Instruction Manual for DAC3 HGC and DAC3 L with 2.X Firmware Page 29
Headphone Amplifier Gain
(DAC3 HGC only)
The gain range of the HPA2™ can be set
using jumpers JP3 and JP4:
• Gain = 0 dB - see Figure 4
• Gain = - 10 dB - see Figure 5
(Factory Default)
• Gain = - 20 dB - see Figure 6
The jumpers change the gain of the HPA2™
headphone amplifier without changing the
output impedance. This keeps the output
impedance of the HPA2™ constant and very
near 0 Ohms. External attenuators should
never be inserted after a headphone amplifier
as this would change the output impedance
and alter the frequency response of the
headphones.
Proper gain settings are important for
maximizing the SNR of the headphone
monitoring system. With proper settings, the
full performance of the DAC3 can be
delivered to the headphones for critical
monitoring tasks and for maximum musical
enjoyment.
Tip: When the headphone gain jumpers are
set properly, a normal listening level will be
achieved at a VOLUME control setting above
the 11 o'clock position.
Tip: If a normal listening level is achieved
below an 11 o’clock VOLUME setting, the
headphone gain is too high, and the gain
should be decreased.
Tip: If the level is too low at the maximum
VOLUME setting, the headphone gain is too
low, and the gain should be increased.
Figure 4 - HPA2™ Gain is 0 dB
Figure 5 - HPA2™ Gain is - 10 dB
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