I’m a long retired broadcast and recording engineer.
It may be that without HA’s you turn the radio to a higher level.
Then with the HA’s you set the level lower because the HA’s are amplifying other sounds and noises.
Do you have an SPL meter?
I’m a long retired broadcast and recording engineer.
It may be that without HA’s you turn the radio to a higher level.
Then with the HA’s you set the level lower because the HA’s are amplifying other sounds and noises.
Do you have an SPL meter?