the Stereo magazine ( https://stereo-magazine.com/flipview/epaper/stereo-magazine-20-2019-20/ ) which posted somewhat better measurements for the 220 Pro than what Hi Fi World did: 173W at 8ohms and 343W at 4 ohms. Not sure which review is more correct, but to me the differences are not night and day and could be just due to different test conditions.
A correction needs to be made. The amount of power the 140 can feed into a 2 ohm load is 210 W RMS, not 420 as originally disclosed. This is because of a limitation built into the software. When the 140 is configured as dual-mono mode (A.K.A. a 210) the software unlocks the lmitation and the output is as follows...
Expert 140 Pro in Dual-Mono (A.K.A. 210)
8 Ohms 157.5 W
6 Ohms 210.0 W
4 Ohms 315.0 W
2 Ohms 420.0 W
The information I received initially was misleading and provided by two different individals.
What I find interesting is when the Expert 220 Pro is configured in Dual-Mono the output power looks like this...
Expert 220 Pro in Dual-Mono (A.K.A. 440)
8 Ohms 330 W
6 Ohms 440 W
4 Ohms 660 W
2 Ohms 660 W
More power is available in the latter for 4 and 2 ohm loads but runs flat at 660W whereas less power is available in the former for 4 to 2 ohm loads but runs more linear at 315W to 420W respectively. An amplifier's output that follows the impedance curves of the speaker more closely than another will perform better, meaning less likely to distort/clip.
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