Everybody wants thrilling, deep bass but only a few have space for a traditional large-enclosure subwoofer in their trunk. The challenge, therefore, is for an up-to-date sub to be small but remain powerful – and Hifonics’ ZRX6D2 is exactly this. It uses a 6.5in coated paper-coned driver with ribbed surround for linear travel, and its compact die-cast aluminium frame houses a dual 2in voice coil and twin magnet assembly to provide a deep ±0.6in stroke. Requiring only a 15-litre cabinet, it easily outperforms much bigger designs. By creating maximum bass impact from a minimal footprint, the ZRX6D2 perfectly meets today’s requirements.