Car: Toyota C-HR with factory JBL speakers
Head unit: HA5462-Vivid10-CP-HD
When there is no media playing and the volume is set as low as 1, there is a noticable audio hiss from the speakers. If the volume is muted, the hiss goes.
I have tried setting the amp to -15db in the 'extra' factory settings, but the hiss is still there.
How can I get rid of the hiss?
Thanks
(Edit: title should be "Loud 'hiss' when no audio playing" but I can't change it!)