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CRTs
The most prevalent type of monitor today is the cathode ray tube (CRT). Despite its rather sci-fi sounding name, a CRT is the same as the picture tube inside your TV. They work by firing beams of electrons at phosphor dots on the inside of a glass tube. The phosphors in a CRT are chemicals that emit red, green or blue light when hit by electrons. These monitors are capable of multiple resolutions, give the best look to full-motion video and provide better control over colour calibration for graphic artists.
On the down side, they hog a lot of room and weigh more than several sacks of potatoes. You can get more compact CRTs called short-depth or short-neck monitors which are a couple of inches shallower than regular CRTs. Unless space is a primary consideration, most people buy a CRT display because they offer good performance at an affordable price.
LCDs
In the opposing corner are flat panel displays or LCDs (liquid crystal displays) commonly used in laptops and fast becoming popular as desktop monitors. Their major selling points are a slim profile and light weight. A CRT can be deeper than it is wide, whereas a LCD with a base is only about a handspan deep. No heavy lifting required with a LCD; they weigh less than half the average CRT. LCDs require half the power of CRTs and emit much less electromagnetic radiation which can interfere with other electronic devices.
In the screen of a LCD monitor, each pixel is produced by a tiny cell which contains a thin layer of liquid crystals. These rod-shaped molecules bend light in response to an electric current. It''s the same display technology that resides in your digital watch but more sophisticated.
LCDs tend to be clearer than CRTs which can suffer from convergence or focus difficulties. Their improved clarity means that even small LCDs can display higher resolutions than the corresponding sized CRT. They also make small text easier to read. Unlike CRTs, LCD monitors have only one optimal resolu

Computer speaker systems have brought a new element to the computing experience. Though they may be a form of analog technology, they are not yet archaic or outdated. Instead, speakers serve to merge the digital world to the sensory world that we live in. Ultimately, they have served as a catalyst for multimedia computing¿what good would an MP3 or webcast be with just subtitles?
Our society has been bred on television as a medium. Integrated video and audio is a standard set in our childhood that is now fueling a bandwidth hunger via the Internet. As a result, computer speakers are as important as the monitor in our computing environment. The growth of computer audio has also resulted in more choices in size, styling, and format of speaker systems. The challenge is to find a high quality speaker system that will heighten the computer experience through quality and power, instead of an ill chosen system that holds back the entire computer
The Decibel
Before jumping directly into the technical nitty gritty, some explanation of the measurement standards used in audio is necessary. For everyone that knows the difference between dBm and dB SPL, and especially how they relate to the audio industry, feel free to skip directly to the specification breakdown. Audio specifications are not exactly transfer rates or IP addresses, so some background can be helpful.
The key unit in audio is the decibel. Technically one tenth of a Bell (yes, it is named after Alexander Graham Bell, and carries the capitalization when abbreviated), it is a logarithmic scale that compares two power quantities. Logarithmic, besides being a hard word to spell, is a technique used when relatively large quantities, such as 10 and 1000 for example, are compared to each other. A logarithmic scale compare the difference based on the ratio of the second quantity to the first instead of the difference between the two as in a linear scale. Figure 1 demonstrates the logarithmic curve o