I recently replaced a blown tweeter on one of my studio reference monitors (parts available on full compass.com). Before that, I never really gave the speaker's innards much thought. It's Interesting to see this cross-section.
Always wondered what's inside a Bose Acoustimass Speaker System, 2 woofers in 'tandem' in an internal closed box, helping each other. A sealed enclosure delivers a more refined bass. Here combined with 2 ports.