SPL TwinTube, Руководство пользователя

Страница: 14 / 52

14
Analog Elemental Series
Rear Panel | Connections and Switches
Signal Connections
Turn off the unit before connecting or disconnecting any cable or equipment to it. Otherwise
you risk the possibility of damaging your ears or equipment.
Input and Output Electronics
The input and output electronics are based upon bridge circuits that keep the signal flow
constant, regardless of malfunctioning equipment and power outages (power fail safety
by relay hard bypasses). The bridge and insert circuits rely on high-quality relays. Contact
surfaces are gold-plated to provide better conductivity and encapsulated to avoid external
influences due to climate or atmospheric conditions.
XLR sockets
All signal connections are made via balanced XLR connectors. Inputs are always female and
accept male connectors; outputs are always male. All in all, a very comprehensible principle.
Balanced connections
It is impossible to exclude interferences when a single audio signal is transmitted. Shielding is
effective against electric, but not against electromagnetic influences. Motors, transformers,
and alternating current can always induce interferences. But even if the transmission would
succeed, differences in ground potentials between driver and receiver would produce distur-
bances.
In balanced connections a reference signal with reversed polarity is transmitted additionally
to the audio signal through a second wire. The ground signal is routed separately through
a third wire. Input and output stages are drivers and receivers, and the receiving stage can
suppress interferences by subtracting the difference between audio and reference signal.
Unbalanced connections
Unbalanced connections from and to RCA or 1/4“ TS sockets can be made without adaptors to
the balanced XLR sockets. The correct wiring is important. The diagram shows the pin config-
uration of the XLR sockets and how to correctly connect them for unbalanced connections:
Connections to RCA sockets are always unbalanced, a wiring to jack connectors can be both
balanced (1/4“ TRS/stereo jack) or unbalanced (1/4“ TS/mono jack). We recommend to use
individually configured cables from XLR to RCA or jack sockets instead of adaptors. You can
get cables in any needed configuration from audio dealers. With the diagram above, the
dealer can ensure to provide the appropriate cable for your application.
Input Output
balanced unbalanced balanced unbalanced
1=GND
2=hot (+)
3=cold (-)
1
2
3
1
2
3
1
2
3
1 2
3