10
GENERAL INFORMATION
Thank you for having chosen a PROEL product. HPX is a eries of power amplifiers designed to provide to entertainers and
audio professionals quality performance and maximum portability at a very affordable price.
Combining rock-solid power stages to extremely efficient
SWITCH MODE power supplies
, the HPX amplifiers delivers from
900W to 8000W of pure power to your speaker system, providing clear and defined highs together with extremely punchy
lows. All the models feature a true
2-ohm operation
, providing a cost effective power solution for the most demanding
sound reinforcement applications.
Thanks to the SMPS light-weight technology and to the efficient cooling systems, the HPX come in a very
compact and
portable package
, yet sturdy enough to provide the maximum protection and durability over the years.
HPX8000, feature a
CLASS I
power stage, providing very high power level in a highdensity structure. With an overall
efficiency higher than 75% and a comprehensive set of controls, including a 3-position GAIN selector, it represents a
cost-effective solution also for large sound reinforcement systems requiring very high power levels combined to top
quality performance.
The front panel, with very comfortable die-cast handles and
removable dust filters
, features a comprehensive set of LED
indicators together with detented level controls. The connections includes XLR for the inputs and the links, SPEAKON
and binding post for the outputs.
SETUP AND RACK MOUNTING
All HPX amplifiers will mount in two units of a standard 19" (48.3cm) rack (the front panel is provided of four mounting
holes). HPX amplifiers use a forced-air cooling system to mantain a low operating temperature. Drawn by an internal fan,
cold air enters through the slots in the front panel and flows over and through internal components, then the hot air gets
out from the rear panel slots (as shown on figure 1). The HPX amplifiers drive the fan using a variable-speed DC circuit,
which is controlled by sensing the heat sink temperature. The fan speed will increase only when the temperature of either
heat sink requires it, which keeps fan noise to a minimum and helps cut dust accumulation inside.
NOTE: In order to prevent the dust accumulation inside the amplifier, the two air vents on front panel have a dust filter.
Each time these filters are dirty (it depends on enviroment conditions) you have to remove the air slots using a phillips
screwdriver (as shown on figure 2) and clean the dust filter using compressed air or a soft brush.
Under extreme thermal load, the fan will force a very large volume of air through the heat sinks. If the amplifier overheats,
another sensing circuit shuts down the amplifier to cut off power until it cools to a safe temperature.
IMPORTANT: The exhaust hot air is forced out through the rear of the chassis (see figure). ABSOLUTELY DO NOT
OBSTRUCT THE FRONT AND REAR OPENINGS and always let them free from cables or other materials.
If the amplifier is rack mounted, make sure the exhaust air can flow without resistance from front to back side of the rack.
Therefore we suggest to use only rack stands with front and back cover completely removed (Proel KR10AD as example
for fixed installation or Proel CR series for touring use). In this case amplifiers may be stacked directly on top of each
other (no space needed between units), starting from the bottom of the rack.
We advise against the use of rack with closed backs (or close to a back wall), but if you can do otherwise, we suggest to
leave at least one standard rack space of opening between every two amplifiers and to make sure there is enough space
at the rear of the amplifiers to allow the air to escape (at least 15 cm or 6 inch).
FRONT PANEL (FIG.4)
1. Cooling vent
Removable cooling vent: always keep it clean from dust.
2. Power switch
Amplifier is "ON" when the switch is in the "I" position.
3. ON indicator
Green LED: when lighted indicates that the amplifier has been turned on.
4. Level control Channel 1
Rotary detented level control: in STEREO and PARALLEL operation it attenuates the level of the signal sent to the channel
1 of the amplifier, while in BRIDGE operation it operates as single control to attenuate the level of the signal sent to both
the channels.
The attenuation ranges from “
∞
” fully closed (the signal is completely attenuated) to “0” fully open, nominal level (the
signal is not attenuated in any way, so is fed to the amplifier channel at the same level at which it arrives on input).
5. Level control Channel 2
Rotary detented level control: in STEREO and PARALLEL operation it attenuates the level of the signal sent to the channel
2 of the amplifier. In BRIDGE operation it doesn't work.
The attenuation ranges from “
∞
” fully closed (the signal is completely attenuated) to “0” fully open, nominal level (the
signal is not attenuated in any way, so is fed to the amplifier channel at the same level at which it arrives on input).
