One way to measure the efficiency of a transducer is to measure the sound pressure created in a 2 cc test chamber for a fixed level of volt-amps. The unit of measurement used is volt-amps rather than watts as the phase angle between voltage and current often has little impact on the total power dissipation of the battery, amplifier, and transducer. In efficiency measurements, every three decibels (dB) represents a doubling of power consumption. The results of the measurements depicted in the graph shows that a dynamic speaker consumes six times more power than the RAB driver in a frequency range from about 300 Hz to 2 kHz. In in-ear wearables the total power savings resulting from the use of Balanced Armature drivers is dependent on the chipset power consumption in various operating modes. As chipset power efficiency improves, the audio transducer power consumption assumes greater importance.