VocoPro Headphones UHF 3800 User Manual

 
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Welcome!  
Thank you for purchasing the UHF-3800 from VocoPro, your ultimate choice in  
Karaoke entertainment! With years of experience in the music entertainment business,  
VocoPro is a leading manufacturer of Karaoke equipment, and has been providing  
patrons of bars, churches, schools, clubs and individual consumers the opportunity to  
sound like a star with full-scale club models, in-home systems and mobile units. All our  
products offer solid performance and sound reliability, and to further strengthen our  
commitment to customer satisfaction, we have customer service and technical support  
professionals ready to assist you with your needs. We have provided some contact  
information for you below.  
VocoPro  
1728 Curtiss Court  
La Verne, CA 91750  
Toll Free: 800-678-5348  
TEL: 909-593-8893  
FAX: 909-593-8890  
VocoPro Company Email Directory  
Customer Service & General Information  
Tech Support  
Remember Our Website  
products, packages and promo's. And while you're there don't fo rget to check out our  
Club VocoPro for Karaoke news and events, chat rooms, club directories and even a  
Service directory!  
We look forward to hearing you sound like a PRO, with VocoPro, your ultimate choice in  
Karaoke entertainment.  
FOR YOUR RECORDS  
Please record the model number and serial number below, for easy reference, in case of loss or theft. These numbers  
are located on the rear panel of the unit. Space is also provided for other relevant information  
Model Number  
Serial Number  
Date of Purchase  
Place of Purchase  
2
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Listeningfor aLifetime
Selecting fine audio equipment such as the unit you've just purchased is only the  
start of your musical enjoyment. Now it's time to consider how you can maximize the  
fun and excitement your equipment offers. VocoPro and the Electronic Industries  
Association's Consumer Electronics Group want you to get the most out of your  
equipment by playing it at a safe level. One that lets the sound come through loud  
and clear without annoying blaring or distortion and, most importantly, without  
affecting your sensitive hearing.  
Sound can be deceiving. Over time your hearing "comfort level" adapts to a higher  
volume of sound. So what sounds "normal" can actually be loud and harmful to your  
hearing. Guard against this by setting your equipment at a safe level BEFORE your  
hearing adapts.  
To establish a safe level:  
Start your volume control at a low setting.  
Slowly increase the sound until you can hear it comfortably and clearly, and without  
distortion.  
Once you have established a comfortable sound level:  
Set the dial and leave it there.  
Pay attention to the different levels in various recordings.  
Taking a minute to do this now will help to prevent hearing damage or loss in the  
future. After all, we want you listening for a lifetime.  
Used wisely, your new sound equipment will provide a lifetime of fun and enjoyment.  
Since hearing damage from loud noise is often undetectable until it is too late, this  
manufacturer and the Electronic Industries Association's Consumer Electronics  
Some common decibel ranges:  
Level  
Example  
30  
40  
50  
60  
70  
80  
Quiet library, Soft whispers  
Living room, Refrigerator, Bedroom away from traffic  
Light traffic, Normal Conversation  
Air Conditioner at 20 ft., Sewing machine  
Vacuum cleaner, Hair dryer, Noisy Restaurant  
Average city traffic, Garbage disposals, Alarm clock at 2 ft.  
The following noises can be dangerous under constant exposure:  
Level  
Example  
90  
100  
120  
140  
180  
Subway, Motorcycle, Truck traffic, Lawn Mower  
Garbage truck, Chainsaw, Pneumatics drill  
Rock band concert in front of speakers  
Gunshot blast, Jet plane  
Rocket launching pad  
-Information courtesy of the Deafness Research Foundation  
4
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Microphone Basics  
Microphone Position  
The UHF-3800 is ideal for close-up vocals and can be held in the hand or mounted on a mic stand.The  
most common applications and placement techniques are listed below. Keep in mind that microphone  
technique is largely a matter of personal taste, there is no one "correct" microphone position.  
Proximity Effect  
When the sound source is less than 1/4 in. from the microphone, the microphone boosts bass  
frequencies (by 6 to 10 dB at 100 Hz), creating a warmer and richer bass sound than when farther  
away. This effect, known as proximity effect, happens only in unidirectional dynamic microphones  
like the UHF-3800.  
Feedback  
Feedback occurs when the amplified sound from any loudspeaker reenters the sound system through  
any open microphone and is amplified again and again and again. Most commonly, feedback is caused  
by the following conditions: placing loudspeakers too close to microphones, having too many open  
active microphones, boosting tone controls indiscriminately (mainly treble) and performing in areas  
with high ratios of room surfaces that have hard and reflective surfaces such as glass, marble and  
wood. What to do if feedback occurs before the sound system is loud enough?  
Request that the talker speak louder into the microphone.  
Reduce the distance from the talker to the microphone. Each time this distance is halved, the sound  
system output will increase by 6dB.  
Reduce the number of open microphones.  
Move the loudspeaker farther away from the microphone. Each time this distance is doubled, the  
sound system output can be increased by 6dB.  
Move the loudspeaker closer to the listener.  
Use an equalizer/feedback reducer to cut the frequency bands in which the feedback occurs.  
Microphone Placement & Tone Quality  
Lead & Backup Vocals  
Lips should be less than 3" from or even touching the windscreen on an axis to the microphone.  
Doing this creates a robust sound, emphasizes bass and provides maximum isolation from  
other sources.  
Speech  
When giving a speech or simply speaking, place the microphone 4" to 10" away from the mouth, just  
above nose height for a natural sound with reduced bass. You can also place the microphone  
8" to 16" away from the mouth, slightly off to one side, for a more "distant" sound with highly  
reduced bass and minimal "s" sounds.  
