They are hardwired and the light is on. When I push the button the alarm comes on but I just recently got a new furnace and the guy said the smoke detectors would come on when he first started the furnace because it had to burn off oil. Well, they didn't. I also blew out a candle under each of them and nothing happened.
So you have resonance in the plywood affecting the speaker characteristics ? I'd read that MDF was a better material than ply for just that reason - that it was a lousy building material which paradoxically made it better for speaker cabinets. I'd think you could stiffen the ply with stringers glued across the inside faces, which would raise the resonant frequency, or maybe glue on something like thick rubber sheet to damp it. You are going to get a fundamental resonance just from the size of the box, from the air column. I think you can break that up by adding fibre batts inside the cabinet.
nicely shall we see, they could deliver you a letter telling you which you're breaching government rules for saving ability, i does not placed that previous em, its going to be a stealth tax test needless to say if it extremely works they usher in new legislations so they could superb you. or possibly your costs will exchange reckoning on your ability intake etc. they have some very creative think of tanks the government that are there for the purpose, of compacting extra funds out of the damaging british taxpayer
