Hi guys! Im having some problems with my sound system, currently got a sony xploder headunit, my back left speaker has stopped working, i dont know whether its a wiring problem or if the speaker has blown, now that this has happened i have decided to upgrade the whole thing! however the front speakers, can you just flick the speaker grill off with a screwdriver or do you need to go in from behind the dash??? and also the rear speakers to you have to take the whole doorcard off or can you remove the grill some way? im a bit baffled? help would be much appreciated! many thanks ryan