Superlux HA3D - Manual (Page 8)

Operational Notes
Headphone outputs
The HA3D uses independent drive circuits for each of its three isolated headphone circuits. Because of the bi-polar power
supply, the HA3D can provide high levels of power to each headphone feed.
The HA3D is capable of driving headphones to harmful sound pressure levels. Take precautions to prevent hearing dam-
age.
Powering the HA3D
The HA3D operates on two AA alkaline cells for approximately 8 hours into 56 ohm head- phones (at nominal levels). The
audio performance of the HA3D does not vary throughout the life of the batteries.
Several factors affect battery life including: battery chemistry, ambient temperature of operation, headphone impedances,
headphone drive levels, and the number of headphones in use. The chart below can be used as a starting point to estimate
battery life. Experimentation is recommended to determine battery life for each individual setup.
Battery Type Operational Characteristics Battery Life
Popular alkaline powered, idle Approx. 15 hrs.
Popular alkaline driving 1, 56 ohm headphones at nominal level Approx. 8 hrs.
Popular alkaline driving 3, 56 ohm headphones at high levels Approx. 8 hrs.
(Test conditions: 25°C)
Battery Information:
Superlux recommends use alkaline or lithium batteries with HA3D for their higher capacity. Lithium provides more capac-
ity/longer operation hours, better low-temperature ability, and lighter weight.
Nickel-Cadmium batteries are not recommended in the HA3D since these batteries have lower capacity per cell than other
types and will result in very short service, and the benefit of higher rush current from these batteries are not needed to
operate HA3D.
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