difference between premier and authentic nhl jersey Believe the Hypex
Amplifiers come in all shapes and sizes, from the de facto stereo amplifier to luxurious A/V receivers offering up to 7 channels and a plethora of features. Obviously there are also amplifiers that don’t come fully assembled but can be bought in kit form and hence can be constructed tailored to your exacting needs. Hypex is a Dutch manufacturer of amplifier kits that are distributed worldwide by a network of dealers that also supply the do it yourselfer with loudspeakers, filter components and similar products.
Although Hypex is known for their subwoofer plate amps they’ve recently endeavored to offer kits that allow you to construct your own full range amplifier. What’s interesting about the kits that Hypex offers, however, is the fact that these are not your run of the mill amplifier kits. They’re based on a whole new amplifier technology called ‘class D’. Conventional kits regularly use amplifier technology dubbed ‘class AB’, which has powered the majority of amplifiers over the past four decades and has basically reached a point where further improvements are unlikely.
Enter class D, which sets a new standard. Although class D is often referred to as being a ‘digital amplifier’ that’s not an accurate statement at all. There’s nothing digital about these amplifiers, so the ‘D’ in class D has no relevance to the word digital. In essence the amplifier works much like an AM radio. The amplifier oscillates at a given frequency,
usually around 400KHz, which is called the carrier frequency. The audio signal is then mixed in with this carrier frequency, so the carrier frequency becomes amplitude modulated (AM) by the audio signal, similar to AM radio signals.
This mixed signal is then amplified and fed through an output filter. This output filter, which is a classical 12dB/oct. low pass L/C filter, will filter out the carrier frequency; hence the net result available at the amplifier’s output will be the amplified audio signal. Class D offers a number of advantages over the established amplifier technologies such as class AB. A distinct advantage of this technology is the fact that distortion is kept at a set level across all frequencies. Another advantage is the high efficiency (90%) requiring less cooling, less stringent power supply constraints and enabling smaller amplifiers to be built.