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The objective of a sound system is to obtain good frequency response which is the role of the speaker. If the speaker has high impedance, which would mean many turns of wire in its voice coil, it would reject high frequency notes due to high inductive reactance. A low speaker impedance requires a low output impedance from the amplifier to maximize the energy transfer from the amplifier to the speaker.
A drawback to low impedance systems is that the wiring current is higher between the amp and the speaker and long runs will encounter a significant power loss in the resistance of the wire. That is why some amplifiers will have a 70 ohm output so that the current will be lower. Then, a 70 ohm to 8 ohm impedance matching transformer will be located at the speaker.
What else can I help you with?
What is the function of a buffer amplifier in electronics?
A buffer amplifier can be used to transform high input impedence to low output impedence, or vice-versa.
What is output impedence?
Newer heard the word "impedence". An output impedance is an AC resistance at the output of an electronic device.
Could you briefly explain the applications of FET?
Due to its *low noise *high input impedence and low output impedence FET is used in numerous applications. *Buffer ampliier *Phase shift oscillator *Integrator *Amplifier
Why output impedence is high in opamp?
Output impedance in an op-amp is not high - it is low - input impendance is high, and this is because the input stage transistors have high gain.
Why output impedence should be low?
Never heard the word "impedence".To get all the audio voltage from a source to a target without loss you need voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is at least ten times higher then the output impedance.An input impedance is called also a load impedance or an external impedance.An output impedance is called also a source impedance or an internal impedance.
What happens if a high impedence amplifier is connected to a low impedence speaker?
Scroll down to related links and look at "Interconnection of two units" and find the picture of the amplifier and the loudspeaker. Learn about "voltage bridging" - Zout < Zin. There are no power amplifiers with a high impedance output.
Conditions for faithful amplification?
1. Signal to noise ratio should be low at the amplifier outlet. (Vaccuum tube amps are best.) 2. No distortion at the output due to the amp being overdriven. 3. Impedence matching at the input and output.
The definition of the term 'characteristics of a transistor'?
It can be used in 3 configurations, common emmiter, common base, common collector, in which common emitter is most widely used configuration.Its a 3 terminal device.It can be use as an amplifiersIt is use in all digital logic familiesHigh input impedence; low output impedence
How do you get input impedance and output impedence of op amp?
Scroll down to related links and look at "Measurement of input impedance and output impedance".
Why CB amplifier preferred for high frequency than CE amplifier?
1)in cc configuration we use to get the low output impedence where as in ce we use to get the high output impedence. 2)in cc amplifier we use to have the voltage gain equal to unity where as in ce amplifier we use to have the high voltage gain. 3)in cc amplifier there is high power gai which is used for impedence matching where as in ce amplifier due to the high voltage gain the impedence matching is less impossible.
Does a Digital Voltmeter have a high or low input impedance?
Digital voltmeter has high input impedence.
Plug electric guitar to acoustic amplifier?
Yes, you can plug an electric guitar into an acoustic amplifier. But I would suggest that you don't play at a high volume for a long period of time of the difference in impedence - an acoustic guitar (and bass and vocals) is low impedence, where an electric guitar (& keyboard) is high impedence.
