Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: How do these compare to the sr125i's?
Document: I listen primarily to rock/indie on laptops and compared this side by side with the 32ohms beyerdynamic 990 headphones. I wanted to also compare the sennheiser 598, but having the senn 497 for 10 years, I think I had an idea of what it would sound like.1. Sound. The grado's sound more alive for most rock songs. The bass doesn't reach as low, but it seems more controlled and distinct.
they are incredibly solid for sound though. 4.5/5
there is simple a warmth and life that the others dont have. everyone who gives mine a listen are always totally amazed.the highs are perfectly present. the lows are perfectly defined. there is a small mid hump that grado is known for. it actually brings out vocals better. as some others have stated, you can hear the slightest sounds in recordings. i have heard things like people in the crowd talking, musicians whispering to each other, you can even tell when they lick their lips.
the quality of the sound is every bit as advertised. after all the research and all i put into this, i was pretty satisfied with how it lived up to my expectations.the only down side is that it is pretty bulky. ears start to hurt after a while.other than that i highly recommend it.
the head band is of very simple construction. basically a strip of metal covered by cheap plastic. the drivers dig into your ears after about an hour. there was no intention of comfort when these were designed.its clear that the only consideration was for sound quality. there are nicer looking cans out there. i've had people ask me "where did you get those old headphones?" all that being said, fidelity is completely separate from how something looks or how comfortable it is.
the clarity is incredible, you will hear EVERYTHING in the mix.Don't hesitate, get these cans!
such as improved diaphragms which are put through a special "de-stressing" process in order to enhance detail, voice coil design and UHPLC (Ultra-high purity, long crystal) copper voice coil wire, when I heard those same sounds such as the thunderclap, I DID jump out of my seat! And the sound of rain is so detailed, amazing and comforting. And classical music is even more amazing than EVER before.
quality headphones like these should NEVER fall apart on their own when all I do is put them on my head, and then leave them on my desk when i'm done. They never folded up strangely or are thrown inside a backpack - they simply rest on my desk or on my head.When the second ear came off today I came here hoping for a refund. Looks like I'm a bit screwed, but hopefully I've warned off potential buyers so Grados can get their act together in the future.
just a heads up.But overall, these are amazing headphones for $200.A great buy for someone looking to improve there sound quality even from the highly praised M50's.
if you want comfort drive a mini van.What kind of person will enjoy these? the person who wants no compromise in sound, affordable price and could care less what they look or feel like.Note: they are open air, meaning they offer no isolation. this does however give the best sound. go put a cup on your ear and listen to she "sea shell" sound. open phones make open sounding music. also, the connection is 1/4' instead of the normal 1/8'.
Answer: I have never done a side by side comparison of the two but based on the specifications of each model it's safe to say that the differences would be noticeable. The 225i's are, in my opinion, the single best headphone you can purchase without having to purchase a headphone amplifier. They have a bit more bass than the 225i's yet retain the mid/high soundstage that is so typical of Grado. The upgrade will be in vocals and bass.Basically, I absolutely think it's worth the extra coinage to purchase the 225i's.