Cones

The material a woofer cone is made from matters less than most of us think — and it matters differently than most speaker specs let on.

The cone's job is deceptively simple: move air exactly as told, without adding a voice of its own. Every material has a personality — a stiffness, a mass, and an internal damping profile — and every material makes trade-offs against those three axes. Paper is light and reasonably well-damped but can flex under load and change shape as it moves. Polypropylene is heavier and more damped than paper but sacrifices some of the responsiveness that lighter cones deliver. Aluminum and other metals are extremely stiff, so they move as a piston up to their breakup point, then ring above it if the crossover doesn't clean up after them. Kevlar, ceramic, carbon fiber, and various composites are all attempts to have it all — high stiffness with high damping and low mass — with varying degrees of success.

Here's what most cone material debates miss. The cone is only part of the puzzle. The motor behind it — the voice coil and magnet system — matters more (plus the suspension). Two woofers built from identical cone material can sound miles apart because the rest of the driver was engineered differently, and two woofers built from different cone materials can sound nearly identical if the designer chose the right pieces to work together.

So when a spec sheet tells you a speaker sounds a certain way because it uses X cone material, take it with a grain of salt.

The cone is what you see.

The design decisions around it are what you hear.