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Speakers in general have impedances between 4 and 8Ω, headphones between 32 and 300Ω. Since the impedances of headphones are higher than those of speakers headphones need less current so all power amplifiers have absolutely no problems to provide the needed current.
#Speaker power amplifier how to#
yes and no depending on the circumstances.īelow there is a lot of technical bla bla about powers and resistor values etc.Īs most readers just want some info on a practical attenuation box for general purpose headphones you can skip most of what’s written below and go to the bottom of this page.There you will find how to connect a few resistors and what values you would need.Īmplifiers that drive headphones need to be able to deliver enough voltage to drive the headphones but not too much to fry them. Power amplifiers can deliver enough voltage. No, When the amplifier used is of a so called ‘bridged’ design, such as a lot of class-D and car-audio amplifiers, unless 4 wire headphones are used. No, because of noise which could be higher than dedicated headphone amplifiers and could become audible. No, because most low impedance headphones run a a high risk of being burned to a crisp when left unattended and the volume is accidentally turned up. Yes, when similar measures are taken as those found in most power amplifiers with a headphone socket. Yes, because some ortho-dynamic headphones need a lot of ‘power’ which can be delivered easily with power amplifiers. Yes, because high impedance (> 300Ω) headphones can be connected directly to power amplifiers without damage Published: Apr-5-2013, updated: Aug-31-2019Ĭan I use the speaker output terminals of a power amp to drive headphones ?
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