From My Experience With Wharfedales, they always shine with More Power. By the way, 6.5" Woofer, 87db, 4ohm lower impedance and AMT Tweeter will be better driven by high power amplifier. Please check the crossover points, there's some technical snag when integrating AMT Tweeter in a 3 Way, (I don't remember the link reference, neither the technical jargon, Something to do with limitations of AMT Tweeter below 3khz) but the resultant issue is Woofer Lags if its driven by underpowered amplification. Someone owning the speakers can give us a better insights.