Rear-Panel
3. Gain Switch
The Nucleus amplifier features a gain configuration switch allowing for more use versatility
from various headphones. This switch allows for two different gain settings. In the bottom
(Lo) position the amplifier is configured for approximately 6dB of gain. In the upper
position (Hi) the amplifier is configured for approximately 14.6dB of gain. Never operate
this switch when playing and listening to music. Always operate this switch with the
volume control set at minimum. Please note that this switch affects the gain on both
the headphone and pre-amp outputs.
4. Input Connectors
The Nucleus amplifier offers two analog inputs which are selectable by the input selector
switch on the front-panel. These two inputs are the same and are switched by a high-
quality relay. These inputs accept standard line-level analog signal sources, ie…output
from an iPod, iPad, computer analog audio, CD player, mobile phone or any high-end audio
source component. Please note that left signal sources should be connected to the left
(white) channel jacks and that the right signal sources connected to the right (red) channel
jacks. Never connect any source signal other than a line-level analog signal to these
connectors. Doing so may damage the amplifier and void the warranty.
5. Pre Out Connectors
The Nucleus amplifier offers a preamplifier output. This allows the Nucleus to be used as a
high-quality preamplifier which can be connected to a pair of desktop powered speakers
or an external stereo power amplifier for use in a high-end system. These pre-amp out
connectors offer the same gain configurations as the headphone output does. The output
from these jacks is controlled by the front-panel’s volume control and mute switch. They
feature a line-level analog output signal with a source impedance of 75-ohms. The left
channel jack (white) should be connected to an amplifier’s left channel input jack. The
right channel jack (red) should be connected to an amplifier’s right channel input jack. For
best results, we recommend using better quality RCA to RCA interconnect cables for these
connections. Never connect anything else other than an external amplifier’s input to
these connectors. Never short circuit these connectors as doing so may damage the
amplifier and void the warranty.
