Assessments - 3, GPA: 4.3
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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. 8 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 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. 7.6 Stereo/Mono Switch The 6125A is comprised of three stereo amplifiers (two on the 4200A), each operating independently of the others, with Stereo/Mono switching available for each channel pair. If this switch is set to Stereo mode, the channel pair operates as two discrete amplifiers, each with its own input connection and level control. Switching to Mono mode allows one input (channel 1, 3, or 5) to drive both channels of a stereo channel pair. Pressing the Mono switch disables the channel pair's 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°. The speaker is then connected across the (+) output connections of each channel, resulting in twice the power to the speaker that either channel could deliver by itself. Since in Bridge Mode both connections have voltage present, never connect or touch either speaker wire to ground. The 6125A is capable of three channels of bridged output (two channels on the 4200A). To use bridged mode, first press MONO from the Stereo/Mono switch on the channel pair to be bridged. This sends the same audio signal to both channels. Then press BRIDGE from the Dual/Bridge switch on the channel pair to be bridged. This inverts the phase of the input signal to the second channel. These two channels are now operating together in Bridged Mono mode, and the output must be taken from the two (+) terminals of the corresponding bridged channel pair 7.8 Loudspeaker Output Connectors Three terminal blocks (two on the 4200A) provide connections for the speaker outputs. In BRIDGE mode, the channel 1, 3, or 5 (+) connection is the Bridged (+) speaker output terminal, and the channel 2, 4, or 6 (+) connection is the Bridged (-) speaker output. CAUTION! NEVER CONNECT THE TWO BRIDGED OUTPUTS TOGETHER OR CONNECT EITHER BRIDGED OUTPUT TO GROUND. Model 6125A shown. Model 4200A has only four channels. 9 Operating Manual 6125A and 4200A Multi-Channel Power Amplifier 7.9 AC Inlet The 6125A and 4200A amplifiers can be configured by the customer for operation at either 115VAC or 230VAC mains. Switching from one to the other simply requires the following steps: 1.) Unplug the amplifier from the wall and remove the power cord from the rear of the amplifier. 2.) Using a small screwdriver as a lever, unlatch the fuse holder in the AC inlet and remove it. 3.) Remove the voltage selection insert and rotate until the new nominal mains voltage level indication (115 or 230) is on top and properly oriented for reading. 4.) Replace the voltage selection insert in the AC inlet, making sure that it is plugged in all the way. 5.) Replace the fuse with the appropriate size (see #6 below), and press the fuseholder back into the AC inlet until it latches. 6.) Using a power cord of the appropriate size and with the appropriate terminations, plug the cord into the rear of the amplifier and then into the wall. The amplifier is now ready for use at the new mains voltage. If the mains voltage is 110-125VAC, the required fuse is MDA 12, 250V, and the required power cord is 3- wire grounded, 13 Amp (16AWG) minimum. If the mains voltage is 220-250VAC, the required fuse is MDA 10, 250V, and the required power cord is 3- wire grounded, 10 Amp (18AWG) minimum. 8. SELF-PROTECTION FEATURES The 6125A and 4200A amplifiers contain circuitry to self-protect during extreme fault conditions. These fault conditions are: 1.) Power supply undervoltage 2.) Power supply overvoltage 3.) Output overcurrent 4.) Heat sink overtemperature 5.) Unacceptable DC or high frequency output content 6.) AC power interruption Except for AC power interruption, the detection of ...
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