5
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Front and Rear Panel Descriptions  
1. POWER button - Turns the UHF-3800 ON/OFF.  
2. POWER LED indicator - Glows BLUE when the receiver is powered ON.  
3. RF/AF LED indicator - Lights RED when RF signals are received from the  
microphone channels and output to external devices.  
4. VOLUME controls - These controls adjust the VOLUME level for each MIC channel.  
5. RF ANTENNAS - Provides RF SIGNAL reception to the RECEIVER.  
6. 1/4" AUDIO OUT (MIXED A-B) - This ¼" unbalanced OUTPUT jack is for output  
connection to amplifiers, effects devices or mixers. Both Mic channels are output  
through this jack for mixed output.  
7. XLR AUDIO OUT (SEPARATE A-B) - These XLR balanced OUTPUT jacks are for  
output connections to amplifiers, effects devices and/or mixers. These are for  
separate mic channel connections with unmixed mic output.  
8. CHANNEL SELECTOR - This selects one of the four dual-channel frequency pre-sets. The receiver  
and mics must all be set to the same pre-set. For example, if this is set to "1", both mics must  
also have their channels set to "1" to work.  
9. FUSE terminal - This terminal houses the system fuse. Only replace with same  
type/rating of fuse.  
10. VOLTAGE selector - Selects between 110-120V and 220-240V power settings.  
11. AC POWER terminal - MAINS POWER jack for connection to a compatible  
AC outlet.  
Front and Rear Panel  
4
5
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2
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8-Channel Dual UHF Wireless Microphone System  
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7
6
8
9
1 0  
1 1  
BALANCED OUTPUT  
CAUTION  
L A V E R N E C A L IF O R N IA  
U . S .  
RISK OF EECTRICAL SHOCK  
DO OT OPEN  
!
A
AUDIO OUTPUT  
UNBALANCED  
8-Channel Dual UHF Wireless Microphone System  
AC: 110V/240V  
50/60Hz  
C
AU  
T
IO NTO:RDUCE THE RISK OF  
FIRE. REPLACE ONLY WITH THE SAME TYPE  
AND RATING OF FUSE  
IOUTNI:SER UN FUSIBLE DE  
RECHANGE DE MEMETYPE  
VOLTAGE SELECTOR  
AC110V AC240V  
SERIAL NO:  
FREQUENCY  
AT  
E
N
T
1.5A  
564.2-575.9Mhz  
545.2-554.6Mhz  
B:  
A:  
CHANNEL 1234  
DC 12V 2A FUSE  
AC INPUT  
MIXED A/B  
MIC-B  
MIC-A  
8
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Mounting  
To install the UHF-3800 to a 19" rack case, complete the steps below.  
1. Attach mounting brackets to the UHF-3800 via the supplied mounting screws.  
2. Align the UHF-3800 with desired space in rack and slide in slowly, rear panel first.  
NOTE: Depending on your rack case design, it may be necessary  
to allow for sufficient space for the antennas.  
.
3. While aligned, use rack case screws (not included) in the order shown below to stabilize the  
UHF-3800 in its space, using the "X" rotation (numbered below) will ensure even tension  
and plush alignment.  
NOTE: Do not tighten screws firmly until all screws are in place.  
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AUDIO OUTPUT  
UNBALANCED  
8-Channel Dual UHF Wireless Microphone System  
SERIAL NO:  
AC: 110V/240V  
VOLTAGE SELECTOR  
TO REDUCE THE RISK OF  
FIRE. REPLACE ONLY WITH THE SAME  
TYPE AND RATING OF FUSE  
UTILISER UN FUSIBLE DE  
RECHANGE DE MEMETYPE  
AC110V  
AC240V  
50/60Hz  
1.5A  
FREQUENCY  
A: 564.2-575.9Mhz B: 545.2-554.6Mhz  
CHANNEL 1234  
DC 12V 2A FUSE  
AC INPUT  
MIXED A/B  
MIC-B  
MIC-A  
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Troubleshooting  
Problems  
Solutions  
No sound output, RF/AF  
LED(s) not glowing.  
Make sure the microphone and receiver power switches and  
receiver are set to the ON position.  
Check microphone batteries to ensure that they are providing  
sufficient power. Replace battery if necessary.  
Check receiver's AC power connection.  
Make sure antennas are firmly connected and extended to an  
optimal position.  
If necessary, reduce the distance between the microphones  
and receiver.  
Turn up the receiver's VOLUME level controls.  
Check for proper connection between receiver and external  
amplifier/mixer.  
Talk into the microphone and observe the receiver's RF/AF signal  
LED's. If they glow, the problem is elsewhere in the sound system.  
Received signal is noisy or  
contains extraneous  
sounds with the  
Check microphone(s) batteries and replace if charge is low.  
Remove local sources of UHF interference, such as  
microphone(s) ON.  
lighting equipment.  
Signal may be too weak. If so, reposition antennas. (If possible,  
move them closer to the transmitter).  
Noise coming from the  
receiver with the  
microphones turned OFF.  
Remove local sources of UHF interference, such  
as lighting equipment.  
Reposition the receiver or antennas.  
Momentary loss of sound as  
microphone(s) are moved  
throughout the operating  
range.  
Reposition the receiver, perform a "walkthrough", and observe the  
signal strengths. If audio dropouts persist, mark these "dead  
spots" in the operating area and avoid them  
during the performance.  
15  
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UHF-3800 Owner’s Manual version 2  
© VocoPro 2007  
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