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 representative, the hd Slim265, to the hd Infra221, the hd Sub series offers universally applicable and extremely powerful passive subwoofers for a variety of live and fixed installation applications.