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OSP has been around for about 5 years now and is owned and operated by experienced musicians and audio professionals. OSP products are quickly becoming the pro's choice for gear such as: rack mount road tour flight cases, earset microphones, pro audio snakes, and stage audio floor boxes.

Wireless microphones are radio systems that replace the wire (or cable) used to connect a microphone to a sound system. A microphone cable is a simple device that is very reliable, low in cost, but restricts movement and can not be concealed by an actor.

Wireless microphones should only be used when a wired microphone is impractical. All wireless mics have two parts, a transmitter and a receiver. The transmitter is either an all in one handheld microphone with the radio transmitter in the handle or a belt-pack transmitter to which a lapel or head-worn microphone can be attached. The receiver represents the other end of the link and turns the radio waves back into an electrical signal and is plugged in to the same place a standard mic cable would go.

All transmitters use a battery to provide power and can be operated up to 8 hours before replacement is required. We recommend an alkaline battery which should be discarded after each use.

Both AC and battery powered receivers are available. The battery powered models are for use in the field or on camcorders, use the AC powered models whenever possible, they cost less and work better. Better receivers have a feature called diversity reception in which two antennas are used to reduce signal drop-outs.

Most wireless mics use FM modulation and all must be on a frequency not used for other purposes. When more than one wireless systems is being used, each system must be on a different frequency. Two transmitters on the same frequency can not be used on one receiver. Some wireless systems are tunable (frequency can be changed) some are fixed frequency.

Tunable wireless systems need little planning when ordering since they can be tuned by the user. When ordering a fixed frequency system please have a frequency list of any other wireless mics or 2-way radios used in the vicinity, also a list of what channels local TV stations are on. We will be glad to help find compatible frequencies.

The reliable range of most systems is 50 to 100 feet. The enemy of quiet and reliable reception is interference from other radio systems and the distance between the transmitter a receiver. The closer they are, the stronger the signal is at the receiver; a stronger signal is a good thing.

The cost of wireless systems reflects the quality of the sound, immunity from interference, tunability and reliability. Wireless systems can never equal the sound of a simple microphone cable, but the higher the cost, the closer it gets.

We have several customers that ask this question so we thought we'd write a post about it. You may be wondering if you bought another handheld mic wireless mic transmitter to add on to your existing wireless system could you use both at the same time? The answer is unfortunately no, you need two systems to use two mics in a wireless system because the microphone is the transmitter. A wireless system is a small scale version of a typical commercial FM broadcasting system. You have a transmitter and a receiver. The transmitter and receiver are tuned to a specific frequency. The receiver must be tuned to that frequency to hear that transmitter. Remember the mic is the transmitter. So if you want to use two transmitters (mics) to one receiver you must totally power down the mic you are not using. Otherwise there will be interference between the two mics. The same as when you are in your car between two radio stations on the same frequency. The stronger signal will overpower the weaker signal. And until you are totally out of range of one or the other they will interfere with each other. The receiver will struggle and fight to lock on to one of the two transmitters and you will hear some really weird squealing and screeching noises. There are some Dual wireless systems that are sold with two transmitters and one receiver box that acutally has two separate receivers built into one box. They have two outputs and require two separate channels on your mixer.