maximum power transfer

[Bhuvanesh123]

if u have 8 ohm load resistance(speaker) in series (voltage divider circuit) with another resistor(?)

what resistance do u choose same 8 ohm as load or less or high
i have heard by many to choose same but i dont know reason.plz explain me detially.thank you in advance

 

[jossion]

Hi,

It depends on who is going to drive the speaker. ideally the speaker impedance should match with the amplifier output impedance for maximum power transfer. Just search for maximum power transfer theorem to understand this concept. But i don't understand why you need series resistance for the speaker.

 

[kam1787]

I am also likewise baffled by the post. Moving coil speakers have an impedance - not resistance, and the impedance varies as to frequency. Why a voltage divider circuit? to drive headphones?

 

[Audioguru]

For an 8 ohm speaker, the output impedance of a modern amplifier is extremely low, 0.04 ohms or less so that it damps the resonances of the speaker.
Therefore the amplifier is a voltage source and maximum power transfer IS NOT DONE. Look at damping Factor in Google.

If you do not care about the sound quality then match the impedances then the speaker will resonate like a bongo drum but the power transfer will be as good as is possible.