... well what can I say , everyone who has build a cabinet knows what it means when it resonate , but if other members have the speakers and they are not having the same problem , either something is wrong with your speaker or configuration . You must then hear an array 1400 that doesnīt resonate to really know if you are missing something .
Also I do not think those speakers rated at 89dB sensibility can be well driven by a 1 watt "mini amp" , I have a pair of "over 100db" sensitivity speakers driven by 1.5 watts and they are "just enough" to get good sound .
Yamaha P5000S has 500W RMS per channel.
It seems that all Arrays vibrate. Can you hear it is a different question.