MEASUREMENTS

used DRA Labs’ MLSSA system and a calibrated DPA 4006 microphone to measure the Callisto 6 C’s frequency response in the farfield, and an Earthworks QTC-40 mike for the nearfield and in-room responses. I fed the test signals to one of the speaker’s analog inputs. The volume control is deactivated with the analog input, and the DALI’s specified sensitivity with analog signals is 1.85V for maximum output. Pink noise with a level of 100mV RMS gave a sound pressure level of 91dB(B) at 1m on the supertweeter axis. The volume control is active with digital input signals