In the meantime I have done some testing. The results are worse than I expected.
Here’s my description and results.
Test case set up
- 2 active HiFi speakers, each with a Up2Stream Mini v3, with FW 4.6.328252.28, 20210903.
- Used in testing: iPhone 11, iOS v 15.0.1, 4Stream App v 2.8.9905.
- WiFi strength on both speakers: both 100%
Problem 1 description
While playing music, without changing volume, this happens:
- One of the speakers can suddenly stop playing music, just for a split second. And then start playing again.
- If this hick-up happens, there’s also a clear latency between the two speakers. This solves in 1 – 3 seconds.
- The hick-up sometimes happens on the left speaker, and then suddenly on the right speaker. In just 5 minutes the hick-up can happen 6 or 7 times on the left or right speaker.
Problem 2 description
When changing volume, the volume does NOT change equally on both channels (L + R).
Case 1: volume UP testing– Starting with the volume set to 0, the volume is increased in single volume steps, by pushing the volume up button on the iPhone. The following screenshot sequence shows what happens with each step. If you look closely, you can see that the volume on left and right channel move uneven.
What happens with volume UP
- 1st test – From 0 to 1; only the right speaker responds, the left speaker stays at 0 / off. When increasing the volume from 1 to 2; the right speaker goes up one level, the left speaker jumps from 0 to 2. It seems that at every uneven volume up step, only one channel responds. And at every even volume up step, one channel moves 1 step and the other moves 2 steps.
- 2nd test – Doing exactly the same (moving up the volume step-by-step), I noticed following. From 0 to 1 only one speaker goes on (like before). After moving to level 2, the other speaker also switches on, but the volume difference remains 1 step between the two speakers. Even after increasing the volume 7 steps.
- 3rd test – Doing exactly the same again, so starting at volume 0. The 4Stream App does not respond at all to increasing of the volume by pushing the iPhone volume buttons.
- 4th test - When using the 4Stream App for volume control, and increasing volume by using the ‘Group volume’ slider, left & right speaker move equal and in the right steps.
Case 2: volume DOWN testing– Starting with the volume set to 6, the volume is decreased in single volume steps, by pushing the volume down button on the iPhone. The following screenshots sequence shows what happens with each step.
What happens with volume DOWN
- 1st test – From 6 to 0; at the starting point, the volume levels at left and right speaker are even. From the first step for volume down onwards, one speaker stays a level behind. This goes one coming to level 0. But the speaker that was one level behind is unable to reach level 0. So, the volume stays on with one speaker. It is not possible to get it to 0 / off.
- 2nd test – More or less the same happens, but sometimes the difference between the left and right speaker, is 2 levels.
- 3rd test - When using the 4Stream App for volume control, and decreasing volume by using the ‘Group volume’ slider, left & right speaker move equal and in the right steps.
- Besides controlling the volume by pushing the physical volume buttons on the iPhone, I also used the volume slider in the Spotify App. When moving the Spotify volume slider, and then looking at what happens with the volume controls in the 4Stream App, I could see the same problem happens. So controlling the volume by iPhone volume buttons or Spotify volume slider, makes no difference.
- Controlling volume with the ‘Group volume’ slider in the 4Stream App works correct.
- I have this issue now on 3 of my speaker projects. All 3 are stereo sets, so two speakers (with Up2Stream Mini v3) combined to a group as a stereo set. Each speaker pair is in a different house on a different WiFi network.
- All three sets behave the same as described above.
- All three sets functioned well for several months, until the firmware changed to v 4.6.328252.28.
- What I also experience with the latest FW, is that sometimes when I switch off power, and then switch it on again, the Up2Stream Mini boots up in setup mode, instead of just restarting and remembering all settings.
- Who is experiencing the same?
@rakoit @arylic: this looks like a bug, can you please comment?