College】 【weak right amplifier output terminal connection method --- Power By 【China】 weak home network.

<br> present, the power amplifier for the public address system there are two: <BR> one is scheduled to stop outputs, such as the output resistance is 250Ω, the load required to connect multiple speakers to be calculated through the impedance converter, .with, to ensure that multiple speakers in parallel after the load impedance is equal or close to 250Ω, to achieve the best match. .<BR> The other is the constant pressure-type output, the international standard for the output of 100V or 70V, the output of certain products of domestic 120V. .Because each radio is equipped with loudspeakers have been determined based on the size of their power transformers, the use of constant voltage-output amplifier connected to multiple load speakers, just like the installation of lighting the lamp, as one by one in parallel, connect easily, so it .a public address system equipment configuration of the established formula. .<BR> Using constant pressure-type power amplifier output, usually in the back panel has a 100V, 70V, 0V terminals for use with different power output. .So, how should we in the project is properly connected it? .Let us illustrate: <BR> <BR> engineering application one: use a fixed office address system amplifier output compression, back panel of the 100V, 70V, 0V terminals, with the AMAPC-865B Ceiling Speaker .5W output power, with 100V transformer. .The correct connection method is: to ensure that all ceiling speakers and non-load power of the power amplifier output power of greater than 80% of the premise, all the ceiling speakers of the positive and negative terminal, respectively, and then up, then connected to the amplifier .0-100V terminal, then power output ceiling speakers 5W; ceiling speakers if all the positive and negative terminal, respectively, and connected up, connected to the amplifier 0-70V terminal block, then the power output ceiling speaker .reduced to 2.5W. .<BR> <BR> Engineering application two: a residential area broadcast system used constant pressure-type power amplifier output, the back panel of the 100V, 70V, 0V terminals, equipped with lawn mushrooms speaker output power of 15W, 70V available .transformer. .The correct connection method is: to ensure that all lawn mushrooms in the load power of the speaker and not more than 80% of the power amplifier output power under the premise of lawn mushrooms all the speakers are, respectively, and pick up the negative side, and then connected to the amplifier .0-70V terminal block, then the lawn mushrooms speaker output power of 15W; lawn mushrooms speakers if all the positive and negative terminal, respectively, and connected up, connected to the amplifier 0-100V terminal, then the speaker output power lawn mushrooms .into 30W. .At this time, turn up the volume, most likely burned speakers. .<BR> <BR> Engineering application three: a school broadcasting system made use of early-type output of the power amplifier constant pressure, the back panel of the 120V, 0V terminals are equipped with wall-mounted frets 30W output power, with .100V transformer. .In such situation does not match the output voltage, directly to the wall if access to 0-120V Yinzhu terminals, since the input power is beyond the frets 20% of rated power, open the volume, is likely to burn frets. .<BR> Order to avoid damage to equipment, should be taken to change the output power of the flexible approach frets. .Yinzhu generally have two wall-mounted, three-tap to choose different output power, such as: AMAWS-83030W Yinzhu wall power output with 30W, 20W, 10W, 0 three-tap. .<BR> The correct connection method is: to ensure that all wall-mounted in the load power of the frets and not more than 80% of the power amplifier output power, under the premise that all wall-mounted Yinzhu of 20W, 0, respectively, and then end up .then connected to the amplifier terminal 0-120V, then the output power of wall-mounted frets as 26W, and can basically meet the demand..