TL;DR: The Pocket Popper is a magnetic mini wireless speaker that's on sale for only $21.99 (reg. $24). There's a lot of room between weak phone speakers and big ol' bass-boosted party speakers.

NO one is better fitted than Dr. du Bois to write a treatise on the magnetic circuit. He is well known for his experimental investigations in magnetism, and abstract magnetic theory is clearer and ...