English
7
connect a speaker system to the positive terminals
of the two outputs (see 4.5), the total power output
of the amp can be tapped for driving this speaker
system. For example, with the VX 2400, the total
output power is 2400 watts).
4.4 Limiter Button
The internal limiters of the VX power amp can be
switched off via this button. Pressing this button in
deactivates the limiters of both channels. The
internal limiters make the most of the available
power. They adapt the VX power amp to the current-
ly available dynamic headroom as precisely as
possible without exceeding the clipping threshold so
that the amp is not operated in a permanent state of
overload. However, the limiters do allow peak
impulses to briefly exceed the clip threshold. Both
the power amp and the connected speaker systems
can handle spikes well above the official power
output rating for continuous signals. Only when
these signal peaks exceed the threshold for a longer
period of time do the internal limiters dampen the
signals in order to prevent distortion in the output
signal of the power amp. This intelligent limiting
circuitry significantly expands the dynamic range of
the power amps. The only thing you have to do is
turn up the input level to a point where the Clipping
LEDs illuminate occasioally; the limiters themselves
automatically make the best possible use of availa-
ble headroom. What's more, you won't have to
worry about your speaker system because the
limiters ensure they won't be overloaded.
4.5 Outputs
Both binding posts and two four-pin Speakon
sockets are available for connecting speaker systems
(Pin 1+ = +; Pin 1– = –).
The Speakon socket A is designed for bridge mode
and biamping. For biamping purposes (e.g. with
active systems), the output signals of both power
amp channels are routed to the Speakon socket A
(Pin 1+ = Channel A+; Pin 1– = Channel A–;
Pin 2+ = Channel B+; Pin 2-- = Channel B --). In this
mode, the power amp is operated in two-channel
mode as always. The high frequency and low
frequency signals are routed separately to one power
amp channel each, but you only have to connect one
four-pin Speakon-cable to the speaker system.
In bridge mode, the speaker system is connected to
the positive terminals of both power amp outputs,
i.e. Channel A+ is connected to the positive terminal
of the speaker system and Channel B+ of the power
amp is connected the negative terminalof the
loudspeaker system.
Caution: If you want to connect a speaker system to
the power amp's Speakon
®
socket while the amp is
in bridge mode, then you must make a special
Speakon
®
cable for this purpose. The pins for the
two Speakon
®
plugs have to be connected as
follows: 1+ of the power amp to 1+ of the speaker
system and 2+ of the power amp to 1– of the
speaker system. The other pins remain unassigned.
4.6 Mains Socket
Connect the VX power amp via a standard (non-
heating equipment) power cable to the AC power
supply. However, before you plug the power amp
into a wall outlet, ensure that your local mains
voltage is the same as that specified on the back of
the unit near the AC socket. If you attempt to run
your VX power amp on the wrong mains voltage, you
can cause serious damage to the power amp!
4.7 Impedance Switch
(models VX 800 and VX 1200 only)
While the largest model in the VX series of power
amps is permanently set to a minimum load
(4
Ω
in the case of the VX 2400, and 2
Ω
with the
VX 2402), you can select the minimum impedance
of the smaller models with a switch. If the switch is
set to 4 Ohms, ensure that your connected load
does not fall below this value.
Caution: Do not under any circumstances change
this switch while the amp is in operation. Make any
and all changes only after turning the amp off.
VX_BDA_1_2a 21.08.2003 10:36 Uhr Seite 7 (Schwarz Bogen)
