Gain structure and limiting, Equalisation, Rigging and safety procedures – Tannoy Professional Loudspeakers VXPSERIES User Manual
Page 4: Led functions, Audio connections
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Gain Structure and Limiting
The VXP gain structure is designed to allow a low-level source device
to drive the loudspeaker to full output. Maximum specified SPL will
be achieved with a 4 dBu input signal. There is sufficient headroom
in the signal path to accommodate input levels of 10 or even 20 dBu,
with high quality compression engaged as needed to maintain sonic
integrity without clipping.
Equalisation
The VXP loudspeaker requires no equalisation or correction to
overcome system limitations; equalisation is necessary only to
compensate for difficult acoustic environments.
Rigging and Safety Procedures
The installation of Tannoy Professional loudspeakers using the
dedicated hardware should carried out only by fully qualified
installers, in accordance with all the required safety codes and
standards that are applied at the place of installation.
WARNING: As the legal requirements for flying change from country
to country, please consult your local safety standards office before
installing any product. We also recommend that you thoroughly
check any laws and bylaws prior to installation. For more detailed
information on rigging hardware and safety procedures, please
consult the full VX Series and VXP Series Hardware Manual available
at www.tannoy.com.
LED Functions
Limit LED - When illuminated this indicates that the system is
approaching clipping. An occasional flicker of the red LED on the
loudest peaks is acceptable. If this LED remains red for more than
the duration of brief dynamic peaks, or lights continuously then the
system is being overdriven. If the red LED illuminates excessively:
• Reduce the input level (see interface panel)
• Reduce the output level of the mixer, or other source to the
speaker.
Signal LED – The Green LED indicates that a useable signal is
present at the input.
Power LED – When AC mains is connected to the speaker and the
power switch is turned on, the blue lower LED will illuminate.
Audio Connections
The signal input & link connectors are fully balanced. When
connecting a balanced signal be sure to wire to the following
standard:
SIGNAL
XLR CONNECTOR
Hot (+)
Pin 2
Cold (-)
Pin 3
Shield (GND)
Pin 1
In a standard balanced interconnection there are two signal
conductors and a shield. The shield is normally referenced to
ground at one or both ends. Many times the shield is lifted at one
end, usually at the input to eliminate “ground loops” or noise. This
should be done only as a last resort; although it will reduce hum,
the shields can act as radio antennas and pick up radio frequency
interference from the environment.
Multiple enclosures may be driven from a single audio source; simply
plug the signal source output into the first XLR input socket, and
patch that speaker’s XLR link to the next speaker’s XLR input socket.