I had the old Ashdown 4x8 600 watt cab years ago. Bought it for peanuts with seized drivers. Totally oblivious to the complexities of cabinet design I bought 4 150 watt Celestion drivers from Blue Aran, bunged them in, hooked up the wiring and gigged happily with it for the next 4 years. Always sounded fine and never missed a beat. Ignorance can apparently be bliss.