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3^Bi-wired^A speaker with seperate terminals to connect it's woofer and tweeter to the amplifier.^|43^Analogue^A signal that is as exact replica of the original sounds waveform. An example of an analogue device is a cassette deck.^|44^Impedance^The resistance, measured in Ohms, offered to AC (alternating current) signals by a component. In loudspeaker specifications 8 Ohms is the norm, 6 Ohms is becoming more popular, but be careful with low-impedance 4 Ohm speakers because not all power amplifiers are happy driving them.^|45^RDS^Radio Data System - This is fitted to some tuners and car radios (where it's genuinely useful ) and supplies some additional information and controls signals to the tuner^|46^Sensitivity^When quoted in loudspeaker specifications, this tells you how easy a job the amplifier have driving the speaker. Measured in dB (decibels), 88dB is average, 84dB is low (so get a big amp!), and 90dB or above is very high (so a little amp will do).^|47^Tweeter^A loudspeaker's high frequency drive unit. Produces most of the treble.^|48^Watts^Used to specify amplifier or loudspeaker power handling.^|49^Woofer^A loudspeaker's low frequency drive unit.^|50^Amplifier^Hi-fi component (or any electrical circuit) that boosts signals. An amplifier is required to connect a cd player to speakers...and so on.^|51^Multiregion^This term means that the unit is capable of playing discs from anywhere in the world. The world is split into 6 regions. DVD players and discs sold within Europe are region 2. America is region 1 and so on.^|52^Multi-region^This term means that the unit is capable of playing discs from anywhere in the world. The world is split into 6 regions. DVD players and discs sold within Europe are region 2. America is region 1 and so on.^|92^WMA 9 Pro^The first digital surround sound coding technology for the Web, developed by Microsoft. When connected to a multi-channel-equipped PC, you are able to enjoy high resolution stereo or 5.1-channel surround audio at 128 k - 768 Kbps compression rates. At any given bit rate, 5-channel WMA9 Pro will bring you higher fidelity than other sound compression algorithms thanks to the latest audio codec technology.^|93^WMA 9 Pro^The first digital surround sound coding technology for the Web, developed by Microsoft. When connected to a multi-channel-equipped PC, you are able to enjoy high resolution stereo or 5.1-channel surround audio at 128 k - 768 Kbps compression rates. At any given bit rate, 5-channel WMA9 Pro will bring you higher fidelity than other sound compression algorithms thanks to the latest audio codec technology.^|94^HDMI switching^An excellent feature that allows multiple HDMI devices to be connected through and amp and then 1 HDMI output to be connected to the TV. This will allow anyone who has a single HDMI connection on the TV, to connect several via the amp. The number of devices varies between models.^|96^PRFC^Test^|108^DTS-HD^High definition Audio sound track on an bluray disk that is designed by DTS and probably the best sound track available.^|