@enderland Oh well, you got a good point there. Surely, that would be a too broad scope. Though I'd say the soundboards should also be on-topic, because you can't really ask hardware questions on Music: Practice & Theory but questions about camera recommendations seem to be accepted on Photography. So if it's too broad we''l get into a conflict with other SE-sites. But let's here some other opinions.

@enderland I tried to phrase generally. Headphones are usually (or can be) used with a computer or smart phone, so I'd suppose they count as peripherals -> on-topic. Audio equipment (like microphones) are connected with a computing device. Even if you're really old-school and got a piece of hardware for every effect (instead of a DAW) I'd say those components also count as computing device. Maybe, with the possible Furniture site I mentioned, a computer desk (with cableguides, possibility to attach tower) may fall between the cracks.