yoda-sama said:
It might be for the best to just sell off this set and put some money into a better all around setup. It’d likely be less headache in the end, and the sound quality would likely yield a noticeable improvement.

This is a legitimate consideration, and if you are going to sell off the old system, it’s always better to sell the whole thing as a full set now than to decide you aren’t happy with the speakers down the road and try to sell them after you’ve ditched the main unit and the sub (especially after you’ve chopped of their proprietary connectors).

I think it’s best to put in the forethought now, and if you do ever imagine you’ll sell it sometime in the future, you may as well do it now, since you’ll be able to recoup the biggest percentage of what you paid for it if you sell the whole thing together.

Of course, you could always try your current speakers with a new AVR and then if you decide you don’t like them, you can splice the old connectors back on and hope no prospective buyers will mind.