HB,
I think the reason the front speaker problem exists is due to the way the bluetooth system(Mediastream) is wired in to the amplifier as when I installed the radio and wired it in to the amplifier as per the amplifiers installation instructions, the fader control of the radio produced ample sound from the front speakers! I'm afraid i am not expert enough to give you the reason or solution to the wiring of the mediastream unit -Just that the radio install has resulted in full adjust-ability of all four speakers and I now have handsfree phone, all music on my Phone through the radio and I can change the sound output from each speaker through the app on the phone which controls the radio.
Cheers!
