Ummm... about 2 years and AKG says they don't need any burn in. They are ready to go right out of the box. I get a signal from my interface, a direct out, should be the same as the signal sent to my reference monitors, excepting that it is an amplified headphone output. Just about as close to it as I can get.mazz wrote:They seem to be fairly flat, +/- 3db in certain ranges:t4mh wrote:I have a set of AKG K-701 Reference Headphones that I use to double check mixes as well as critical listening tasks while tracking and production work. These headphones are FLAT FLAT FLAT and take the "Room" completely out of the equation. They are so flat that nothing really sounds excellent on them. But, if I can't hear something or something else is too loud in a mix I can instantly hear it because being a true reference device they are absolutely true to the mix. This of course cannot compensate for hearing loss or fatigue. A direct line out from the mix bus is also helpful.
Get yer money ready...
HTH
Keith
http://www.headphone.com/headphones/akg-k-701-white.php
The stereophile reviewer said they needed to burn in for about 100 hours, how long have you had them and did you burn them in? I'd be interested to know. Also, how are you driving it? The reviewer also said that a fairly high quality headphone amp would be a good match for them. My Benchmark DAC has a very high quality headphone amp in it and my Ultrasone Pro 650s sound really awesome driven by that.
The Ultrasone 650s certainly have a much different response graph than the AKGs:
http://www.headphone.com/headphones/ult ... ro-650.php
I don't use mine for mixing so "flat" isn't as critical for my uses but I do like to be able to hear things like reverbs and clicks and odd bass stuff and the Ultrasones work well for that.
Mazz
HTH
Keith