What is Electrical Power?

What is electrical power? What is the formula for electrical power? What is watts, volts and amps? This article introduces and illustrates these electrical...

Amplifier, Speaker & SPL Calculator

To calculate the theoretical power requirement for an amplifier you need to know 4 values:1) The distance from the speaker. This is normally the...

How Multiple Speakers Share Power

Often people are wanting to add speakers to their amplifier to increase power. However, in most cases, adding speakers will reduce the power in...

Understanding Microphone Sensitivity

What do you understand about microphone sensitivity? Of late I have seen a number of people miss-interpret the specifications of microphones, especially when it...

Understanding Decibels (part 2)

In the first article we saw that a decibel is not a fixed unit, rather, it is a ratio between two levels.  A decibel...

Speaker Impedance Changes Amplifier Power

Speaker impedance changes amplifier power output. In fact, your amplifier power could be nearly half or double its capacity - depending on the impedance...

How do I connect a PVR to a flat screen TV

PVR is an acronym for Personal Video Recorder. A PVR is the new video cassette recorder (VCR). It works similarly to a VCR, but...

Video Signals & Cables: Composite Video

In this article, we look at composite video signal: what it is, what cables to use, where composite video is used and the problems...

How do I choose which Flat Screen TV to buy

Asking which flat screen TV to buy is similar to asking which car to buy. There are many choices, but at the end of...

The Cost of Standby Power

In the popular press there have been a number of reports along the lines of "households wasting hundred of dollars on standby power". Being...