Ultimately, this is easy, but before that the explanation I need to issue a warning. Multiple sets of speakers is not usually directly to a standard audio amplifier will be connected, without any type of impedance matching. This is in reference to those individuals who want to run speakers in multiple rooms at the same time (distributed audio) might. If multiple sets of speakers from the speakers are running, the amplifier is usually overheating and shutdownand can blow the output stage (see note 1). These comments do not apply to 25 or 70 amp style volts output, requiring special transformers PA speakers.
The right solution is either a matching impedance selector with the protection enabled, or use wall impedance volume controls. Note the emphasis in the sentence above. This is because most speaker selectors are made with a dangerous feature: a button, front right, disablingSecurity. When the switch is in the back to avoid turning off the protection on the rapporteur, it would be much better. If the protection is turned off accidentally while running multiple pairs of speakers off the amplifier is turned on, the output fuses, and very well may be the final stage of the amplifier can be damaged. There are only two reasons to turn off this switch is the most important is that the impedance matching volume control is used on all pairs of speakers. OtherWould result if only one pair of speakers in use, eliminating the need for impedance. In this case, though, so the protection is effective only in very small difference to make the sound, so why not let on?
Remember this: Only one set per pair of terminals (usually red and black) on the amplifier. Do not try to use a surround amplifier, several surrounding areas with a space in the middle of feeds, a back room, etc. This is because asDistributes as a surround receiver you can end only with the voice in a room and only the music to another! The right connection to a surround receiver brings surround sound distributed in the main room and the sound of the main left and right speakers. My recommendation for connecting a surround receiver is as follows. Run the speaker selector from the front left and right amplifier. Hook the front left and right on the first speaker switchSpeaker selector. You must restore the balance of the surround pink noise from the test speaker is selected on the left and right speakers output fell by a small amount. This allows the execution of the main speakers and other speakers connected to the switch speaker selector, a phrase no louder than the others. If your speakers have volume control switch, be sure to use the surround system for movies, the volume control setting is the samewas here to see if the pink noise. You can turn on the speaker hook-switch for the speaker amplifier 'b' when the volume balance between left and right main speakers and the rest of the speakers is not a problem.
Another variation is a direct speaker output amplifiers for Zone 2, 3, etc. This pair of speakers for a hard set, and must comply with impedance, if more couples are to be used to use. The area gives a second (or third, etc.) source, providing, for exampleCD and radio in one room to another.
A speaker impedance selector has multiple outputs from one input and protects the amplifier from damage. Speaker selectors come out 12/04. As long as your amp has enough power, you can push as many sets of speakers as you want. Simply connect the speaker to switch 'A' (or 'B'), the outputs and the rest of the speakers on the speaker selector. You speaker selectors with volume control for each purchaseSpeakers. Another option is the impedance matching volume controls on the wall, that do not require the selection of speakers. Most of these bridges are set during installation, the correct pairing. If you want multiple pairs of speakers to run as the selectors have speakers or volume (usually up to 12 pairs. Depending on your hardware) needed a second amplifier to the second volume group (or speaker selector) to function.
So what is an impedance matching and impedance?(Warning: semi-technical stuff first)
The music signal to the speakers is called alternating current (or AC), because it varies the polarity and voltage. This is compared to a battery, for example, which produces a direct current or direct. You can view current flows as the amount of water in a pipe (the wire) and the power that the water pressure. AC can be used as a flux, the direction and returns to direct current as a constant flow in one direction of thinking. TheThe analogy is not exact, but close enough to get a picture of what happens. House standard is currently in the United States, the direction (polarity) in a range (or frequency) of 60 times per second, measured at 60 Hz (Hertz). When you visit our website, you can include these elements with explanatory diagrams.
