I've owned both, I'll give you the pro's and cons of both:   Momentum: Better build quality, sound isolation and portabillity   HD 598: Better sound in every way except bass impact IMHO. HD 598 has way better sound stage and sounds clearer to me. Costs a lot less than a momentum also...

I returned my momentums to the seller for a full refund, I really liked them but they were uncomfortable. The ear cup size is very small. I Always considered myself to have pretty small ears but on the right it just wasn't comfortable. The cups are much smaller than expected so please do...

  You are probably right, but the matter of fact was that I had money for one pair of headphones and wanted to see the pro's and cons of both these headphones. 

I've had the HD-598 for about a month now and I must say that I am really satisfied with these headphones. Extremely comfortable, maybe a tiny bit loose (wen I bent over a book while studying they slip down a tiny bit) but in general very nice headphones, I would recommend these. 

I've owned a pair of HD650's which I sold last week because these aren't really ment to use without an amp. I do own an amp but I've decided I want something easier to drive so I can use them connected to my iPad and things like that without carying around an amp which needs to be charged etc. 

They are definitely for home use only, I have pair of sennheiser IEM's that I use on the go. I like to travel light so I can't be bothered to carry around full size headphones. The headphones won't be for watching movies only, I will also listen to music on it. 

It would be the first pair of headphones i'd return so that should be fine. thanks for the heads up though. 

I am leaning towards the HD 598 very much. I actually have an amp but I can't be bothered to carry it around the house and charge it all the time. I am wondering if the HD 598 would be suitable for watching movies on my Ipad without an amp. 

Okay, So I bought a pair of sennheiser momentums and used them over the weekend. In short I like the sound, I don't like the comfort. The Earcups are really very small and will get uncomfortable after a while of use. I thought I had small ears but appearantly not small enough for a comfortable...

I've purchased the momentums this weekend, I like the sound very much but comfortwise they are not that great in my opinion. The ear cups are a lot smaller as I had expected and they do get a bit uncomfortable over time and your ears will get a bit warm(I thought I had pretty smal ears but...

I forgot to mention, I'll probably use it at home for 98% of the time. I am actually also considering the HD 598, the airiness might be nice. 

Greetings,   As the title says I am looking for some over ear headphones that do not require amplifieng. I've just sold my sennheiser HD 650, I loved the sound of those cans but I am not using it as much as I should simply because I move around the house a lot and I would like being able to...

I will, since the headphones are shipping from Spain and only were sent to me yesterday, it will probably take about a week or something like that before I will receive them. I'll post how I like them, right now I am trying to find out which portable AMP I should get with them in the future...

Thanks for the tip Blueangel2323! 

I've made a deal on a second hand HD 650, if everything goes well it will probably arrive somewhere next week.