You will need a crossover. You don't want to push high frequencies to the sub, and you want to filter the sub's frequencies out of your other speakers. Since you're not going to bi-amp, you'll want a ...

I recently obtained a pair of JBL HDI-1600 speakers. These are the nicest speakers I've ever owned, and I would like to get the most out of them. I have an old Harman-Kardon PM640 integrated amp for ...