Sound over Bluetooth is very soft

Hello Kien team,

When connected with my computer over Bluetooth, I have to put the SAT volume to 90% or more and my computer's volume to 80% or more to hear treble and mid. Bass coming from SUB seems ok.

If I perform the same while connected over Spotify Connect, the volume of treble and mid is acceptable at 50% SAT volume and 50% computer / phone volume.

Is it expected?

Thanks