10
Chapter 2
Front & rear panel
Front panel overview
Front panel description
Input mixing controls:
Using the input mixing controls, the individual level for each input can be adjusted. Each
input control is provided with a clip indicator LED which illuminates when the maximum level
(clipping) is almost reached. To ensure the best signal-to-noise ratio, illumination of this
indicator should only occur at peak levels. When it illuminates frequently, the channel will
be overdriven and a distorted ‘clipping’ sound will occur.
Signal routing selection buttons:
The signal routing buttons located on the right side of each input mixing control (indicated
with ‘Z1’ and ‘Z2’ for PRE220 and ‘Z1 to Z4’ for PRE240) are used for selection for routing
each input to one or both output channels. Press this button to enable the input routing to
the corresponding output. The corresponding routing indicator LED illuminates when routed.
Bluetooth (CH1):
The integrated Bluetooth receiver is mixed with channel 1 and contains a pairing button
besides the input mixing control. This allows connection of the pre-amplifier with any
supporting audio source device such as smartphone or tablet. The LED positioned beside
this button indicates the current operation mode. When non illuminating, the device cannot
be discovered by (new) Bluetooth devices. When blinking, the device is not connected but can
be discovered through Bluetooth devices, and when illuminated it is connected and doesn’t
allow pairing with another device.
