If what you said was true, this supposed lack of power would have shown up as a harmonic distortion artifact in the listening test. The fact that both systems were indistinguishable proves that neither system was suffering in any particular way.
Of course what you have said is nonsense, and shows a misunderstanding of the relationship between an amplifier and speaker. The watt rating of an amplifier simply indicates the operational range where it can perform with near-zero harmonic distortion.
The ATCs are moderately efficient 8 ohm speakers. They barely need 15 watts let alone 150 watts of power to "perform right" at tolerable listening levels. Both amps are capable of delivering ample power with plenty of reserve for transients.
Of course what you have said is nonsense, and shows a misunderstanding of the relationship between an amplifier and speaker. The watt rating of an amplifier simply indicates the operational range where it can perform with near-zero harmonic distortion.
The ATCs are moderately efficient 8 ohm speakers. They barely need 15 watts let alone 150 watts of power to "perform right" at tolerable listening levels. Both amps are capable of delivering ample power with plenty of reserve for transients.