Power Studio PWM-14000, Инструкция пользователя

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9
Precautions Introduction Front Panel Rear Panel
Operation and Performance
Amplifier Gain
Channel gain/level (front-panel pots)
Amplifier sensitivity
The PWM-14000 amplifier feature adjustable input gain. This versatility enables the
amplifier to accommodate a multitude of system configurations with various input
sources and speaker layouts. Amplifier gain is set globally for all channels. The
range is +23dB to +44dB in 3dB steps. Individual channel fine level adjustment is
available using the potentiometers on the front panel.
The unique adjustable input gain feature of the PWM-14000 makes it easier to attain
the optimum balance between headroom and signal-to-noise ratio in the signal path.
A weak signal at the input might require the gain to be raised in order to achieve
maximum output power with the lowest signal-to-noise ratio. A “hot” input signal,
however, would require a lowering of the gain to avoid sending the amplifier into
Voltage or Current clipping.
Individual channel gain (level) may be adjusted using the potentiometers located on
the front panel. Range is from 0dB to - infinity.

NOTE

If the level control is used to attenuate to a lower level than the headroom
relative to input sensitivity AND the amplifier input is driven into clip, there
is a danger of clipping the input stage before the current or voltage peak
limiters are activated.
Sensitivity is defined as how many Volts (rms) or dBu (referred to 0.775 Vrm) are
required to achieve full (maximum) output power. As the output power varies with the
load impedance, 4 ohms is usually the common reference. Since PWM-14000
amplifier is capable of providing multiple maximum output power levels through use
of the VPL feature, many sensitivity calculations may be required for a single
amplifier.
Output Voltage Peak Limiter (VPL)
Voltage Peak Limiter (VPL) is a unique feature in PWM-14000 amplifier. It is used to
select the maximum power available on each output channel. VPL levels are set
using the rear-panel DIP-switches; eight level positions are offered.
AMPLIFIER
PWM
-
14000