Very low output level on aux

[wbyeats]

Hi guys, I have several echoes in my home. Three of them are connected to an external amplifier:

- an old Denon multichannel amplifier
- A nad 3120
- A class D amplifier made by Sabaj

In all of them I have to really set the volume near the maximum level, and set the echo to play at 7/8/9 to get decent music volume (with the voice resulting then too high). I made a test using the same cable but connecting a chromecast audio and I had to reduce the volume of 30/40% as it was too high. The test I made using spotify.
Why it is so low? Is there any way to have it play music higher?
Thanks a lot

[renegade600]

did you set the volume in the alexa app?

[wbyeats]

did you set the volume in the alexa app?

In the app I set the volume and no matter what I set when I get back I see the volume that I set speaking to it