Audio Connections; Gain Structure; Limiters - Tannoy VXP SERIES Operation Manual

5. Operation

5.5 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.

5.6 Gain Structure

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. To avoid any compression, or when a lower SPL output is desired,
the input attenuator on the rear panel can be used to reduce gain/sensitivity.

5.7 Limiters

The limiters are carefully set-up to preserve the loudspeaker's dynamic headroom by allowing short term
transients to pass; audible degradation will only become apparent when the limit indication is on constantly.
The limiting functions will protect the amplifier from long term overheating by attenuating voltage to the drive
units. If used irresponsibly (constant hard clipping) sound quality will be compromised. In extreme cases drive
units may also be damaged.
10
VXP Series Operation Manual rev 1.0.2