areas, as well as in major metropolitan areas, is not as dependable as one may wish, and a power conditioner such as the
APC S20 can really help protect your AV gear while assuring peak performance.
So let’s look in a little more detail at what one really needs for AC power control and protection in a home theater audio
video system and how the S20 addresses these needs. The various things one might want in such a power controller are:
1. Sequenced on/off and remote control of power to various components
2. Battery backup
3. Voltage regulation
4. Surge, spike and over-voltage protection.
5. Line noise filtering
6. Environmental monitoring
7. Communications and control
Sequenced and Remote Power Control
Sequenced control of AC power to various components is desirable in that you want source components and preamplifiers
to be stable before turning on power amplifiers. Otherwise if the amplifier is live as source components turn on, one may
get annoying, and potentially damaging “pops” going to the speakers.
The APC S Type Power Conditioners have four output banks of AC outlets that are turned on and off sequentially, two
of which are delayed on system turn on by an adjustable time of up to 10 seconds.
Sequenced on/off is fine for turning the WHOLE system on or off, say from the front panel on/off button. Unfortunately,
that is not what is needed for normal daily use. In practice there will typically be one or more components that you will
wish to always have powered on, e.g. a video recorder like my DISH DVR, so that programs can be recorded while the
rest of the system is “off”. Other components are likely best left powered on, but in standby mode. You will want all
these components protected by surge suppression, battery backup, etc.
So, in practice the best strategy is likely to leave the power connected to most components and to turn the system on and
off using the typical on/off sequencing available with a well-programmed universal remote control. There may be some
components, however where there is not a standby mode, or as in my case, where that standby mode uses excessive
power. In such cases you will want to control AC power to those components by remotely controlling the individual
banks on the power conditioner.
Remote control of the various outlet banks is one area where the S20 and the S15 differ. With the S20, each of the four
banks can be switched on and off via RS-232 control. The S15 allows control of the banks via two 12V triggers. Thus
the S15 will be easier to integrate into system that have 12V triggers available, but not RS-232 control.
Battery Backup and Voltage Regulation
Power supplies in AV components are designed to work with a certain range of input voltages. Lets say a power supply
for use in the United States is designed to work at 117 Volts, and may work efficiently with a line voltage of, for
example, 105 to 130 Volts. If the input voltage to the component drops below 105 V then the power supply will not
work as designed and potentially have a much harder time keeping up with the demand for power.
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