How does placement affect the HM-1s acoustical performance?
Because of its very small size, the HM-1 is highly sensitive to loading and its low-frequency performance benefits substantially from adjacent boundaries. In free space, the HM-1 is flat within 2.5 dB at one meter on-axis from 90Hz to 20 kHz, and -6 dB at 42 Hz. With half-space loading the HM-1 is maximally flat achieving 2.5 dB from 42Hz to 20kHz, and placement at a wall-to-ceiling junction or in a corner will yield further low-frequency boost. Where substantial low-frequency output is required in free field applications, an optional subwoofer can be used to achieve 2.5 dB response tolerance to 42 Hz with increased low-frequency acoustic power. The subwoofer employs a passive crossover network and is driven directly from a low-frequency amplifier output connector located on the HM-1 rear panel. With subwoofer, the systems maximum SPL output also increases to 120 dB at one meter.
