Preface
ENSONIQ DP/4+ Reference Manual iii
AC Line Conditioning
As with any computer device, the DP/4+ 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. The cheaper of the options, a surge/spike suppressor 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 using 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 the equipment
against excessively high or low line voltages. If you use the DP/4+ in lots of different
locations with varying or unknown AC line conditions, you might consider investing in a line
conditioner.
Guidelines for using the DP/4+
Temperature Guidelines
The DP/4+ contains a substantial amount of computerized and electronic circuitry that can be
susceptible to damage when exposed to extreme temperature changes. When the DP/4+ is
brought inside after sitting in a cold climate (i.e. the back seat of your car), condensation builds
up on the internal circuitry in much the same way a pair of glasses fogs up when you come inside
on a cold day. If the unit is powered up as this condensation occurs, components can short out or
be damaged. Excessively high temperatures also pose a threat to the unit, stressing both the
internal circuits as well as the case. With this in mind, it is highly advisable to follow these
precautions when storing, mounting and setting up your DP/4+:
• Avoid leaving the DP/4+ in temperatures of less than 50 degrees Fahrenheit or more than 100
degrees Fahrenheit.
• When bringing the DP/4+ indoors after travel, allow the unit at least 20 minutes to reach room
temperature before powering up. In the case of excessive outdoor temperatures (below 50
degrees Fahrenheit or above 100 degrees Fahrenheit), allow an hour or more before power up.
• Avoid leaving the DP/4+ inside a vehicle exposed to direct sunlight.
Rack Mounting Guidelines
Because the DP/4+ operates with an internal transformer, there is a certain amount of heat
generated by this unit. For better reliability, we recommend that you do not install this unit
beneath devices that are sensitive to heat, or above power amps, tube equipment, or other rack-
mount units that emit a lot of heat. We recommend leaving a space above the DP/4+, as well.
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