ENSONIQ DP/2 User's Guide Page 17

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1—Introduction
ENSONIQ DP/Pro Reference Manual 9
from being “spit” out of the transmitting device during power up, which could confuse or disable
your DP/Pro. If this should happen, turn off the DP/Pro, and then turn it back on.
Polarization and Grounding
Like many modern electrical devices, the DP/Pro has a three-prong power cord with earth ground to
ensure safe operation. Some products have power cords with only two prongs and no earth ground.
For safety, some of these products have polarized plugs which can only be inserted into an outlet the
proper way.
PolarizedNon-polarized
Three-prong
with earth ground
Some products, such as older guitar amplifiers, do not have polarized plugs and can be connected to
an outlet incorrectly. This may result in dangerous high voltages on the audio connections, which
could cause you physical harm, or damage any properly grounded equipment to which they are
connected, such as your DP/Pro.
To avoid shock hazards or equipment damage, we recommend the following precautions:
If you own equipment with two-pronged power cords, check to see if they’re polarized or non-
polarized. You might consider having an authorized repair station change any non-polarized
plugs on your equipment to polarized plugs to avoid future problems.
Exercise caution when using extension cords or plug adapters. Proper polarization should always
be maintained from the outlet to the plug. The use of polarized extension cords and adapters is
the easiest way to maintain proper polarity.
Whenever possible, connect all products with grounded power cords to the same outlet ground.
This will ensure a common ground level to prevent equipment damage and minimize hum in the
audio output.
AC outlet testers are available from many electronic supply and hardware stores. These can be used to
check for proper polarity of outlets and cords.
For more information on grounding the DP/Pro, see Chapter 12.
AC Line Conditioning
As with any computer device, the DP/Pro is sensitive to sharp peaks and drops in the AC line voltage.
Lightning strikes, power drops, or sudden and erratic surges in the AC line voltage can scramble the
internal memory, and in some cases, damage the unit’s hardware. Here are a few suggestions to help
guard against such occurrences:
A surge/spike suppressor—this absorbs surges and protects your gear from all but the most
severe over-voltage conditions. You can get multi-outlet power strips with built-in surge/spike
suppressors for little more than the cost of unprotected power strips, so purchasing one is a good
investment for all your electronic equipment.
A line conditioner—this is the best, but by far the more expensive way to protect your gear. In
addition to protecting against surges and spikes, a line conditioner guards equipment against
excessively high or low line voltages. If you use the DP/Pro in lots of different locations with
varying or unknown AC line conditions, you might consider investing in a line conditioner.
Rack Mounting Guidelines
Because the DP/Pro uses an internal transformer, it generates a certain amount of heat. For better
reliability, we don’t recommend the installation of the DP/Pro near devices that are particularly
sensitive to heat, or near power amps, tube equipment, or other products that emit a lot of heat.
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