This is my experience with the WiiM Amp Ultra. First of all, here's unboxing video.
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Before I get down to business, must confess. I never even imagined I would like the new Remote 2 so much..




Excellent Completion
The 3 WiiM Amp sisters side by side.
It may not be new to those who already have an Ultra, but the weight is completely different, giving it a luxurious feel and a high level of satisfaction when I hold it in my hand.
Speed comparison of standby on/off by Remote. Amp Ultra is so fast.
Top:Amp
Middle:Amp pro
Bottom:Amp Ultra
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Screen comparison between Ultra and Amp Ultra. Although there may be individual differences, the Ultra's screen looks slightly yellowish compared to the Amp Ultra.

I believe the resolution and refresh rate are the same; the UI is basically the same as the Ultra and I didn't notice any difference in touch sensitivity. No particular problems.
The orange VU meter looked more beautiful on the Amp Ultra.
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Comparing the aluminium chassis, the Ultra has joints, whereas the Amp Ultra is one-piece. Chassis sizes also vary slightly.
The back panel of the Amp Ultra is similar to the Vibelink amp, but as you may know, the speaker terminals are colour-coded.
Note, however that unlike previous WiiM Amp sisters, Optical, HDMI, USB and LAN jacks on the Amp Ultra are upside down. I was a little confused during set-up.
Since I had 3 WiiM Amps lined up, I played each one for an hour and compared the temperatures.
Use an inexpensive kitchen thermometer.
First, temperatures were measured on 3 units that had been on Standby for more than 12 hours.
[Amp Ultra] Top: 32°C, Bottom: 31°C
(CPU temperature: 43°C)

[Amp Pro] Top: 33°C, Bottom: 31°C
(CPU temperature: 44°C)

[Amp] Top: 34°C, Bottom: 31°C
(CPU temperature: 42°C)

One "Sade" album was played at approximately 75 dB (1m) with the EQ and Sub turned off respectively. (My speaker is 8 ohms/87dB)
After 1 hour...
[Amp Ultra] Top: 39°C, Bottom: 38°C
(CPU temperature: 53°C)

[Amp Pro] Top: 39°C, Bottom: 39°C
(CPU temperature: 59°C)

[Amp] Top: 39°C, Bottom: 37°C
(CPU temperature: 52°C)

The CPU was hottest on the Amp pro; the Amp and Amp Ultra were almost identical.
The temperature of the top panel was almost the same for all three units.
Also, the Amp Pro seemed to have a harder time lowering its CPU temperature after standby compared to the others. (I will not pursue this at this time as need more time to investigate this.)
Note that Amp Ultra has been tested before. After 7 hours of continuous playback at approximately the same volume, the results were as follows.
[Amp Ultra] Top: 46°C, Bottom: 42°C
(Sorry, I forgot to look at the CPU)
Now, suddenly the topic changes, they say that Amp Ultra is Wi-Fi 6E compliant, is this true?
...Yes, I was able to connect successfully
I did almost all other basic operational checks and could not find any problems with the Amp Ultra hardware. On the software side, we found a few small bugs,
but these have already been fixed, or I'm confident that they will be improved soon.
Overall, I thought it was wonderfully complete.
I used to Ultra+Vibe as my main system. But I've fallen in love with the Amp Ultra so much that I now use it as my main system. For me, the sound quality of the Amp Ultra is excellent and I love the simplicity of having just one unit
(From the scene during my test.)
Thank you
