HK Audio CDR 210 F - Manual (Page 86)

Manual
COHEDRA
® & COHEDRA ® Compact
VX 2400
The VX 2400 is a dual channel power amplifier fea-
turing integrated protective and monitoring circuits
and the associated display and control features.
The signal inputs of the VX 2400 are electronically
balanced. Input impedance is 20 k-ohms balanced
or 10 k-ohms unbalanced. Input sensitivity amounts
to 1.4 RMS. Both inputs are provided with filters to
protect against stray HF pickup.
Each of the VX 2400's two channels produces
1200 watts RMS of continuous power at an impe-
dance of 4 ohms, and 750 watts RMS continuous
power at 8 ohms. In the event of transient impulses
(for example, percussive signals) at an impedance
of 4 ohms, the amp can develop peak output levels
ranging up to 2,000 watts per channel depending
on the duration of the spike.
The VX 2400 accepts 230 V mains voltage and
50 to 60 Hz line frequency. In accordance with the
VDE 0860 and IEC 60065 norms, the power amp
will continue operating soundly at voltage fluctuations
ranging up to 10%. The VX 2400's circuit breaker
trips when the incoming mains voltage exceeds the
permissible limit. The VX 2400's power consumpti-
on according to IEC 60065 is 1800 watts.
The power consumption specification is an average
value; actual power consumption can intermittently
peak at 4,000 watts. Make sure ample voltage is
available. Particularly when operating the power amp
near or at full power, always ensure the fan and ven-
tilation ducts remain uncovered and unobstructed,
ensuring sufficient ventilation and cooling.
1 Protective Circuits
The VX 2400 is equipped with circuits protecting
it against DC voltage at the output, excess current
(short circuits), and thermal overload (overheating).
The Protect LED lights up when a protective circuit
activates (see chapter 4). When a protective circuit
shuts the amp down, it switches back on automati-
cally as soon as the problem has been eliminated.
Failure to do this indicates that there is an internal
defect. In this case, have a qualified service techni-
cian examine the VX 2400.
2 Limiter
The VX 2400 features an intelligent circuit that limits
the level of the input signal according to the amount
and duration of overload. This extends the power
amp's useful dynamic range considerably.
Important note:
If you use the HK AUDIO
® Digital Field Controller
(DFC) in combination with the VX 2400, be sure
to switch the VX 2400's limiters off. Otherwise,
the DFC's Overshoot limiter will not work. Also, be
sure to switch the VX 2400' limiter off when using
the HK AUDIO
® AC22 Controller (for example, for
monitoring purposes).
3 Fan
A temperature controlled, DC-powered fan cools the
VX 2400. It draws fresh air from the front, sucking
it through a dust filter and expelling the warm air
through the back vents.
Important note:
Check the dust filter regularly and clean when
necessary. If the dust filter is clogged with dirt, the
amp will not be cooled sufficiently.
Figure 1: VX 2400 front view