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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...


Why should I use an omnidirectional microphone?

Six Reasons to Use an Omnidirectional Mic instead of a Unidirectional Pity the poor, misunderstood omnidirectional microphone. Though it has many redeeming characteristics, it now plays second violin to the unidirectional mi...


Removing earphone sleeves

Shure earphones are packaged with sleeves on the stems. During periods of storage and shipping, the sleeves can adhere to the stems. Given the choice between a sleeve that is difficult to remove and a sleeve that easily comes off...


How far away will my microphone pick up?

The Myth of Microphone Reach Shure is often asked "How far away will my microphone pick up?'" or "Which microphone has the best reach?" Both questions are based on a misunderstanding of how microphones...


What is Phantom Power?

Phantom power is used with condenser microphones. It is called phantom power because there is no obvious external power supply for the condenser mic; the power supply is invisible and therefore a "phantom." The mixer sends volta...


Stylus Wear and Record Wear

In 1954, a booklet was published on this subject.  It has been out of print for decades.  Shure Applications Engineering found a copy and is making it available in this FAQ. The original text has been edited and condens...


Differences between Beta 87A, Beta 87C, and SM87A

For the differences between SM and Beta microphones, click on the following links: Beta models vs. SM models SM87A vs Beta 87A Benefits of the Beta 87C over the 87A?


How to insert and wear Shure SE earphones

These photos demonstrate the recommended way to wear the SE earphones. First, bend the cable near the earphone into a shape that will work as a "hook" to go around the top of the ear. It is best to make sure that b...


SE Earphone Cable Removal

The cable/earphone connector is difficult to remove, and designed like this on purpose. Grasp the earphone using a piece of cloth, like the T-shirt, between your fingers and the earphones.   Do the same with y...


Difference between a SM57 and a SM57-LC ?

The SM57 "microphone" used to come in two different "packages". One was the SM57-CN which included a standard, 7 meter, XLR to XLR mic cable. The other one was the SM57-LC which came without a cable - just the mic and stand adapt...


Can I parallel microphones into one input of my mixer?

Wiring Microphones in Parallel Connecting microphones in parallel allows more than one microphone to be connected to the same microphone input of a mixer. This reduces the cost and complexity of the sound system, since fe...


Pin-out for Shure bodypack transmitters and preamps - TA4M / TA4F

Product Model Wiring Wireless bodypack transmitters - all models with TA4M connectors MX1BP Battery/Phantom Preamplifier RK183PK Microflex Prea...


Technical differences between ULXD, QLXD, PGXD, and GLXD

Frequency Band PGX-D: 902-928 MHz* GLX-D: 2.4 GHz QLX-D: 176-216, 470-928 MHz* ULX-D: 176-216, 470-928 MHz* *Country Dependent Maximum Simultaneous Systems Under Optimal Conditions PGX-D: 5 GLX-D: 4 GLX-D Adv...


Difference between a Line input and a Mic input?

Here are brief answers: 1) The voltage level of the signal. A line level signal is at least 50 dB greater than a mic level signal. 2) Wired and wireless mics are typically connected to mic level inputs. Most other audio...


Counterfeit (fake) Shure products

It is true. There are Shure counterfeit products being sold on the Internet and in stores. Any company that has a brand known around the world is subject to counterfeit goods; examples include Sony, Rolex, Hermes, Coach, Levi'...


Reglas Básicas para Configurar un Sistema de Monitoreo Personal

Click here for English   Gracias a recientes avances en el campo del Monitoreo Personal, esta tecnología ha logrado estar al alcance de más artistas que nunca. A pesar de los numerosos beneficios de uti...


Which microphone should I use on ... ? (Selection Guides)

The following are current Shure microphones as of March 2018. Vocals Live Vocals KSM8 KSM9 Beta 58A SM58 Beta 87A ...


Phono cartridge alignment gauge - how to use and how to make your own

The gauge aligns the cartridge/stylus so that the stylus tip contacts the walls of the record groove at the proper angle.  Attached below is a PDF file of the gauge.  It can be printed and glued to thin cardboard if you...


Help me find the frequency band on my wireless mic

The band information is printed on every transmitter and receiver.  Depending on the model number, the band information could be on the front, the back, the bottom, or inside the battery compartment. The band will be similar...


Coordinate existing wireless using Wireless Workbench 6 tutorial

The Wireless Workbench 6 (WWB) software can be used to coordinate frequencies for your systems. Wireless Workbench 6 can be downloaded for free and works on both Windows and Mac. This tutorial will explain how to perform fre...


SM58LC and SM58 CN - differences

LC = less cable...no cable is provided CN = connector...a cable is provided with XLR connectors at both ends


Wireless Troubleshooting Hints

Troubleshooting Wireless Microphone Systems   Even when wireless microphone systems appear to be properly selected and set up, problems may arise in actual use. While it is not practical here to offer comprehensive s...


Analog wireless microphones vs. digital wireless

Shure's Dave Mendez provided the following observations: It is difficult to say whether analog wireless or digital wireless systems are better or worse than one another as a rule.  In general, digital wire...


How do I fix my feedback problem?

Feedback: Fact and Fiction One of the most commonly asked questions in professional audio is “What microphone can I use that doesn’t cause feedback?” The answer to the question is, of course, that no such mi...


SM7B Output Level and Preamp Gain Specifications

The SM7 (SM7A, SM7B) is a dynamic microphone. A typical dynamic mic has a lower output level than a typical condenser mic. For example, the dynamic SM7 has an output level that is 28 dB (!) less than the condenser KSM44 [cardioid...


Scan function - Recommended Method

Note 1: If there are existing, older wireless systems that will still be used, make certain they are powered up, operating, and placed on stage before beginning the scanning function. Refer to the User Guide of each Shure system...


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