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Low Impedance... what is the advantage?

post #1 of 6
Thread Starter 
I have read many threads on this forum pertaining to impedance. but i dont understand one thing.

there are some famous brands like grado and denon that have quite expensive low impedance headphones.

what is the advantage of having low impedance on headphones.
post #2 of 6
certainly for battery power, you only get ~ 1 Vrms from an iPod which regulates the 3.6 V LiIon single cell V down to 3.0 V ~= the pk-pk value

likewize 2 cells of ZnC are 3.0 V to start - most rechargables are only 1.2 V/cell

with low source V the load impedance has to be low to draw high enough current to add up to some usable power ~ 30 mWrms for 32 Ohms with a 1 Vrms source
post #3 of 6
Read this forum, it really explains things well and even has a excel spreadsheet in it somewhere to help seewhat it takes to drive different headphones.
http://www.head-fi.org/forums/f133/w...-drive-417086/
post #4 of 6
THe advantage is being easy to drive from portable sources, or without an amp. There are a few exceptions to the rule, but they tend to be expensive full size phones as well, so don't immediately fit in the portable / entry level category.
post #5 of 6
Thread Starter 
@Drubbing
some of the well known headphones among audiophiles like Grado and Denon are low impedance. And from what i have read, they require an amp to bring them to their full potential.

I just bought a pair a Denon A HD 2000 and without an amp they dont sound that impressive.
post #6 of 6
Quote:
Originally Posted by neeravagl View Post
@Drubbing
some of the well known headphones among audiophiles like Grado and Denon are low impedance. And from what i have read, they require an amp to bring them to their full potential.

I just bought a pair a Denon A HD 2000 and without an amp they dont sound that impressive.
I know. All the Grado's are 32ohm. They all improve with an amp, but none actually require one to sound very good. Although if you bought any of the RS range, you'd want to add one to get full VFM.

And the major benefit with these over high impedance phones, is they are easy to drive - they don't require a high end, powerful amp to deliver their full capability. An amp to match them for best sound? that's another thread.
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