Guided Tour - Front Panel
1: Power switch - Use this to power the S1500 / S2000 on or off.
2: Power LED - Lights whenever the S1500 / S2000 is powered on.
3: Protection LED - This goes on for approximately five seconds whenever the S1500 / S2000 is
powered on and then turns off (you’ll hear a “click” when it does so). The Protection LED will also light
when overheating or other severe problems occur (see page 6 in this manual for more information). It is
normal for the Protection LED to fade slowly when the amp is powered off. When lit, 0 volts DC are
provided to all connected speakers, thus muting them and preventing any “thump” from occurring. For a
complete description of the conditions under which this light goes on, see the section entitled “The S1500
/ S2000 Protection Circuitry” on page 6 of this manual.
4: Channel input level controls - These 41-position detented knobs allow you to precisely adjust the
input level of the signal arriving at the rear-panel input jacks (see #7 on the following page). At their fully
counterclockwise position (labeled “-80 dB”), the signal is attenuated by 80 dB (essentially completely
off). At their fully clockwise position (labeled “0 dB”), the signal is at unity gain (that is, no attenuation).
When 0 dBu of signal arrives at the input jacks and the Channel input level controls are set to their fully
clockwise “0 dB” position, the S1500 / S2000 delivers full power output.
5: LED meters - These three-segment LED meters continuously monitor the power output level for the
corresponding channel. For convenience, the segments are labeled, from left to right, -40 dB, -20 dB,
and CLIP. The left (-40 dB) segment lights whenever input signal is present. The right (CLIP) segment
lights whenever the channel is outputting signal at full strength. For the best signal-to-noise ratio, the
right (CLIP) segment should light occasionally during peak levels; if it lights frequently, you may be
overloading the S1500 / S2000 and a distorted (“clipped”) signal is probably being output. If this occurs
and backing off the Input Level control delivers too low an output level for your application, consider
using Bridged mode (see the “Bridged and Parallel Modes” section on page 7 in this manual for more
information).
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