b'72 TECHNICAL DATA|TYPES OF SYSTEM|STANDARD LOW IMPEDANCE SPEAKERSStandard Low Impedance SpeakersStandard loudspeakers comprise of 3 main components: Since the coil is wound from very thin wire, there is a certain a cone, a magnet and a coil. Passing a current through the amount of resistance to the electricity passed through it.coil causes the attached cone to move forward or backward. This, coupled with some other electrical characteristics,The coil is fed the electrical signal from an amplifier, whichis known as impedance. provides enough electricity to move the cone quickly,causing it to vibrate and make sound.Impedance is measured in Ohms (). Higher impedanceThe amplifier needs this impedance to stop itself from opposes the output of the amplifier more, causing it to deliverover-working and burning itself out, and is an important less power, whereas lower impedance allows the amplifier toconsideration when matching amplifiers and speakers deliver more power. together in a system.Impedance visual representation: 1 2 3The speaker impedes anyThe narrow neck2 narrow necksIf the neck is too wideelectrical current flowingcontrols themakes it half asit offers too little through it, in the same wayflow of sand justdifficult for the sandcontrol, just as that the neck of an hourglassas a speakersto pass through,when the speaker impedance controlsjust as 2 parallelimpedance is too low impedes the sand flow. the flow of current speakers have halfand allows too much the impedance aspower to flow from 1, allowing twice asthe amp, resulting in much power toeventual failureflow throughFor any given amplifier, the impedance of the speakersBasic low impedance set-upattached to it must not be below the rated output impedance of the amplifier and must be rated to handle the power that the amplifier will deliver at that impedance.For instance, a 2 x 100W amplifier may be rated downto a minimum of 4 on each side. However, if an 8 speaker is attached to each side, the amplifier may only deliver 2100W @ 4 100W @ 4x 70W. Therefore, 70W would be the minimum handling70W @ 8 70W @ 8capacity for these speakers.(Please refer to the instruction manual of the amplifier being used to find the power output at 4, 8, etc) + +8 _ _ 870W 70WWhen 2 speakers are connected together in parallel Parallel low impedance set-up(that is + to + and - to -), the electricity from the amplifier can flow through 2 routes instead of one.Having twice the number of routes to flow through effectively, means that it is half as difficult for the electricity to get around the circuit. Therefore, the impedance (resistance to flow) is halved when 2 of the100W @ 4 100W @ 4same type speaker are linked together in parallel. For 2 speakers with 8 impedance, the overall + +impedance (or combined load) will be 4, allowing 8 _ _ 84 combined load 4 combined loadthe 100W amplifier to deliver its full output across 50W 50Wthis pair of speakers.The power will be shared, so each speaker will receive 50W (even though both are capable of handling up to 70W).+ +8 _ _ 850W 50WT0161 749 8180 Esales@avslgroup.com www.avsl.com'