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4 WELCOME
4.1 Introduction
Thank you for choosing the Zenith 10K4 Amplifier for
your sound reinforcement system. We are confident
that you will be pleased with the performance,
configuration flexibility, reliability, and long-term
durability offered by Zenith products.
This manual provides a comprehensive guide to the
features and functionality of 10K4 amplifiers. Please
read through it to become fully acquainted with the
many configuration options and multiple layers of
protection circuitry. To facilitate timely installation
and use of this 10K4 product, we have included a
Quick Guide Overview (section 6). This brief
summary, in conjunction with Installation (section 5),
contains the basic information needed to safely
install the amplifier and place it in service. However,
we highly recommend reading through this manual
in its entirety, beginning with Main Features and
Technologies and continuing through Operation and
Performance.
The power amplifier of 10K4 builds on the
foundation with the same sonic signature - powerful,
tight bass and transparent high frequency response.
In addition, the 10K4 amplifiers establish new
benchmarks for extremely high power and channel
density.
4.2 Main features
The 10K4 amplifier incorporates a number of
sophisticated technologies to ensure the best
possible performance and many years of reliable
operation. Familiarising yourself with these
technologies will prove invaluable in setting up and
optimising your loudspeaker system.
- CPL, (Current Peak Limiter) ensures that the
amplifier's Output does not exceed the safe current
handling parameters of amplifier components.
- Temperature protection is designed to protect the
amplifier from damage through excessive heat.
- VHF, (Very High Frequency) protection circuits mute
the output of the amplifier when non- dynamic
continuous signals above 10KHz are detected.
- DC protection ensures destructive DC signals will
not appear at the amplifier outputs. If such
conditions occur an internal fuse opens and fault
indication is displayed.
- Low-impedance (short circuit) protection pro - vides
a fault warning indication and shuts down the output
stage when, for example, an input signal is present
and a malfunctioning cable or driver is short
circuiting the output.
- High-impedance warning reports an alert when, at
the same time, output signal is high and no current
draw is measured. This situation might occur when
no speakers are connected, or when a driver is
blown.
- Low inrush current ensures that the mains breaker
will not trip when several power amplifiers are
turned on simultaneously.
4.2.1 Class TD amplifier and Regulated
Switch Mode Power Supply (R.SMPS)
Class TD technology combines the efficiency of a
Class D amplifier with the high sonic quality
associated with Class B designs. Class TD also
incorporates the same basic concepts behind Class
H designs, but here they are refined and pushed to a
higher level to achieve greater efficiency.
The Class TD output sections work with Zenith,
Regulated Switch Mode Power Supply (R.SMPS) to
create a superior overall power amplifier topology.
R.SMPS ensures stable, full output power over an
extremely wide range of mains voltage levels.
Sagging or fluctuating mains voltage will not affect
the power output delivered to the loudspeakers.
4.2.2 Amplifier gain structure
For greater flexibility in system Integration, 10K4
amplifiers allow gain adjustment from +23dB to +44
dB in 3dB steps. This feature accommodates any
combination of input device and loudspeaker type.
For example, if the input signal is weak, the gain can
be boosted to maintain maximum power output
while avoiding a poor signal-to-noise ratio.
4.2.3 Voltage Peak Limiter (VPL)
The Voltage Peak Limiter (VPL) feature allows user
adjustments that determine maximum voltage
output, thus matching the amplifier to the connected
speaker load. Regardless of load impedance, the
VPL feature can be set to ensure that neither
temperature nor current limitations are exceeded
before reaching the desired voltage threshold.
4.2.4 Protection and performance
optimisation
Appropriate and reliable power amplification is vital
to any audio system. Inadequate or faulty power
amplification could cause damage to the
loudspeakers or in some cases to the power
amplifiers themselves. To prevent any damage or
costly service interruptions, 10K4 amplifiers offer
advanced features to protect both internal circuits
and any connected loads. These features even
protect the mains fuse that, in extreme cases, could
be overloaded.
Zenith 10K4 Amplifier Manual
6
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