Kappas are power hungry and sound pretty harsh if you under power them i had both and think they sounded horrible on low power. the 6x9's can take quite a bit more power then the 4x6 plates its better to buy an amp that is too big and keep the gains down then to buy a small amp and jack them up
go for a 75x4 such as a jl 300/4, diamond audio 600.4 or a phoenix gold tantrum 600.4 or even titanium 500.4 if you have the cash for it. check sounddomain.com they are having a sale on phoenix gold right now...you wont regret buying a PG amp
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