This is from the amp's user manual:

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re: the Seventy 80's, I used to have a Canadian-made tube amp (Traynor YCV-40T) that came stock with 2 -10" 70/80. I thought they sounded great (at least in this application). At one point I contacted Traynor about their speaker choice and got a personal email back from their R&D guy (who's name was Guy btw ) saying that they had trialled lots of speakers for this model, some way more expensive, but the 70/80's just sounded best with that amp.

...but this is getting ahead of myself.
It's called "forward thinking" now...