A long-overdue update to this thread....
Having replaced the speakers, aerial and fitted a sub, the sound quality was still awful, so the OE head unit had to go. I wanted wireless carplay and double-din, BUT I didn't want to spend stupid amounts of money, so a cheap(ish) JVC went in. The actualy head unit was a doddle, but the surround was a faff - sorted in the end though by using part of the OE cage and some pop-rivets
Sound quality is now exponentially better and probably capable of blowing the windows out.
Having replaced the speakers, aerial and fitted a sub, the sound quality was still awful, so the OE head unit had to go. I wanted wireless carplay and double-din, BUT I didn't want to spend stupid amounts of money, so a cheap(ish) JVC went in. The actualy head unit was a doddle, but the surround was a faff - sorted in the end though by using part of the OE cage and some pop-rivets
Sound quality is now exponentially better and probably capable of blowing the windows out.