Figure 12: Input Sensitivity Control
1.Turn the Input Sensitivity Control all the way down (counter clockwise).
2.Set the volume control of the source unit to approximately 2⁄3 of its maximum output.
3.Turn the balance control of the source unit to its center position.
4.Leave the tone (bass/treble) controls at their usual position.
5.Play a CD or tape track with wide dynamic range
6.To locate the optimum input sensitivity setting, ask the person assisting you to turn the Input Sensitivity Control clockwise until audio distortion starts to develop. Turn the sensitivity control counter clockwise slightly to minimize the distortion.
7.If you constantly switch between CD/tape and radio, you will need further adjustment since radio output level differs from that of CD or tape. In this case, you need to locate a balanced sensitivity setting which is best for both the output level of radio and that of CD or tape.
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SYMPTOM | PROBABLE CAUSE | |
1. | No power | Check connections to the amplifier's Ground, B+ & Remote termi- |
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| nals. Check connection at "+" terminal of the battery. Check the |
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| remote |
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| source is turned on (or when the switch is turned on). Refer to the |
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| Installation Section. Check the power line fuse: if fuse is blown, |
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| replace it; if fuse continues to blow, check the power wire and |
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| also the amplifier for a short. If the short is in the power wire, fix |
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| it; if the short is in the amplifier itself, see your Coustic dealer. |
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| Check the voltage at the amplifier, and the remote ON/OFF |
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| lead. The voltage should measure between |
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| urement is beyond this range, have the source unit checked out |
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| by an authorized dealer. |
2. | Power without sound with | Turn the amplifier off, and Check all input & output signal cables |
| red power/protection | and connections. Check the speakers for short with a VOM |
| indicator on | (volt meter) or by connecting them to another audio system. After |
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| making sure everything is normal, turn the amplifier on again. |
3. | Power without sound with | The continuous red light of the power indicator signals a high |
| red power indicator on | internal operating temperature, which results in the amplifier |
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| switching off temporarily; when the amplifier cools down to a |
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| safe level, the amp will automatically restart. |
4. | No sound from one side | Check balance control. |
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| Check speaker connections. |
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| Check signal input connection. |
5. | Very low sound from | Check your source unit's fader control. |
| both radio & tape | Check the amplifier's Input Sensitivity Level. |
6. | Frequent automatic | This indicates that the amplifier is operating at a continually |
| amplifier shut down | undesirable high internal temperature. High operating tempera- |
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| ture caused by inadequate ventilation: Refer to the |
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| titled LOCATION for better amplifier location. |
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| High operating temperature caused by an excessively low |
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| impedance load, say below 2 ohms stereo or 4 ohms bridged: |
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| Check for bad speakers and/or electronic crossover, proper pas- |
sive crossover components; if all else fails, try rewiring the entire system.
High operating temperature can be caused by an incorrect input sensitivity level: refer to
7."Motorboating": The amplifier power indicator going off repeatedly when the audio system is on
8.Whining noise when engine is running with noise varying with the accelerator (noise level varies with source unit volume control).
Check the amplifier's connection to the battery. Check battery voltage. If low, recharge or replace battery.
Check all ground connections.
Reroute power cable from battery to source unit directly, bypassing the battery terminal in the fuse box. Check power connections to be sure they are clean. Check ground connections to be sure the ground wire is in direct contact with the bare metal surface of the chassis (with that spot scraped clean of all paint, rust or grease).
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