To run a sub or not is completely subjective. If you have a small room the HT1s may provide enough bass. I think the HT1s may extend low enough not to warrant a sub, but I have never heard them so I am just speculating. Listen to them both ways and see what you prefer. There really is no right or wrong.
Man, I think a lot of people would like to read a comparison of Axioms vs. Salks. Pics are a must when you get your new speakers.
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I find Jim's work breathtaking.
By the way, which Axiom speakers do you own?