Assessments - 2, GPA: 4
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STEREO BRIDGE MONO PARALLEL MONO DO NOT USE BLACK TERMINALS TURN CHANNEL 2 CAUTION: TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH. STEREO BRIDGE MONO PARALLEL MONO CH-2 CH-1 CH-2 CH-1 CHANNEL 2 IS NOT USED IN THIS MODE. BINDING POSTS. THIS MODE. PARALLEL-MONO MODE POWER BASE AMPLIFIER Fig. 2.1 Three System Connection Methods Page 8 Power Base Series Power Amplifiers 2 Installation Always remove power from the unit and turn the level controls off (fully counterclockwise) when making or breaking connections. This reduces the chance of blasts that can cause loudspeaker damage. The guidelines below are provided to help you quickly get your amplifier installed and ready to go. Be sure to follow the instructions in Sections 2.1 and 2.2 for the selected mode of operation. Additional information on input sensitivity, load protection and required AC mains is provided in Sections 2.3, 2.4 and 2.5. 1. Install the amplifier in a standard 19 inch (48.3 cm) rack or place it on a stable surface. The mounting dimensions are 19 inches (48.3 cm) wide, 3.5 inches (8.9 cm) tall and 16 inches (40.6 cm) deep behind the mounting surface. IMPORTANT! Allow for adequate ventilation. AIR FLOW AMPLIFIER (TOP VIEW) RACK CABINET 16 in 40.6 cm 2 in MIN. 17 in 43.2 cm AIR FLOW IMPORTANT: Be sure the back of the amplifier is supported. AIR FLOW Fig. 2.2 Do NOT Block Air Flow 2. Use high-quality loudspeaker cables to connect the load to the amplifier’s outputs. Do not use shielded cable. 3. Use shielded cables to connect audio sources to the amplifier inputs. Either balanced or unbalanced wiring can be used as shown below. (XLR connectors are available with the MT-XLR accessory. See Section 5.) – + 3 1 2 GND FROM PREAMPLIFIERINPUT BALANCED + – SHIELD FROM PREAMPLIFIERINPUT UNBALANCED + SHIELD + 3 1 2 SHIELD Fig. 2.3 Power Base Input Wiring 2.1 Stereo 1. Turn down the level controls (fully counterclockwise) and turn off the amplifier. 2. Set the back panel stereo/mono switch to Stereo. 3. If present, remove the Parallel-Mono jumper. 4. Connect the input and output cables as shown in the first example in Figure 2.1. 5. Turn on the amplifier and adjust the level for each channel using the back panel level controls. CAUTION: Never parallel the two outputs by directly tying them together, and never parallel them with the output of another amplifier. 2.2 Mono Your amplifier’s mono modes provide double the power of Stereo mode in a single channel. In Bridge- Mono mode, the outputs are wired in series for twice the output voltage. In Parallel-Mono mode, the outputs are paralleled for twice the current capacity. Bridge-Mono mode is provided for loads with an impedance greater than 4 ohms. Parallel-Mono mode should be used with loads of 4 ohms or less. B R I D G E - M O N O 1. Turn down the level controls (fully counterclockwise) and turn off the amplifier. 2. Set the back panel stereo/mono switch to Bridge-Mono. 3. If present, remove the Parallel-Mono jumper. 4. Connect the input and output cables as shown in the second example in Figure 2.1. Only use the channel 1 input. 5. Make sure the load is balanced (neither side shorted to ground) and do not use the black (–) binding posts. 6. Turn on the amplifier and adjust the level. Only use the channel 1 level control. P A R A L L E L - M O N O 1. Turn down the level controls (fully counterclockwise) and turn off the amplifier. 2. Set the back panel stereo/mono switch to Parallel-Mono. 3. Install a solid, 14-gauge (2 mm2) or heavier jumper wire across the two red (+) binding post outputs. 4. Connect the input and output cables as shown in the third example in Figure 2.1. Only use the channel 1 input. 5. Turn on the amplifier and adjust the level. Only use the channel 1 level control. CAUTION: With Parallel-Mono wiring, do not switch to Stereo or Bridge-Mono mode until the output jumper wire is removed. Page 9 Power Base Series Power Amplifiers 2.3 Input Sensitivity Adjustment The input sensitivity switch inside the amplifier is set to 0.775 volts at the factory. It can be changed to 1.4 volts or a voltage gain of 26 dB as follows: 1. Turn off and unplug the amplifier from the AC source. 2. Remove the access cover on the back panel. 3. Locate the labeled access hole for the sensitivity switch. 4. Set the switch to the desired position. 5. Replace the access cover plate. When set to 26 dB gain, the Power Base-1® requires a 2.0 volt input, the Power Base-2® requires a 2.5 volt input and the Power Base-3™ requires a 3.2 volt input to Example: (A) Find the peak music power of your loudspeaker (such as 75 watts). (B) Find the loudspeaker impedance (8 ohms). (C) Draw a line between points A and B. The line intersects the middle scale at the correct fuse value (1.5 amps). 1.0 1.2 1.4 1.6 20 2 3000 15 2.5 2000 10 1500 3 8 1000 800 6 600 4 5 4 400 5 1.5 300 deliver full output into an 8 ohm load. 3 200 150 6 Example: 2 SENSITIVITY SWITCH INSIDE ACCESS HOLE 100 Impedance = 8 ohms. 7 80 Peak Power = 75 W LOUDSPEAKE...
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