User manual ALTEC LANSING 288-8L HF DRIVER

[. . . ] In order to miniinjury, read entire owner's mize the risk of injury, damage, or hearing loss, please read the entire owner's before manual before connecting to a sound system. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN The lightning flash with arrowhead symbol, within an equalateral 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 equalateral triangle is intended to alert the user to the presence of important operating and maintenance instructions in the literature accompanying the device. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. APPA ATUS EARTHED WARNING: THIS APPA R ATUS MUST BE EARTHED THROUGH THE SUPPLIED POWER LINE CORD 3 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 1. INTRODUCTION The right to any claim against a public carrier can be forfeited if the carrier is not notified promptly and if the shipping carton and packing materials are not available for inspection by the carrier. [. . . ] For example, Channel 1 and Channel 2 together can provide stereo, mono, or bridged operation, completely independent of Channels 3-4 or Channels 5-6 settings. 7. 4 50Hz Low Cut Switch Each pair of channels has a 50Hz second order (12 dB per octave) low-cut filter option which is applied to both channels within the pair. When the switch is pressed, the audio signal is -3dB at 50Hz, -15dB at 25 Hz, -27dB at 12. 5Hz, etc. +- G Euroblock Connector System +- G 7 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier Model 6125A shown. Model 4200A has only four channels. 7. 5 Input Level Controls Input Level Controls attenuate input signal from 0dB down to -. For best performance, Altec recommends that the level controls be operated at full level (0 dB attenuation). In STEREO mode, each level control corresponds directly to the input signal on its respective channel. In MONO Mode, the input signal connected to channels 1, 3, or 5 are used to drive channels 2, 4, or 6 respectively, and the level controls for channels 1, 3, and 5 likewise control channels 2, 4, and 6. When switched to Mono mode, channels 2, 4, or 6 level controls become inactive. In BRIDGED mode, the level controls function the same as in mono mode. other input connection, as well as its level control. The first channel's input and level control now determines the signal to both channels. 7. 7 Dual Channel/Bridge Mode Switch Bridging a power amplifier is the process whereby two channels are supplied the same signal, with the second channel's phase inverted 180°. This is because the signal processing module, which processes both channels simultaneously, does not distinguish between the two channels within a channel pair when processing a fault. An AC power interruption will result in all channels entering protect mode simultaneously, just as if the amplifier is being turned off. 9 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier In all cases, the amplifier will restart the signal processing module after a short delay and will reconnect the speakers after several seconds if no further fault conditions exist. This allows the servo circuitry to bring any residual DC offsets to zero before speakers are connected. Specific conditions resulting in a fault are as follows: 8. 1 Power supply undervoltage - less than about 55 volts on the either supply rail. Possible causes would be total load on the outputs exceeding recommendations (remove some speakers - 4 load min, 8 min bridged), low AC mains voltage (reduce extension cord length or increase wire size, or switch to an AC mains circuit more capable of supporting the amplifier's power requirements), or improper AC inlet mains voltage setting (make sure nominal AC mains voltage matches the number in the viewing window on the AC inlet). 8. 2 Power supply overvoltage - more than about 92 volts on either supply rail. Possible causes would be high AC mains voltage (change to an AC mains circuit with voltage within the amplifier's stated requirements) or improper AC inlet mains voltage setting (make sure nominal AC mains voltage matches the number in the viewing window on the AC inlet). 8. 3 Output overcurrent - more than 15 to 20 amps being drawn from any output. Possible causes would be total load on the affected output exceeding recommendations (disconnect some speakers), or a short circuit on one of the outputs driven by the affected module (inspect speaker wiring for proper connection). The above conditions are checked by the signal processing module on a switching cycle by switching cycle basis and are therefore monitored as often as a million or more times a second, allowing protection well before destructive conditions have time to cause part failure. 8. 4 Heat sink overtemperature - a measured heat sink extrusion temperature of more than 85 to 90 degrees C. [. . . ] Conversely, two speakers connected in parallel will result in half the impedance, three parallel speakers a third the impedance, four speakers a fourth, and so on, assuming the speaker impedances are all the same. When using paralleled speakers, the available amplifier power for that channel is evenly divided among speakers, so 100 watts driving two parallel speakers of equal impedance provides 50 watts to each speaker, etc. 3. ) Thermal LED and Protect LEDs stay on: Amp module is in thermal protect mode and needs to cool. The fan will continue to run while in thermal protect, and other modules will continue to function. [. . . ]