Originally Posted by
mk2 cossie
not familar with sierra speaker locations, but if they are in the door cards and rear trims which are made of recycled paper, then get in there with some fibre glass resin to beef everything up
be suprised how much extra bass and clarity you will get
what alpine speakers have you got, and whats powering them as well?
the speakers are in the bottom of the dash and at the sides of the parcel shelf and are only 4inch coaxial all round.all powered by an up to date kenwood 50 x 4 cd unit.might just try and buy a parcel shelf and fit some better speakers as said above