@Zek got it. Speakon is the usual speaker connector for pro audio, and from a technical performance point of view it should be more common in hifi. Benchmark claim measurably lower distortion than is common with spade lugs, bare wire or non-locking banana plugs, although you'd need a very low distortion amp like their AHB2 before that becomes significant compared to the amp's own distortion. That's with the genuine Neutrik ones too - whether it also applies to the cheaper clones is another matter. I don't think they'd fit on the back panel of an A07 either.