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The units that i put in my pictures JBL AND ALTEC A7 both designs have a resonance just like all wood that you would rap your nuckels on even 2 inch thick plywood will resonate at a given frequency, that goes for glass, cement, metal, they all doit.  The nuckel test on the A7 is about 350 Cycles with no overtones or vibrations. The problem with the A7 Is the weak box constuction with no extra 2x2 reinforcement on the large side walls and back, those are the real problems. When you put a tone threw the woofer at 1 watt you get out 103 db at 333hz. So you thank you are going to hear a spike or see one on your RTA at 350 hz, Sorry you won't. Altec A7 that i have is the one that has 1 1/4 rapped dense fiberglass around the horn with fiber washers stapled to horn, and it has a single tone only when you put your nuckel on it, without viberation. I use mine for playback in my studio not for monitoring. These A7 are not perfect to use for sound reproduction, they serve a purpose with a large room of 46X30.  Preaching Horn Religion   MSAUDIO

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