Quote:
Originally Posted by
avii 
Guys will there be any lots of battery drain when headphones are used with iPhone 4 ?
A friend of mine said something about Ohm rating. He has some Brainwavz Headphones and it has 32 ohm rating & his iTouch can handle it. So there any ohm rating for iPhone 4 ?
Thanks in advance :)
No, there shouldn't be too much battery drain. Just running the player will be the biggest battery drain. You might lose some battery life if you have to max out the volume, but it probably won't be very significant.
For ohm rating, as long as you get headphones with an ohm rating of less than about 80-100, you shouldn't have a problem. There are some exceptions in both directions, but just read the review threads for the headphones you're interested in to see if they need an amp. Most headphones designed for portable use are rated for around 30-50 ohms.
Edit: more on ohm ratings - a higher ohm rating just means that you have to feed the headphones more power to get the same volume as headphones with a lower ohm rating. This is also dependent on sensitivity; the lower the sensitivity, the more power required. Using headphones with high ohm ratings or low sensitivity won't damage your iPhone. You just won't be able to get the volume high enough.
Edited by LimeANite - 11/30/11 at 12:08pm