This is a review and detailed measurements of the O-Noorus D3 Pro stereo class D desktop amplifier. It was sent to me by the company and costs US $249 with the included 48 volt@5 amp power supply.
As you see, the D3 Pro has a colorful display. I like the large volume indicator whose color and brightness you can change. A remote control is provided which necessitates a digitally controlled analog volume control (this can have a hit on performance):
Connectivity is extensive for this class supporting a number of different inputs including HDMI ARC. The speaker terminals are pretty close together and small. While they fit my locking banana plugs, it was a tight fit.
Back to remote, there is supposed to be a mode to turn off the volume control but I could not figure out how to get into that with either the remote or front panel. So for all the testing, the volume adjustment was in the loop.
PFFB is implemented which should lower or eliminate load dependency.
Maybe due to inclusion of all of this functionality, the amp runs warm even when sitting idle. While it didn't burn my hand, at the end of the testing, the case was toasty.
O-Noorus D3 Pro Amplifier Measurement
I adjusted the volume control to 74 which gave me 25 dB of gain. RCA input and digital Coax produced identical results indicating the amp is the limitation:
This is very respectable performance:
As is noise:
PFFB implementation is good but not perfect:
Crosstalk though, is near perfect:
Multitone and 19+20 KHz intermodulation tests both show the weakness of this class with rising distortion at higher frequencies:
The amp is pretty powerful for its size:
Since the amp runs pretty warm as is, I didn't want to push it at 2 ohm in stereo. But did test one channel:
We see much rising distortion at higher frequencies yet again in our multiple sweeps:
The amp is rather noisy on power up:
But stable:
Conclusions
Boy, we sure have so many offerings in this IC based class-D desktop amplifier. Nice to see competent implementations such as this D3 Pro. Compare to much of its competition, it wins on comprehensive set of inputs and remote control. Measured performance is very good for class but for the price, I wish the PFFB was better.
I am going to recommend the O-Noorus D3 Pro stereo integrated amplifier.
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As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
As you see, the D3 Pro has a colorful display. I like the large volume indicator whose color and brightness you can change. A remote control is provided which necessitates a digitally controlled analog volume control (this can have a hit on performance):
Connectivity is extensive for this class supporting a number of different inputs including HDMI ARC. The speaker terminals are pretty close together and small. While they fit my locking banana plugs, it was a tight fit.
Back to remote, there is supposed to be a mode to turn off the volume control but I could not figure out how to get into that with either the remote or front panel. So for all the testing, the volume adjustment was in the loop.
PFFB is implemented which should lower or eliminate load dependency.
Maybe due to inclusion of all of this functionality, the amp runs warm even when sitting idle. While it didn't burn my hand, at the end of the testing, the case was toasty.
O-Noorus D3 Pro Amplifier Measurement
I adjusted the volume control to 74 which gave me 25 dB of gain. RCA input and digital Coax produced identical results indicating the amp is the limitation:
This is very respectable performance:
As is noise:
PFFB implementation is good but not perfect:
Crosstalk though, is near perfect:
Multitone and 19+20 KHz intermodulation tests both show the weakness of this class with rising distortion at higher frequencies:
The amp is pretty powerful for its size:
Since the amp runs pretty warm as is, I didn't want to push it at 2 ohm in stereo. But did test one channel:
We see much rising distortion at higher frequencies yet again in our multiple sweeps:
The amp is rather noisy on power up:
But stable:
Conclusions
Boy, we sure have so many offerings in this IC based class-D desktop amplifier. Nice to see competent implementations such as this D3 Pro. Compare to much of its competition, it wins on comprehensive set of inputs and remote control. Measured performance is very good for class but for the price, I wish the PFFB was better.
I am going to recommend the O-Noorus D3 Pro stereo integrated amplifier.
-----------
As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Saw the box and realized it had been sitting here a few months so tested it....
