Frequency response of the HN-900, passive mode in left (purple trace) and right (orange trace) channels, active mode in left (blue trace) and right (red trace) channels, level referenced to 94 dB @ 500 Hz, passive mode response scaled down -10 dB for clarity.
The frequency response measurements in active mode indicate a fairly flat tonal balance, but the response above 700 Hz is unusually ragged. In passive mode, the midrange response drops by an average of about -5 dB, and a big resonance at 200 Hz appears.