The speakers have a certain resistance to flow. Imagine the resistance as a constriction in the pipe, restricting the flow. Do you have a DC resistance, the so-called Voice-CoilResistance and the resistance to alternating current is called impedance. Values of resistance and impedance measured in ohms. Impedance is a complex sum of dc resistance, and resistance to various frequencies of AC capacitance and inductance (typical characteristics of electrical and electronic equipment) causes. It is usually expressed as a nominal impedance of the speaker, and refers to certain frequencies. However, just consider the resistance to alternating current for practical purposes. This is usually a value8 or 4 ohms. Most amps at home prefer an 8 ohm. Each time you add another speaker in parallel the impedance is reduced. View more tubes with the pump itself, the apparent increase of the pump (up to the limit of the pump-capable) connected. The amplifier is the pump. Two 8 ohm speakers reduce the impedance of 4 ohms, four 8 ohm speakers reduce the impedance at 2 ohms, and so on.
An amplifier expected (most require) a certain degree ofResistance to current flow. The lower the impedance, the more current flows through the output stage of a typical amplifier. Usually flows directly through a transistor (or other amplification device) and resistance to damage the transistor or power amplifier. If you're lucky only one fuse blows. The moral of the story is always a speaker impedance selector (or control volume) and your amplifier is always a safe load impedance.
1(Note)
Why is the output stage amplifier blown? This is due to the nature of a typical amplifier. It must first be clear that an amplifier is not really the input signal is greater. What it does is a copy of the latest greatest (higher current and voltage transformers) of the original signal and provides speakers. Does this copy of the supply voltage, which is derived from the AC wall outlet. This tension must first be converted into direct current. If not done efficientlyAmp hum (because they do not know the words). The amplifier controls the power supply through a kind of valve, the output voltage and current controls. These valves (transistors are common, but they can be integrated circuits, tubes or other devices) are controlled by the input signal. In response to the input signal, the amplification device allows more or less current (and / or voltage) through the production of an exact (hopefully) replica of the input signal. InFor most of the speakers with a good amplifier, it needs a low output impedance (see text above for a discussion of impedance). If the output impedance is too high, the frequency response varies with the impedance of the speaker. This means that some sounds are accentuated, and some of the layers to be removed, and this effect will be different with any other set of speakers. In practice this means that the circuit most commonly usedDesign, when the transistor (or other device) is fully up, must spend almost all the available power supply current through it. This is the hardest part. The current flow is essentially determined by the impedance of the connected speakers. Most amplifiers are designed to work with 8 ohm speakers, and can function relatively well at 4 ohms. Some so-called high power amplifier may work well at 1 ohm. In other words, the amplifiers that are designed, if the output transistors are the existence ofcan take full current and voltage that will work for an expected value of the impedance. If the impedance (AC resistance) of the connected speakers is too low, more current must pass through the amplifying device, as it can. Or a fuse blows or shock or burn entering emitter resistors or some other form of damage. Fusing often do not react quickly enough to save the circuit. So why are not all planning systems at low impedances? Without going too far init can result in increased costs of large size. For example, the theoretically ideal performance in most speaker systems of today, if a power amplifier, it is for each halving of impedance to be doubled. So for 100 watts into 8 ohms, should put out 200 into 4 ohms, 400 into 2 ohms and 800 ohms in one (remember, this is theoretically ideal, and almost every amplifier can be an effective doubling of performance for a halving of obtain the load impedance). Most decent amplifiers today have much less 0.5Ohm output impedance, as a good performance with speakers that can fall to the low impedance at some frequencies. Our amplifier theory, it was made to operate in a load of 0.5 ohms, the ability to put out 1600 watts per channel, without damaging anything (in the amp!) Have. As you can imagine the cost of a good quality amp with this kind of ability is remarkable. Now think about this: The average user of this massive amp with 8 ohm speakers, sees only an average performancePower of 100 watts RMS (RMS stands for Root Mean Square and is basically a measure of average power, which is about 70 percent of peak power). For most users, this would be the price as a buffer flow. Some amplifiers are designed for this type of standards, for the reason that the speakers that go down to one ohm, which sound much better if a very high power amplifier driven. One example is the Krell Evolution One, which is a single block. This means that you need two for stereo. Theironly $ 25,000 greater than you re dollar. For those who might think I do this until you use Google to find prices on Krell monoblocks too.
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