@Abduallah Khalf Hi-Res output is not guaranteed to work on all devices. If it doesn't work for you, you can try other outputs. On the recent Androids AAudio output should be more stable, but anyway, there are devices with broken AAudio output as well.
For the default settings, AudioTrack output (as well as OpenSL output) should match in volume to other players. If it doesn't match for you (on default settings, as you can always adjust preamp, and various Poweramp gains to change that), please see here:
https://forum.powerampapp.com/kb/en_us/faq/volume-issues-r7/