30-Mar-2020, 21:49
Not going to comment on this ‘review’ but I think this may be (the source of) the amp: https://www.audiosciencereview.com/forum...ada.12107/
(30-Mar-2020, 21:51)alaw Wrote: [ -> ]A couple of year old 200 watt amplifier, that can’t produce 20 watts of 20khz into 4 ohms (it shuts down), and no one suspects it might just be faulty? A bad capacitor or some such? Not really a credible result. ASR should try measuring a new one.
(30-Mar-2020, 21:51)alaw Wrote: [ -> ]A couple of year old 200 watt amplifier, that can’t produce 20 watts of 20khz into 4 ohms (it shuts down), and no one suspects it might just be faulty? A bad capacitor or some such? Not really a credible result. ASR should try measuring a new one.
(30-Mar-2020, 22:04)Confused Wrote: [ -> ]Can anyone explain this?
(30-Mar-2020, 22:55)ogs Wrote: [ -> ]This makes sense, however, I recall one time I was running a 18kHz test tone armed a sound meter. It was quite good fun to turn the volume up and down, and see the SPL meter rise and fall, whereas I could not hear a thing. (My own heating tops out at about 16kHz)(30-Mar-2020, 22:04)Confused Wrote: [ -> ]Can anyone explain this?
I'm not sure I know, but I suggest the following: The design does not have enough cooling for full power measurements (which uses sustained test signals) so the protection is configured to trig at a very low (safe) level. Music is dynamic in character and thus will not trig protection.
Give a Devialet amp massive (enough) cooling and re-program the protection logic and the amp would also measure at full rate.
(30-Mar-2020, 23:10)Confused Wrote: [ -> ] Maybe this was only using a few watts?
(01-Apr-2020, 01:33)whatmore Wrote: [ -> ]Amir has reached out to Devialet for a response.
There are questions that could easily be cleared up but I wonder if they will be as woefully uncommunicative on this as they are with pretty much everything else….
sam1000 Wrote:whatmore Wrote:Amir has reached out to Devialet for a response.
There are questions that could easily be cleared up but I wonder if they will be as woefully uncommunicative on this as they are with pretty much everything else….
Since the device is not under warranty, does Devialet really need to respond? How many other manufacturers would respond to similar requests?
Someone on ASC posted the following links for 170 measurement. It's the same hardware. Registration is required to read these report.
This seems to be pretty comprehensive tests, but done only at 1khz.
http://www.milleraudioresearch.com/downl...t_170.html
http://www.milleraudioresearch.com/downl..._lpcm.html
http://www.milleraudioresearch.com/downl...0_usb.html
On the other hand, its about time for Devialet to explain if their units are tested for full power using multiple sign waves. Many people do refer to Stereophile's measurement of original D-premier. I thought that would have been taken care of in last 8 years.
(01-Apr-2020, 05:27)sam1000 Wrote: [ -> ]Since the device is not under warranty, does Devialet really need to respond? How many other manufacturers would respond to similar requests?