We use those larger terminals here at work and pump 5 to 8KW though them 24/7/365. The smaller terminals you listed will be fine for speakers and the nice thing about these terminal blocks is you can torque the screws down. That is a biggie for a low loss connection. Just don't over torque them as the impedance gets larger, not smaller, when you over torque. Do make sure those fork terminals will fit in the space provided, if not, you will need a larger terminal block. They are wider than they look!
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