Okay but seriously, those passive radiators aren't even connected to anything. How important could they be?

We thought you'd never ask. What we have here is a reassembled Tap with a conspicuous absence of passive radiators. So how does it sound?

In a word, bad. Just for kicks, we ran a quick audio spectrum test with the passives out, and again with them in. Our puny human test subjects couldn't even hear the signal below 120 Hz—until we reinstalled the passive radiators, at which point they confidently identified a bassy rumble all the way down at ~90 Hz.

Good job, passive radiators.