ひょっとしてそういう仕様のプラグがあって、間違って買ったのかと思いましたが、そういうものもなかったので不良品っぽいですねえ。
真ん中が不通のヤツはあったんですけどね。
配信セットはなるだけ変な改造は無しで作ろうと思ってたので、ケーブルだらけになってます。

I wondered if by some chance the plugs just had those kind of specs, and I'd bought them by mistake, but there weren't any plugs like that, so these were just kinda defective. They did have that nonconductor thingy in the middle, though.

I was hoping to make my broadcast set with as few weird mods as possible, but it's got cables all over the place.