Without looking up the manual for the Sony, I'd guess that there may be some settings on the head unit that need changing. Maybe there's different output (tone/equaliser) settings for the rear speakers that were changed due to the sub being present?
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Need a T4 ?: T4 Owners Map thanks to Stevestrat ( use at your own risk)
Where?:
https://en.wikipedia.org/wiki/Tanelorn
Mods/Retrofits:
PCV vortex 'filter'; bluetooth; inline thermostat; reversing sensors; plenum spyhole ; headlamp washers ; Diy mp3 player replacing CD multichanger; FBH with remote; Headlamp washers; black/chrome front grille, rear blind; Xenon projectors
To do:
puddle lights; 2 Din cd/nav to fit; boot release button
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