I bought some Beyerdynamic DT880 Pro's, that I will be using with my Axe FX II. I received them yesterday, and my Axe II won't be here 'till today, so I haven't been able to use them together yet. They sound very detailed, but the bass response just isn't there. Not sure if I am used to cheap headphones' hyped bass, or if they need burned in. I left them on last night for around 6 hours on this video on repeat: New Speaker/Headphone Burn In Track. Pink Noise, Brown Noise and White Noise. - YouTube which is white noise, brown noise, and black noise, I believe. I have read that you should do frequency sweeps, but I have also heard that frequency sweeps can ruin your headphones if you are not careful. Any suggestions would be very much appreciated. Thanks!