This is the back of a loudspeaker enclosure (speaker) which I’ve been using for a few years. It’s not one that I made. It’s a Carlsbro speaker and like ~80% of the speakers sold in the UK it’s made from MDF (Medium Density Fiberboard.) As such it is prone to deteriorating. It’s unclear why this one has broken down so much but water ingress is a likely cause. The vibrations from the loudspeaker cone don’t help matters and this caused a serious deterioration in sound quality from the (loudspeaker)Cabinet. In this video I simply show the level of deterioration. I later fixed this with a sheet of Birch-Faced plywood and it’s now matching the output from the other cab.
Better to build loudspeaker cabinets from decent quality ply in the first place and save the repair job entirely. The Loudspeaker industry is geared around impressing customers with high power consumption and cheap production costs. Everyone wants 1000watt for £50. But there is more going on than just power consumption. Some loudspeakers are just louder than others. (More efficient). And don’t require the same power input to reach a prescribed ‘volume’. That’s why we build our own speakers. They genuinely are better. We use complicated designs which work better but take a lot of work to build. So would be expensive to buy.