- How many watts do I need?
A common perception is that an audio system with the most watts is the loudest or best. This is not generally the case. Firstly, there are a few ways to measure watts and the results (how they are measured) differs greatly between professional and domestic audio gear. Secondly, looking for the highest wattage is like looking for a car that uses the most petrol. The actual output of the system depends on the efficiency of the speakers and quite simply how well it matches the desired application. A qualified audio installer will ensure that the system being quoted suits the intended application.
- What is a Wireless Microphone Receiver and Transmitter?
There are two main components of a wireless microphone system. The obvious one is the microphone which the performer or presenter uses. This could be a hand-held style, or it could a clip-on tie mic (also known as a lapel mic) or a head-worn mic, which are then connected to a small pack which clips on the belt. The other component in a wireless microphone system is the receiver, which is normally a small box with antennas. This receives the signal from the microphones and plugs into your audio mixer.
- What is phantom power?
Some microphones require something called phantom power. Phantom power is typically provided by the mixer that the microphone is plugged into. With phantom power engaged (normally a switch on the mixer), power (up to 48V) is sent up the microphone cable to power the microphone. The types of microphones that require phantom power are called electret or condenser microphones ... some examples are hanging choir microphones, flat or boundary microphones and shotgun microphones (often used across the front of a stage for musicals). The more common microphones (called dynamic microphones) do not require phantom power. Please refer to the information supplied with your microphone or contact the company who supplied it for more information.
- What is 100 Volt Line?
The term "100 volt line" is used to describe a popular method of installing PA systems which contain either a large quantity of speakers, or speakers spread over some distance. Conventional audio systems (lets call them low impedance systems) only allow you to connect one or a few speakers per amplifier and the cable distance should be kept as short as possible. With 100 volt line systems, each speaker is fitted with a transformer and when matched with a suitable amplifier, the installer can connect many speakers (sometimes hundreds) to the one amplifier. Additionally, the installer can use long cable runs (between buildings if required) without any noticeable losses. Traditionally, low impedance systems (using 8 ohm or 4 ohm speakers) are what would be used for school hall and performing arts type applications whereas 100 volt line is normally used for wall mount, ceiling mount or horn style speakers.
- What is a Dimmer?
A dimmer is a device used to control the brightness level of a lighting fixture. By increasing or decreasing the power to the fixture, it controls intensity of the light’s variance. Typical terminology for the change in this intensity includes "fade", "fade up" or "fade down". The size of the dimmer is dependant upon the size of the lighting design. Small dimmers are usually used for residential purposes and include the popular wall mounted light switch, whereas larger dimmers are needed for larger lighting installations including stadiums, concerts and external architectural lighting. The dimmers required for stage or entertainment purposes are controlled via DMX, which is connected to the lighting desk.
- What is lighting control/DMX?
DMX lighting controllers are also known as Lighting Consoles. Consoles can either have faders and buttons or use a software program that runs on a computer. Any controller from any manufacturer will work with any piece of lighting equipment as long as both the controller and the equipment comply with the DMX512 standard. A lighting controller is generally used in the live operation of lighting fixtures (or intelligent lights) and other DMX equipment. However, most lighting controllers with DMX allow you to program and save intricate routines for automatic playback. Programmable controllers are always required for operating lighting fixtures during live performances, but a simpler controller is sufficient in other applications. In situations where the same routines are used over and over again (typical in theatre and smaller performances), a playback controller can be used. A playback controller or DMX recorder provides an easy, user-friendly way to control lights without the hassle of programming.
- What are Energy Management Solutions?
We all know that our resources are limited and our environment is precious. There are many ways in the education sector to maximise energy conservation and cost savings. Crestron, the world leaders in automation offer a range of solutions to lower your power consumption, saving you money and the environment, without inconveniencing the day to day running of your school or university. Find out more here.
