User manual HAFLER P7000

[. . . ] P7000 Installation & Operation ® ® ran t va no s U D AS ESIG SEM NE BLE D A D I ND NT HE SA PROFESSIONAL POWER AMPLIFIER AMPL NOTICE - IMPORTANT SAFETY INFORMATION CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN !! The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure, that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. the same three wire grounded connection. [. . . ] To use the amplifier in single channel, bridged mono applications, the front panel switch must be in the BRIDGED position. When the switch is set in the BRIDGED position, the Channel 1 (+) and (­) inputs are connected to Channel 2 in reversed polarity, which inverts the Channel 2 output. Only the Channel 1 input is used, and the speaker is connected to the two RED binding posts. The amplifier gain is adjusted by the Channel 1 level control; the Channel 2 control is not active. Because of thermal considerations we do not recommend using less than a nominal eight ohm load on the amplifier when running it in mono. XCARD CROSSOVERS The XCard modules contain the resistors and capacitors which control the frequency at which the card operates. The orientation of the card in the socket determines the operating mode of the crossover. The XCard is labeled to indicate the function of each face. The full range face is marked with a double arrow to show that both edges operate full range. The other face operates as either high-pass or low-pass and an arrow is printed by the function to indicate which edge to insert into the socket. When both cards are set full range, the full frequency response of the amplifier is used. When one card is set full range and the other for either high-pass or low-pass, the signal is crossed over at 12dB per octave with a Butterworth alignment at the frequency determined by the card which is used. When both cards are set for the same operation, whether it is high-pass or low-pass, the signal is crossed over at a 24dB per octave slope. When one card is set for low-pass and the other for high-pass, a bandpass crossover limits the signal to the frequency range determined by the cards which are used. The slope of the filter is 12dB per octave. There is no effect on the bandpass operation regardless of which of the cards is used for the high-pass or low-pass function. Assembled XCards are available at a variety of operating frequencies. Since there will be situations which the stock cards will not satisfy, instructions for building XCards for specific applications have been included in the Technical Reference section of this manual. ­4­ GROUND SWITCH Ground loops are characterized by a hum or buzz through the speakers and are caused by a voltage potential difference between two points in a ground circuit. Ground loops are aggravated when multiple paths exist for a given circuit. Mounting components in a rack with metal rails may introduce ground loops between associated equipment, because the rails can establish an additional ground path. The CHASSIS/FLOAT switch allows you to select the amplifier grounding scheme for best system compatibility. [. . . ] Wire Color Red Black Orange (two) White Red Blue White/Blue Blue (two) Function Audio Output Output Ground High Voltage AC High Voltage Center Tap High Voltage DC Positive High Voltage DC Negative Low Voltage Center Tap Low Voltage AC Terminal Red Binding Post Black Binding Post Bridge Rectifier AC CTI + Red ­ BLUE CT2 LV1, LV2 ­ 16 ­ BUILDING CUSTOM XCARDS The XCard crossover control modules used in the P7000 are a versatile and inexpensive method for configuring the amplifier for a wide range of system applications. The XCard eliminates the need for an external crossover or expensive plug-in accessories for multiple amp applications. By having the crossover built into the amplifier input circuit and with the XCard containing all the components controlling the operating frequency, it is very simple to customize to meet system specific requirements. Each amplifier, as supplied, has two 100Hz Butterworth aligned XCards each of which contains two resistors and two capacitors to control the crossover frequency. [. . . ]