Harmonic Design subwoofers use advanced technologies in component design, acoustics and signal processing for extreme bandwidth, tonal consistency and impulse accuracy.

The hd Sub-Series includes tailor-made passive subwoofer solutions for the perfect complement of full-range loudspeakers, as well as the now ubiquitous column speakers and LineArrays. From the smallest, the hd Slim265 to the hd Infra218, the hd Sub-Series offers universally applicable and exceptionally powerful passive subwoofers for a variety of live and fixed installation applications.