Enping Ding Li Acoustics Technological VHF-4808 Wireless Microphone User Manual VHF 4808

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Document ID	1066849
Application ID	kNXH8+6eDrIzh/+aVQbcgA==
Document Description	Users Manual II
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	278.92kB (3486488 bits)
Date Submitted	2009-02-11 00:00:00
Date Available	2009-02-11 00:00:00
Creation Date	2009-02-11 13:20:50
Producing Software	Corel PDF Engine Version 9.397
Document Lastmod	2009-02-11 13:21:03
Document Title	VHF-4808˵Ã÷Êé.cdr
Document Creator	CorelDRAW Version 9.397
Document Author:	΢ÈíÓû§

Listening For A Lifetime
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 5
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:
0 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 Group recommend you
avoid prolonged exposure to excessive noise. This list of sound levels is included for your
protection.
Some common decibel ranges:
Level Example
30 Quiet library, Soft whispers
40 Living room, Refrigerator, Bedroom away from traffic
50 Light traffic, Normal Conversation
60 Air Conditioner at 20 ft., Sewing machine
70 Vacuum cleaner, Hair dryer, Noisy Restaurant
80 Average city traffic, Garbage disposals, Alarm clock at 2 ft.
The following noises can be dangerous under constant exposure:
Level Example
90 Subway, Motorcycle, Truck traffic, Lawn Mower
100 Garbage truck, Chainsaw, Pneumatics drill
120 Rock band concert in front of speakers
140 Gunshot blast, Jet plane
180 Rocket launching pad
»lnforrnation courtesy of the Deafness Research Foundation
VHF-4808
Professional 4 Channel Wireless System
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Table of Contents
Cautions and Warnings ...............................................
Welcome ............................................................
Listening for a Lifetime ...............................................
Features ................................................
Microphone Basics. .. .
Microphone Placement and Tone Quality ........
VHF-4808 & Stage Monitor/RA. Loudspeakers . .
Receiver Descriptions and Controls ........
Microphone Descriptions and Controls ..
Getting Connected .......................
Maintenance Procedures . . . .
Operations ................................................
Tips for Achieving Optimum Performance . . .
Troubleshooting ......................................................
Specifications ....................................................
Features
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11
..................... 12-13
14
15
Dual Antenna Receiver Design
Squelch Circuitry Eliminates Background and RF Noise Bursts
VHF Band (230.1 MHz— 287.1 MHz) Quartz Lock for Drift- free Operation
Audio-Mute Circuitry Provides Noiseless 0nl0ff Switching
Individual Front Panel Volume Controls
Outputs: 1/4" Unbalanced (2), XLR-TRS Balanced (1)
Excellent Operating Range to 150 Ft.
Low-Battery Indicators
Individual Front Panel RF Indicator LED’s
INCLUDES:
RF Receiver (1)
Handheld Microphones (3)
Headset Transmitter (1)
Headset Microphone (1)
9V Battery (1)
AA 1.5V Batteries (6)
RF Antennas (2)
Mounting Brackets (2)
Bracket Screws (6)
1/4" to 1/4" Cables (2)
AC Power Cable (1)
Metal Carrying Case (1)
Microphone Basics
Microphone Position
The VHF—4808 is ideal for close-up and stage 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 tastefthere is no one "correct" microphone posnion.
Proximity Effect
When the sound source is less than 1/4’ from the microphone, the microphone boosts bass frequencies (by G
to 10 dB at 100 Hz), creating a warmer and richer bass sound than when farther away This effect, known as
the proxmiity effect, happens only in unidirectional dynamic microphones like the VHF-4808.
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 the 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 the talker to 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 ME.
- Reduce the number of open microphones.
- Move the loudspeaker farther away from the microphone.
- 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 a minimal need for “de-
easing"
VHF-4808 & Stage Monitorl P.A. Loudspeakers
If you will be using lheVHF-4808 with stage monitors and/or a PA system. try the following“
- Place the stage monitor directly behind the microphones.
- Locate the PA. loudspeakers so that they point away from the rear of the microphone. (With the
speakers located in these posttlons, the possmility of feedback is greatly reduced).
~ Always check the stage setup before a performance to ensure optimum placement of microphone and
monitors.
meow-mun Every wireless microphone installation is a unique situation, and can present a variety oi problems, Whenever
possible, avoid performing a live performance without first conducting a “walktlirough"tesl a! the system in the performing
area. if major changes (additional wireless systems or intercoms, relocation ofscenery, etc.) have been made since the last
walktnrougn, check the wireless system again, as close to performance time as possible.
Receiver Description and Controls
POWER button: Turns the VH F-4808 ON/OFF.
POWER (LED): Glows BLUE when the receiver is powered ON.
RF (LED): Lights RED when RF signals are received from the microphone channels.
VOLUME controls: Adjusts the individual VOLUME of the receiver's 4 microphone channels.
TELESCOPING ANTENNAS, Provides RF SIGNAL reception.
AUDIO OUT 1 & 2' Two 114" unbalanced and 1 XLR OUTPUT jacks for connection to amplifiers or mixers For
separated HEADSET output, connect both 1/4" jacks to your mixer.
POWER input‘ MAINS POWERjack for connection to a compatible AC outlet.
SQUELCH controls" Manual controls for controlling each microphones signal strength for best performance.
Turn clockWise to increase SQUELCH application. Tum counter-clockwise to decrease SQUELCH application.
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37.“

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