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Zenith 13K2 Amplifier Manual 15
following schematics illustrate how the adjustable
VPL and Gain circuitry affect input sensitivity and
output power.
The chart to the follow of the drawing below show
input sensitivity for a 13K2 with a 8
Ω load and 195V
peak (max.) and 54V peak (min.) respectively for the
eight different gain stages b23dB and
+44dB. The resulting output power is displayed in
dBu, Vrms and watts in the tables to the far right.
- The headroom available through the input stage to
the clip limiter is shown by the dotted lines as +10
dB at 195V peak and +16.1dB at 54V peak. These
lines illustrate the additional signal level that can be
accepted at the input before any significant
distortion will appear at the input stage.
- If you use the level potentiometer in the signal
chain to reduce the level by an amount greater than
the headroom relative to input sensitivity, and you
drive the amplifier to clip level, you are in danger of
clipping the input stage before the current or voltage
peak limiters are activated.
- When bridging two channels, you must add +6dB to
the input sensitivity to achieve maximum output
voltage due to the automatic - 6dB gain
compensation inserted by the amplifier.
13K2 VPL and GAIN settings
7.4 Audio input and output
7.4.1 Balanced input connections
Audio inputs – two channel models
The XLR input connectors are electronically
balanced, and wired according to the IEC 268
standard (pin 2 = hot). XLR input connectors should
be wired as follows: