3 Setup
SENSITIVITY SWITCH INSIDE ACCESS HOLE
1.4 V |
26 dB |
0.77 V |
THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE COVER PLATE (ABOVE) TO ACCESS SENSITIVITY SWITCH.
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BALANCED | 2 |
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| INPUT GROUND LIFT |
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| 10 | UNBALANCED | |
INPUT WIRING | 1 |
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+ TIP | 0 |
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| INPUT | LIFT | INPUT | 0 |
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– RING | GAIN |
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| (AFFECTS PHONE | INPUTS ONLY.) | (MONO) |
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GND SLEEVE |
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GROUND LIFT SWITCH
Figure 3.7 Input Sensitiviy and Ground Lift Switches
3.7 Set Input Sensitivity
The
To change the input sensitivity:
1.Remove the back panel cover plate (or input connector accessory).
2.Locate the access hole for the sensitivity switch inside the chassis opening (Figure 3.7). The sensitivity switch will not be vis- ible because it is mounted below the hole. Use your little finger to reach it.
3.Set the switch to the desired position noted on the label beside the access hole.
4.Replace the back panel cover plate (or input connector accessory).
3.8Set Ground Lift Switch
The ground lift switch (Figure 3.7) is located on the back panel and can isolate the input sig- nal grounds from the AC (chassis) ground. It affects only the phone jack inputs and has no effect on accessory input connectors. Sliding the switch to the left isolates or “lifts” the grounds by placing an impedance between the sleeve of each phone jack and the AC ground.
The
3.9 Connect to AC Mains
Connect your amplifier to the AC mains power source (power outlet) with the supplied AC power cordset.
WARNING: The third prong of the power connector (ground) is an important safety feature. Do not attempt to disable this ground connection by using an adapter or other methods.
Amplifiers don't create energy. The AC mains voltage and current must be sufficient to deliver the power you expect. You must operate your amplifier from an AC mains power source with not more than 10% variation above or below the amplifier's specified line voltage and within the specfied frequency requirements (indicated on the amplifier's back panel label). If you are unsure of the output voltage of your AC mains, please consult your electrician.
3.10 Startup Procedure
Use the following procedure when first turning on your amplifier:
1.Turn down the level of your audio source.
2.Turn down the level controls of the ampli- fier.
3.Turn on the “Power” switch. The Power indicator should glow.
4.Turn up the level of your audio source to an optimum level.
5.Turn up the Level controls on the amplifier until the desired loudness or power level is achieved.
6.Turn down the level of your audio source to its normal range.
If you ever need to make any wiring or installa- tion changes, don't forget to disconnect the power cord.
For help with determining your system's opti- mum gain structure (signal levels) please refer to the Crown Amplifier Application Guide, available online at www.crownaudio.com.
Operation Manual | page 9 |