have you checked that you have fitted the wires onto the spreekers properly and if you have cut the old speeker wireing to attach the new speekers to have you wrapped insulating tape around the joints? and just check all your plugs at the back of the stero as when you push it back it it can knock a plug lose

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Audi A4 Cabriolet 2.5TDI 163 Sport
Full Interior Lighting Pack - Puddle Lights, Footwell Lights, Door Markers, Handle Ambient Lights, Air Vent Illumination, Armrest Illumination, Roof Ambient Lights. Auto Dim Rear View Mirror, Cruise Control, Full DIS, Genuine 6 Disc CD Changer in Glovebox, RNSE, Remote Windows, Parrot Bluetooth, Storage Pack, Full Leather, Heated Mirrors