Matrix Audio HPA-3B - Manual (Page 6)

Settings & Usage
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Power On/Off
Connected the power plug to the HPA-3B, turn on the power switch, the
working LED indicator will light up about one second, then the HPA-3B will
enter the working status.
Input Channel
You can use standard XLR cable connect with the HPA-3B and also can use
the accessory adaptor plug connect with the HPA-3B via RCA cable .
Gain Control
The gain switch on the front panel, can set the gain at 5dB, 10dB or 20dB.
Volume Control
Using the volume knob to adjust the volume, to avoid excessive volume
causes hearing damage, please make sure the volume knob on the suitable
position before power on.
Headphone Output
There have a 4-pin XLR headphone jack and a 1/4" headphone jack, can be
connected a balance headphone and a mono headphone at same time.