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What is the difference between UHF and VHF frequencies?

Frequency Bands for Wireless Microphone Systems Every wireless microphone system transmits and receives on a specific radio frequency, called the operating frequency. Allocation and regulation of radio frequencies is supervis...


Understanding Earphone / Headphone Specifications

Understanding Earphone/Headphone Specifications Though one of the most common items in the audio chain, earphones or headphones may not always work properly. Common problems are distorted audio, low level with the volume at m...


Earphones in the Washing Machine

The odds are in your favor.  Shure earphones often survive a trip through a washing machine.  Here are the steps to take after discovering the newly washed earphones: Dry the earphones thoroughly with a soft tow...


Mic Level and Line Level -- What do they mean?

Some mixers have switches on the rear panel for setting each input jack or output jack for mic level or line level. These terms refer to the signal level or intensity. Microphone level is in the region of  -60 dBV&...


Difference between a dynamic and condenser microphone

Dynamic and condenser describe the operating principal used in a microphone. Operating principle - The type of transducer inside the microphone, that is, how the microphone picks up sound and converts it into an electrical s...


Troubleshoot wireless mic dropouts

Dropouts in wireless mics can be caused by many things, including antenna placement, bad antenna cable, antenna distribution problems, frequency selection, interference, etc. Troubleshooting dropouts will be a process of tri...


What is "Squelch" on a wireless receiver?

Blog Posting about Squelch An circuit that is important to proper receiver behavior is called "squelch" or muting. The function of this circuit is to mute or silence the audio output of the receiver in the absence of the des...


Five Mistakes to Avoid When Using Wireless

While wireless systems have freed performers from the bonds of cords and cables, they've unleashed a number of headaches for the sound crew. Getting a wireless system to behave predictably is a challenge faced by touring prof...


Locking and Unlocking transmitters and receivers

BLX SERIES Transmitter (Power & Frequency) Lock or Unlock: With transmitter ON, hold down the GROUP button, then press the CHANNEL button for two seconds. Receiver (Power & Frequency) Lock or Unlock: Power ON the re...


Hum in a Hi-Fi System or Turntable

SOURCES OF HUM It is difficult to answer the question "What makes my hi-fi system hum?" because there are many possible causes. However, the cures are simple and will eliminate hum in many cases when the outline ...


Can I use two (or more) wireless microphones with one receiver?

No, this will not work. A wireless receiver can only demodulate the signal from one active mic-transmitter at a time. But you may use one transmitter or the other, as long as only one transmitter is powered up at any time. ...


Color code for phono cartridge wiring

The color code below applies to the majority of turntables and tone arms: Left = white wire Left Ground = blue wire Right = red wire Right Ground = green wire Be certain to check your turntable user guide to confirm ...


Diminished sound in one ear of my earphones

Most likely it is due to earwax inside the nozzle or sleeve. The nozzle is the passage way for the audio signal.  The nozzle opening is very tiny.  The smallest amount of wax or moisture can cause a drastic drop in...


Reserved TV channels and registering wireless mics

Background After the 700 MHz auction in 2009, many unoccupied TV channels are shared between wireless microphones and white space devices (WSD's). A WSD can only transmit on TV channels that are unassigned to a TV station ...


1/4" TRS Stereo vs. 1/4" TRS Balanced

1.If you have a stereo TRS 1/4" cable.. is that the same as the balanced TRS 1/4" cable * Yes. but left is on one and right is on another? * Typically tip is left and ring is right, HOWEVER, this is an unbalanc...


Batteries and wireless microphones

Batteries and Wireless Microphones Benjamin Franklin first coined the term "battery" during his famous electrical experiments. Then around 1800, Alessandro Volta, a professor of natural philosophy at the University ...


Transformers - When to use and how does it work?

Audio Transformers Audio transformers can: 1) Step up (increase) or step down (decrease) a signal voltage; 2) Increase or decrease the impedance of a circuit; 3) Convert a circuit from unbalanced to balanced and vice versa; 4...


How do I wire an XLR to 1/4" adapter cable?

There are many different configurations that can be made between an XLR to 1/4" adapter. The XLR connector is pretty straight forward. It has 3 wire terminals and is standard. The 1/4" connector, on the other hand, can ...


SM57 vs SM58

The SM57 and SM58 microphones are based on the same cartridge design. The main difference is in the grille design. The SM58 was designed for vocal application and it uses a ball grille that acts as an effective pop filter. The SM...


Vintage Shure Catalogs (1933-1985)

Year Type Size Model numbers 1933 Catalog 4.0MB 5N, 11N, 22N, 33N, 42, 99 1935 Catalog 5.7MB 41H, 43D, 43E, 43F, 7...


How should I clean my microphone?

Cleaning Microphones You've finally invested in a high quality vocal microphone and your voice has never sounded better. Unfortunately, the keyboard player in your band decides he wants to use your mic during his feature...


Noise problems caused by audio cable

Audio system performance will be degraded due to any undesirable and interfering voltage (developed within or external to the audio system) which evidences itself as "electrical noise". By using the proper cable type wi...


What does the term "dB" mean? How do you calculate it?

THE DECIBEL What is a dB? The decibel (dB) is an expression often used in electrical and acoustic measurements. The decibel is a number that represents a ratio of two values of a quantity such as voltage. It is actually a...


Seven Common Reasons for Wireless Mic Problems

Reason #1: Dead or weak batteries How to check: Substitute newly purchased, brand name alkaline batteries. Examine the wireless mic battery terminals to make certain they are making a secure contact to the terminals on the batt...


Human Hearing Range in Decibels

The human hearing mechanism is highly sensitive and covers a wide range of "loudness."  From the average "threshold of hearing" to the "threshold of pain."  This range is often described as...


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