The most defining design difference between these two speakers is sheer size and portability. The JBL Flip 7 weighs 560 g and occupies roughly 907 cm³, making it a genuinely pocket-friendly, grab-and-go device. The Marshall Middleton II, by contrast, tips the scales at 1800 g — over three times heavier — and takes up nearly 2479 cm³. This is not a subtle difference; it fundamentally shapes where and how you use each speaker. The Flip 7 is built for backpacks, bike rides, and beach bags, while the Middleton II is more of a portable home speaker you carry intentionally, not casually.
On water resistance, both are rated waterproof, but the Flip 7 holds a meaningful edge: its IP68 certification covers submersion down to 1.5 m, versus the Middleton II's IP67 rating at 1 m. In practice, both handle rain, splashes, and poolside use comfortably, but the Flip 7 offers slightly more peace of mind in and around water. The Middleton II does include a neodymium magnet — a driver component associated with stronger magnetic flux and potentially more efficient audio conversion — though its acoustic impact cannot be judged from design specs alone. Only the Flip 7 offers a detachable cable, a small but useful convenience for charging flexibility.
Both speakers share a control panel placed directly on the device, and neither offers a touch screen, RGB lighting, a remote control, or an included travel bag — so those categories are evenly matched. Overall, the Flip 7 has a clear design advantage for portability and water protection, while the Middleton II's bulk suggests it is positioned as a higher-output home-to-patio speaker rather than a true on-the-move companion.