dnnaudio

Ok that's clear. Thanks much - i've got some thinking to do.

Thanks Mackie, that's the info I was hoping to get. When you say it's feeble sounding do you mean the 250ohm Beyer can't be enjoyed at all used straight from the ipod (or similar mp3 players). Sort of the supplied stock earbuds would sound even better? I only listen at low volumes up to moderate so I really don't need it to go loud. At the same time I plan to get the most of the DT990 by researching and buying the top recommended amp for this and hopefully achieve excellent fidelity - to be used for serious listening. So i'll be using it perhaps 50% of the time unamped for casual listening, and the other half amped with serious gear for serious listening. The obvious solution is probably to get both 32ohm and the 600ohm but i'm hoping the 250ohm is an acceptable middleground.

Portable use is not important to me. Casual listening would probably be at the front porch, while reading a good book. Serious listening would be in a comfortable living room couch, doing nothing but listening to music. I am leaning towards the 250ohm version since that seem to be the safe choice as the reviews so far I pressume used this standard version. Once I get these phones and if I end up liking its character I plan to get some serious amp and source for it. That's why I don't want to get the 32ohm version if it means sacrificing ultimate performance when fed with a good amp. Got a response from Beyer just now: "I do not have too much time, but sufficient for a little explanation about impedance. For sure this is not a marketing trick and can be verified by simple physical measurements. Here again for different purposes people prefer diverse impedances. Basically differences in impedance are a result of variation in diameters of copper wire used for the moving coil - the core of the headphone system. Less diameter without having a longer wire ends up in higher impedances and less weight for the system of diaphragm and moving coil, what generates a lower damping factor especially for the highs. So fidelity of impulse and phase are the best with the 600 Ohm version. The other side is, that with an increasing impedance you need a stronger amplifier providing more power for the headphones. A little example: you want to use your headphones with your iPod - the best way in this situation is to choose the 32 Ohm model as it appears "louder" with the built in headphone amp inside the device. But please do not believe in every story on the internet give you by the hifi "experts" - physics cannot be changed at all. The problem within your plan is, that you want to use the headphones for both purposes - portable and highend hardwired. So the only advice I can give to you (I estimate you`re not willing to buy two pairs of them...) is to buy the 32 Ohm version and use them with a low amping at home." They seem to suggest the 32ohm.

Hello forum. My 1st post. After a bit of research here and headfi i've decided to get a DT990 2006 edition as my first serious headphone. Initially I will just use this with a portable MP3, but eventually I plan to get a decent amp and source. Question - Between ordering the 32, 250 and 600ohm versions, which one should I go for if my objective is to be able to enjoy this with an unamped MP3 player for casual listening while at the same time achieve greatest sonics when serious listening using a good amp and source? My current phone is a PX100 and I rarely listen loud, mostly soft listening sessions. I emailed a similar question to Beyer 2 days ago but received no response.