State of the art speakers from yesteryear.

Jbl Hartsfield (Older version) with Super tweeter and subwoofer. This speaker sounded very close to the Quad ESL 57 in the midrange (I had both at the same time) but could fill a theatre full of sound.

Most Apogee Full Range Ribbons (Full Range, Scintilla, Diva, Duetta,)

Many other great vintage pieces that the Japanese covet for good reason.

Polk Audio SDA series.

Spica - Angelus, TC-60, TC-50

Bozak Concert Grands or Symphony's...can,( with some TLC, if need be),sound remarkably good and will compete with many "modern" high-end (overpriced?)designs.

I had a pair of NS-10s. They were not what I would call one of the great speakers of yesteryear. Sure you don't mean the NS-1000s? THOSE were/are great. My parents still use theirs and they are wonderful.