Say it loud with this 4", 8-Ohm 3W speaker with a 1/2" voice coil, 3/16" mounting holes, 9" leads and a 2-pin Molex connector.

The mightiest mites of all, piezo elements. These are mounted in a 9/16" dia x 1/4" thick housing with a pair of 3/16" radial leads. The positive lead is marked.

Literally. This 6 watt, 6 ohm speaker is from Sharp Corporation. The speaker is 4-3/8" x 2" oblong with (4) mounting holes, a paper cone and a 1-7/8" dia voice coil.

This 4" 10W 8-Ohm speaker with a more-attractive-than-usual white metal grille with rounded corners was made for an intercom, we think. Has a 1-1/4" dia voice coil, ceramic magnet, and polyester cone. It's a squarish 4" that's 2-1/4" thick. Includes mounting hardware.

This Motorola Golden Voice speaker is vintage, we're just not sure what vintage. Based on its shape, we think it's from a car radio. What we know for sure is that it has a 4-Ohm impedance, measures 4" x 10" x 2" deep and is mounted on particle board that measures 4-3/8" x 11-1/4" with mounting tabs on the long ends. Voice coil is 1-1/8" and it has a pair of quick-disconnect terminals. No wattage rating but our vintage speaker expert (old, but still working) says it'll be OK for up to 10W or so. Made right here in the USA, so you know it's vintage.

From the world before Twitter, this 3" speaker from Foster® is rated 2W at 8 Ohms. It's a tweeter, not a woofer. Has a 3/4" voice coil and is 1-3/16" thick with a pair of 1/8" quick-disconnect terminals for input. Because man cannot live on low notes alone.