Imaging, staging, dynamics, and spectral balance. The reason that this doesnt work well is that the physical properties that make a speaker good at a certain frequency range make it bad in another frequency range. For instance, a subwoofer is good at moving very large volumes of air with its large cone area and heavy mass. But that heavy mass prevents it from moving quickly enough to handle the high frequencies. Additionally, cars introduce alot of noise to the equation, and most of this noise is in the lower frequencies. 48db, then the speaker producing sound in those frequencies has to be 48db louder than the rest of the auido system to compensate for it.

Despite just listening to two speakers, you can hear hear each individual instrument clearly localize in the space that it occupied in the recording environment.

You will be able to tell that the woodwinds were to the left and behind the strings, if the venue was large or small, all in a very 3D effect. Its because the recording not only picked up the sound that was being played, it also recorded the temporal and spatial cues of the environment. This is called imaging, and in a car audio system it comes from quality speakers, where theyre positioned, and how they are angled into the listening environment. Like imaging, good staging comes from quality speakers, where theyre positioned, and how they are angled into the listening environment. Dynamics:::: Refers to the systems ability to play loud and soft music.

Adding power amplifiers will allow the system to play more dynamically. The best way to make this decision is to listen to some well recorded music on a your system, then listen to the same music on a quality system. With some music, the bass is obviously more pronounced than others, but not necessarily as you would think.

Most people wouldnt know that unless they listened to it on a quality sound system with a good subwoofer. Most pop music and rap these days are not good quality recordings. And unless you listen to satellite radio, the source material isnt good enough to make a large investment into your sound system worthwhile. There are several ways to see through clothes. Notkalie already told you the answer to your question.

Terahertz radiation can penetrate fabrics and plastics, so it can be used in surveillance, such as security screening, to uncover concealed weapons on a person, remotely. This is of particular interest because many materials of interest, such as plastic explosives, have unique spectral "fingerprints" in the terahertz range. This offers the possibility to combine spectral identification with imaging. Passive detection of Terahertz signatures avoid the bodily privacy concerns of other detection by being targeted to a very specific range of materials d objects. In the case of airline passenger screening it is her nude form. As technology develops, Im sure the list will expand. Data collection from distant galaxies is mainly by studying the light we recieve from them.