CPD
14
|FULLRANGE
CPD
14
|Manual
P A G E
|
7
The 1 3/4 "ring diaphragm of the tweeter driver is made of Mylar which produces significantly less
harmonic distortion than comparable metal diaphragms. The remaining two amplifiers provide
RMS power to the 5 "midrange drivers per 250W and the 1 3/4" ring diaphragm driver.
Unique is the construction of the high frequency waveguide/horn and its electronic adaptation to
the four midrange drivers. The result is a vertically narrow beam angle, whereby the vertical
curving of the wavefront also continues in the range of the cut-off frequency and cannot detect
any losses there. With correct positioning of the loudspeaker, all listeners are therefore provided
with the same direct sound and unwanted sound energy in the room is reduced.
POWERAMPLIFIER OUTPUTS
The DSP controller uses FIR filtering technology for true-to-noise playback. Three built-in amplifiers
deliver 100W RMS power to the 10 "500W woofers, the 5" midrange drivers 250W and the 1 3/4
"ring diaphragm driver - peak power is over 1.5kW!
POWERSUPPLY
A modern wide-range switching power supply with power-factor correction is used here. When
mounting the heavy components, the strong vibrations of the bass speaker were taken into
account. Separate control circuits are available for the power supply of the controller electronics.
COOLING
Power amplifiers generate dissipated heat that would destroy the semiconductor devices unless
sufficient heat dissipation is provided. The dissipated amount of heat depends on the generated
NF-power and the used amplifier technology. Since a fan noise would be annoying in a relatively
quiet environment, the
CPD 14
has 2 power amplifiers in PWM technology and a large convection
heat sink.
DRIVER PROTECTION
In normal operation state the speakers are limited by the DSP controller to safe levels. Only if the
CPD 14
is switched on the output is briefly undefined, which is why they are switched on delayed
via a mute circuit, in particular for the protection of the sensitive high-frequency drivers. If the DC
current changes by more than 0.5 V, a special detection circuit disconnects the speakers from the
amplifier for their protection. The same protection takes place if electrical shortage or low
impedance occurs. When the cause is remedied, the circuits return to their full operational status. If
the internal heat increases above 85° C (185° F), protection is engaged to deactivate the power
amps for as long as it takes to reduce the temperature to 85° C (185° F) again.
INPUT
The
CPD 14
has an electronically balanced input. Relative to membrane movement of the woofer
at 100 Hz, pin 3 is the "positive" and pin 2 is the "negative" contact. To achieve optimum
impedance symmetry and thus maximum interference immunity of the supply line, KS has
developed a special amplifier stage. In case of an asymmetrical feed line, both pin 2 and pin 3 can
be used as a "hot" connection, depending on the desired phase position. The impedance is 10
kOhm, the maximum level is 22dBu. Undesired DC voltages are kept away from bipolar coupling
capacitors. For particularly critical installations, e.g. different power supplies and long signal lines,
the output of the mixer should be carried out symmetrically.
DANTE OPTION
The
CPD 14
officially speaks DANTE. The optional DANTE card enables uncompressed transmission
of low-latency digital audio over long distances and to multiple locations. Adding a Dante option
card to your KS product makes your audio routing even easier and more convenient. Perfect for
delivering audio in excellent quality.