User manual PROEL HP-D 3000

[. . . ] Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. [. . . ] D1500 with two indipendent channels, parallel or bridge configurable, fully made with switching technology with output stages in class-D shape. D3000 with four indipendent channels, configurable as two parallel or bridge amplifiers, fully made with switching technology with output stages in class-D shape. All models are fitted in 2 standard rack unit and are equipped with a Soft Clipping limiter that gives an undistorted output signal in any input signal condition. To make the best use of these amplifiers, please read the manual thoroughly before operating. 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. The HP-D 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) 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. 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 advice 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). NOTE: The HPD2000 and HPD3000 amplifiers are respectively the double versions of HPD1000 and HPD1500 amplifiers, so the instructions for channels 3 and 4 are the same of channels 1 and 2 respectively (see also both front panel figures). Removable cooling vent: always keep it clean from dust. Blue LED: when lighted indicates amplifier has been turned on and AC power is available. 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. nOTE: Whenever possible , use always balanced cables. Unbalanced lines may also be used but may result in noise over long cable runs. [. . . ] â· Make sure the mains plug is securely plugged into mains AC outlet. Is the SPEAKON cable connector locked into the right channel power output socket?If not check if your signal level is too low or check the signal cable, mixer and other equipment setting and cabling. No Sound and Protection trip (LED PROTECT always on) â· Could be a possible short circuit at the amplifier loudspeakers outputs, the speaker's inputs or in the cabling. [. . . ]