Functions And Settings; Introduction; Operation Precautions; Signal Flow And Head Room - DAD FZ10004 User Manual

- 3 - FUNCTIONS AND SETTINGS

3.1 INTRODUCTION

The following sections provide comprehensive information on amplifier connection, setup, operation,
and performance. The detailed information included here is essential to realizing the full functionality of
the amplifiers.

3.2 OPERATION PRECAUTIONS

• Make sure that the Power switch on the amplifier front panel are set to off before making any input,
output, and also before manipulating the DIP-switches on the rear panel.
• Make sure that the AC mains voltage is correct and matches the voltage printed on the rear panel of
the amplifier (110V or 220V).
• Make sure that no signal is present at the input to the amplifier when powering up. An input signal
could produce an unintentionally loud initial volume from the speakers.

3.3 SIGNAL FLOW AND HEAD ROOM

Signal flow blocks
The input stage of amplifiers has a high sensitivity to provide ample system headroom. This in effect
means that the input stage is almost impossible to clip.
Overall amplifier input gain is adjusted using the input stage DIP-switches. Please note that the gain set-
ting is global, affecting all channels. Following the input stage, the dedicated level control on each chan-
nel allows signal attenuation from 0dB to minus infinity.
The Current Peak Limiter (CPL) section dynamically limits the input signal based on three parameters:
sensed current level, feedback from the output stage, and sensed voltage clip from the VL (and output
amplifier voltage clip if Soft Clip is activated). This ensures that power output is maintained within the
design limits of the amplifier.
The adjustable Voltage Peak Limiter (VL) sets the maximum output voltage and therefore also the maxi-
mum output power. Eight different voltage stages are available using the DIP-switches on the rear panel
of all models.
The sophisticated output section monitors faults and generates appropriate warnings, which are dis-
played on the amplifier front panel. In the rare event that conditions are extraordinarily severe, the ampli-
fier will shut down until the fault or problem setting has been rectified or adjusted. These sensing circuits
are also employed to feed back voltage and current level information, via a side chain, to the limiters.
Sensing circuits also transmit local amplifier module temperature and power supply temperature to the
appropriate protection mechanisms. Read the Protection, Faults and Warnings section for further details.
FZ10004
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Fig.9