Lol long list. The stereo room in the last two homes the current one has 5/8 OSB then a layer of 5/8 fire rated drywall. Six dedicated powerlines with the wire crossed over it self so nothing runs parallel. All the wires the same length. The wall behind the speaker has a slight upwards angle the front corners of the room are angles off as well the ceiling rises a bit for the first eight feet. Stands under speakers. Diffusion panels bass traps absorption panels. Equipment stands furutech receptacle s put in power cords assembly. Amp stands arial mounting bracket. Lp holder cd cases. 78 case. Wall mount turntable shelf. Lol that's just the shortlist. As far as why i believe dense wood makes the best equipment stand that being said I make them out of thick slabs of either rosewood or purple heart. Also I have used walnut and bamboo planks in secondary system s. And of. Of course monetary reasons as well. Cheaper to make than to buy the ones built in lessor material. The base traps I made so I could vary the amount of suction they have so they are tunable. Signs telling people not to touch LoL. Spikes for stands as well.
Regards