The Facmogu A18021 3-inch full-range speakers are a practical choice for DIY audio projects. These 4-ohm drivers come as a pair, designed for flush mounting into custom cabinets or existing enclosures. The compact size—an outer diameter of 3.5 inches with a 2.79-inch cutout—makes them easy to integrate into bookshelf designs or multimedia setups without needing a lot of space.

Each speaker uses a 20mm voice coil and an anti-magnetic structure to prevent interference with nearby electronics. The frequency response spans 108Hz to 18kHz, which covers the core vocal range and most instruments with clarity. Sensitivity sits at 88dB, meaning they work well with amplifiers delivering 5 to 15 watts. The built-in three-band equalizer lets you shape the sound to your room or taste, producing a crisp, clean voice that suits both 2.0 and 2.1 configurations.

The main limitation is bass extension. These are full-range drivers, so they won’t rumble like a dedicated subwoofer. For a balanced system, pair them with a separate sub for low-end punch. Build quality feels solid for the price, and the flush mount design keeps the front clean. If you’re building a small, articulate speaker system for near-field listening or home audio, these deliver reliable performance without fuss.