I'm looking to replace the speakers in a friends Ampeg 410 hlf. He's using an Ampeg SVT 4 Pro with, what, 1200 watts? The cab is rated for 500 watts and he tends toward an aggressive slap style. The drivers have been over-extended with the tell-tale ring-break near the basket's rim. What should I use as replacement speakers? I'm thinking of having him get higher wattage speakers but wonder if the cabinet's design will handle different power dynamics. Is this a big deal? Can I install newer, more powerful (maybe lighter) speakers? He's asking about hemp speakers from A Brown Sound. Thanks for any help in advance!