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power supply
power supply - dual
powering the HPW
There are 4 distinct ways to power the HPW:
1) Internal Supply ONLY
2) Internal Supply PLUS an External Supply as a Redundant Supply
3) Internal Supply PLUS an External Supply as a Back-Up Supply
4) External Supply ONLY
# 1 is the default powering method. The HPW comes equipped with an Internal Supply and line cord.
# 2 and #3 differ only in their implementation. Both depend on an external supply (plus DC cable) to take over
if the internal supply fails, but differ in the philosophy behind their operation.
For method #2, the External supply is always connected to the HPW and is powered-up whenever the HPW’s
internal supply is on. If the internal supply fails, the external supply takes over immediately without any operator
intervention or audio interruption. The same thing happens if the external supply fails; the internal supply keeps
the console operating. Basically, you have two supplies powering the console. If either of the supplies fail, the
other continues to operate.
For method #3, the external supply is connected to the HPW in the same way as #2, but the supply is
switched OFF. If the internal supply fails, the external supply is then switched on. This requires the operator to
manually perform the switch over. During the down-time, the console stops working, and there could be a dis-
turbing POP when the power comes back on.
Choosing method #2 or #3 comes from one’s belief as to what’s more likely to happen:
A) An internal failure of a power supply from a general component fault
OR
B) An overall AC power-related problem that causes a supply to fail.
If you believe A is more likely, then use method #2. You are keeping both supplies always on-line to cover for
one another. The switch-over is seamless, so the only way to later check for a faulty supply is to try to run the
console on the internal or external supply only. The External supply does have its own set of status LEDs.
If you believe that you’re more likely to encounter AC power-related problems severe enough to fry a supply,
use method #3 and keep the back-up supply switched OFF until you need it. (Some users go as far as not even
plugging the supply into the power strip until they’re sure that the power is restored and good).
Our recommended method is #2. The supply (both external and internal) is designed to operate from 100 to
240 volts without a problem. In fact, it can handle 260 volts input and stay within spec. It is unlikely that an input
overvoltage condition will cause the supply to fail. By keeping both supplies on at all times, audio continuity is
maintained if one of the supplies fail.
Method #4 was listed as a possible way to power the HPW: External supply only. Typically, this method is only
used in the event of an internal supply failure. You can still operate the unit until an internal power supply
replacement is obtained. The internal, failed supply should be switched OFF and no AC line cord should be fit-
ted. If an internal supply fails, it is unlikely that it will interfere with the External supply’s operation.
NOTE: You will NOT get better noise, distortion or overall performance gains from the HPW if you power it
from an external supply. This may be true for some other brands of consoles, but the HPW was designed for full
performance even when operated from its internal supply.