Posted on April 19, 1988 Updated on September 30, 2014

What will you do if i stated I have found a headphone piece that is not only fascinating but informative also? I knew you wouldn’t believe me, so here it is the educational, superb and interesting article

Thanks to the technological improvements we’ve made for the P7 headphones, sound performance is a revelation.Bass is deep and tight, vocals are clearly defined, and there’s a wonderful sense of space, balance and clarity across the whole frequency range.

At the same time, the over-ear design and snugly fitting ear pads ensure P7 envel¬ops you in sound. Because when you’re hearing sound this good, you don’t want anything to interrupt your enjoyment of it.

Drive unit design

Drive units with precise, controlled movement reproduce sound of the highest quality. With most headphones, sound quality is a direct result of the way the drive units are designed, and the diaphragm usually performs the dual role of sound generator and suspension system.With P7 our engineering expertise has allowed us to create a new kind of head¬phone driver, that works more like the drive unit in a hi-fi speaker, with a diaphragm focussed purely on the job it’s supposed to do: generate sound. Which means a drive unit with a more precise, controlled movement – and a giant leap forward in sound quality.

Dual cavity ear pads

Dual cavity ear pads ensure great sound for all ear shapes and sizes.

P7’s ear pads feature a dual cavity cushion design. This maintains a consistent volume of air between the drive unit and the sur¬face of the ear at both sides of the head. Coupled with ear-pads that mould to the contours of the wearer’s head, the result is enhanced stereo imaging and optimised sound for every listener.

Resistive speaker basket

Resistive speaker baskets precisely control airflow so the headphones pro¬duce natural sound.

The internal speaker baskets encasing the P7’s drive units are perforated with air vents covered with a resistive mesh. This unique design allows for precise control of sound radiation from back of the drive unit, resulting in a more uniform, piston-like movement.

Braced speaker baffle

The braced speaker baffle eliminates unwanted vibrations so the head¬phones produce clean sound without distortion.

P7’s speaker baffle plates are constructed from a polymer material that has been heavily braced and tuned to make it very rigid and inert. This limits any resonances that might colour the sound of the head¬phones.

Light voice coil

Light voice coil so the speakers can move freely and produce detailed treble.

P7’s voice coil is constructed from a cop¬per-clad aluminium wire. This low-weight voice coil means that the drive unit can move freely, for extended high frequency dynamics

Damping material

Damping material eliminates unwanted internal reflections allowing the head¬phones to produce clean sound without distortion.

Damping material inside the speaker enclo¬sure helps control and dampen unwanted internal reflections, reducing colouration and distortion. Bowers & Wilkins engineers have conducted exhaustive tests work¬ing with different combinations of damp¬ing materials, to ensure the best possible performance with P7.

What Is Covert Surveillance

Posted on April 14, 1988 Updated on September 24, 2014

This was originally posted on http://www.wisegeek.com/what-is-covert-surveillance.htm, credit should go them as this is a interesting article.
Covert surveillance occurs when someone or something is being observed without knowledge. People who are under surveillance are most often under suspicion. Locations and buildings are primarily observed because of suspicious activity or to obtain information about a suspect.
Covert surveillance is generally performed by government agencies, private investigators or business owners. Intelligence organizations such as the Central Intelligence Agency (CIA) of the United States and the United Kingdom’s Secret Intelligence Service, also called MI6, participate in surveillance to obtain information for national security interests such as counter terrorism. Law enforcement agencies such as the United States’ Federal Bureau of Investigation (FBI) or the International Criminal Police Organization (INTERPOL) also perform surveillance. They concentrate on observing suspected criminals.

Private investigators perform covert surveillance for a variety of reasons. Husbands and wives hire private investigators to prove or disprove suspected infidelity. Businesses hire private investigators to observe employees who are suspected of fraudulent activities or former employees that may be breaking confidentiality agreements. Insurance companies are notorious for using private investigators to put claimants under surveillance to ensure they are not submitting a fraudulent claim.

Many business owners participate in covert surveillance of their employees and customers. Observing employees while they are working gives business owners valuable information, such as employee production and employee theft. Covertly observing customers can aid in marketing and research efforts and most importantly account for loss due to theft in retail businesses. Retail businesses can also use information obtained through covert surveillance to prosecute shoplifters.
A surveillance operation may be carried out in a number of ways. Agency employees and private investigators may choose to observe a subject without the aid of sophisticated technology, using things such as binoculars and cameras. However, in an age of modern technological conveniences, it is safer, cheaper and more convenient to use surveillance equipment.

Closed circuit television systems (CCTV) are one of the most popular ways to carry out covert surveillance. Cameras come in all sizes and can be placed inconspicuously almost anywhere. In order to obtain audio, wire taps can be placed on phones or audio surveillance equipment or earpieces may be hidden in a suspect’s office, home or vehicle. Other ways to perform covert surveillance include aerial surveillance and the use of global positioning systems (GPS). A GPS placed on a person or moving vehicle can be tracked to monitor movement to specific locations. Similarly, aerial surveillance carried out by national governments can track objects on the ground.

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