Unika TD-14000, User Instructions

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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 TD-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 +23 dB to +44
dB in 3 dB steps. Individual channel fine level adjustment is available using the
potentiometers on the front panel.
The unique adjustable input gain feature of the TD-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 a lowering of the gain to avoid sending
the amplifier into Voltage of the gain to avoid sending the amplifier into Voltage or Current
clipping. See Appendix to review the table containing Gain verus VPL setting implications
for input sensitivity and output power. Bridge mode operation automatically compensates
by -6 dB, keeping all channels at the same gain.
Individual channel gain (level) may be adjusted using the potentiometers located on the
front panel. Range I from 0 dB 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 I 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 TD14000 amplifier are
capable of providing multiple maximum output power levels through use of the VPL
feature, many sensitivity calculations may be required for a single amplifier. We
recommend use of the DeviceControl software to simplify this process. DeviceControl’s
Device Viewpage, used in combination with the DIP-switch settings display, will
automatically produce a sensitivity calculation from the given data ( VPL, Gain and load).
Output Voltage Peak Limiter(VPL)
Voltage Peak Limiter (VPL) is a unique feature in TD14000 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
TD
-
14000