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Galaxy Audio G-440 User Manual
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SOUND REINFORCEMENT BASICSThe SPEAKER OUTPUT jacks on the G-Series amps are designed to power up to twoCore (or other brand) 8 ohm speakers, or up to four Hot Spot 16ohm speakers per channel.Most professional-type speakers (like the Core and Hot Spot) have two jacks which arewired in parallel (meaning the signal can travel into one jack and out of the other). Think ofeach speaker as a “load” added to the amplifier, the greater the number of speakers, theheavier the load. Adding too many speakers can overload the amplifier, causing it tooverheat and distort. This will not only sound bad but it can damage the amplifier, thespeakers, or both.One easy way to determine the load on the amplifier is to use Ohm's law, which states:“The total impedance of N speakers in parallel is equal to the reciprocal of the sum of thereciprocals. In equation form:Where Z1 is the impedance (or ohm rating) for the first speaker, Z2 is the impedance forthe second, and so on for every speaker in the chain. This equation calculates the totalimpedance of the speaker system, which should NOT be lower than the minimumimpedance rating of the amplifier.The G-Series amps are rated for loads as low as 4 ohms per channel. Therefore, the totalimpedance of the speaker system must be greater than, or equal to, 4 ohms. Anything lesswill overload the amplifier. For one pair of speakers use the short form of the equation: theproduct of the two speakers divided by the sum of the two speakers is equal to the totalimpedance or the equivalent impedance of the speaker system.This equation may be used to calculate the equivalent impedance for additional speakers intwo-speaker increments. Determine the impedance of the first two speakers, substitute Ztotal for Z , and include the next speaker. Repeat the process until all speakers have beenincluded. The result should be the same as with the first method. A word of caution: polarityrules must be observed when connecting multiple speakers. Polarity will not affect the Z,but can affect the quality and volume of the sound. If you are having problems with any ofthese applications use Galaxy Audio's CRICKET Polarity and Continuity Test Set to checkthe polarity of your cables.OHM’S LAW and the G-Series AmpsZ(Total)=11 1 1 1 1___ ___ ___ ___ ___+ + + +Z Z Z Z Z1 2 3 4 NZ=Z x Z1 2Z + Z1 23 |
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