voltage divider with diode

[Guest bhuvaneshnick]

i have seen voltage divider circuit with loudspeaker and diode.why they are using diode instead of resistor.explain me basically.Thank you in advance

[audioguru]

i have seen voltage divider circuit with loudspeaker and diode.why they are using diode instead of resistor.explain me basically.Thank you in advance

On the other website forum I asked you to post the schematic but you didn't.
I think it is part of the bootstrapping of the driver transistor's collector load.

[Guest bhuvaneshnick]

i have no schematics.what i want to know is if we want transfer maximum power to lead(loudspeaker)we have to match source resistance with load resistance.but speaker resistance changes with frequency.so i am recommended to  use diode instead of resistor.but i dont know why.Thas my question

[audioguru]

An audio amplifier NEVER transfers maximum power to a loudspeaker because then the amplifier output impedance must be as high as the speaker impedance. Instead an audio amplifier has an extremely LOW output impedance so that it damps the resonances of a loudspeaker.

Audio amplifiers usually have a high "damping ratio" (look in Google) with an output impedance of 0.04 ohms or less for driving an 8 ohm speaker. The extremely low output impedance is created by complementary emitter-followers at the output and lots of negative feedback.

If you feed a loudspeaker through a series diode then it will produce EXTREME distortion.