Parasound JC 3 Jr., Руководство пользователя

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Frequently Asked Questions
Why won’t the JC 3 Jr. turn on when I press the On-Off button?
- Check the setting of the Turn On Options switch. It must be set to Manual for the front panel
On-Off button to function.
Why won’t the JC 3 Jr. turn on with an external DC trigger?
- Check the setting of the Turn On Options switch. It must be set to 12 V for the 12V trigger to
function. Try reversing the polarity of your 12V trigger source.
- Both trigger wire plugs must be mono (as supplied with the JC 3 Jr.)
Why is there no sound from the speakers?
- Check that the AC is live
-Check that AC Power switch on the rear panel is pressed to its on position.
- Check that the On-Off button and Mono button are illuminated.
- Check that input and output cables are secure at both ends.
I can hear a background hum or hiss from the speakers
- Try a lower gain setting. Options are 40 dB, 50 dB and 60 dB).
- Make sure that you have attached your turntable’s ground wire to the ground terminal on the
back panel of the JC 3 Jr.
- Move audio cables and AC cords away from each other.
- Try to route audio cables and AC cords perpendicular to each other.
- Ensure that the JC 3 Jr., line level preamp, power amp and integrated are plugged into the
same wall AC outlet or power strip.
-You might find that you need to attach the JC 3 Jr. Ground terminal to an audio ground on
your line level preamplifier. Contact Parasound Technical Service for specific instructions.
The sound is distorted and too loud
- Try a lower gain setting (the options are 40 dB, 50 dB and 60 dB).
- The most frequent reason for distortion is using an MM cartridge with the JC 3 Jr. Gain switch
set to 50 dB or 60 dB (try 40 dB). The second most frequent reason is using a high-output
MC cartridge with the Gain Switch set to 60 dB (try 50 dB).
- The higher voltage of the XLR balanced outputs could overload the input stage of your line
level preamp or integrated amp. Try using the RCA unbalanced outputs.
The sound is faint
- Try a higher gain setting (the options are 40 dB, 50 dB and 60 dB).
- The most common cause is using an MC cartridge while the JC 3 Jr. Gain switch is set to
40
dB (try 50 dB). The second most frequent reason is using a low-output MC cartridge while
the Gain Switch is set to 50 dB or 40 dB (try 60 dB).
Should I use Balanced XLR or Unbalanced RCA connections?
We generally recommend balanced connections if your line stage preamplifier or integrated
amplifier has balanced XLR inputs. The JC 3 Jr.’s balanced outputs enable you to take full
advantage of the inherent noise-rejection capability. Recording and broadcast studios use
balanced connections exclusively because balanced interconnects have an inherent ability to
reject external sources of noise and hum, even when components are far apart and connected
by long cables. Many high-quality preamplifiers and integrated amplifiers include balanced
input connections with XLR jacks for the same reasons. Many serious listeners prefer the sonic
characteristics of balanced connections because a lower noise floor assures the greatest
dynamic contrasts plus more defined and spacious soundstage.
Note: Balanced XLR connections are 6 dB “hotter” because the balanced circuit carries
twice the voltage. Audio is noticeably louder than with unbalanced connections.