This is commonly referred to as "soundstage" or sometimes "headstage". One of K55x's characteristics is a large (for closed headphones) sounding stage. It's not a defect; it's a defining characteristic of the headphone.
I know a few people who don't like open-sounding headphones. They don't want to be second row at Carnegie Hall. They want to be on stage with the band in a club that seats 10 people. That's fine. And if you're among them then that's fine. That doesn't make K55x a low-end headphone or a bad headphone. It's just not your headphone
Note: "transparent" has a specific meaning which doesn't apply to what you're describing. It means a device has frequency response that is flat to within 0.1dB from 20Hz to 20kHz with less than 0.05% total harmonic distortion. I'm unaware of any headphone that meets these criteria and I'm sure that if one existed it would be the worst-sounding headphone ever made.
Sorry it took me a while to reply. I'm not talking about soundstage. I'm not talking about in your face or out there presentation. I don't know how to explain it. I know what soundstage is and I prefer large soundstage. I'm not in your face front row kind of person at all. I love huge soundstage. It is one of the most important aspects in a headphone for me. That is one of the reasons k550 was disappointing. To my years more distant presentation with huge soundstage gives more speaker like presentation. And when people talk that k550 has a big soundstage it makes me disagree.
To my ears Takstar Pro80 has a a larger soundstage for a closed can, significantly more expensive dx1000 has even larger. T1 has a nice soundstage for a semi open. So does dt880. Sa5000 has a small soundstage atleast for a semi open, but it has so much credibility and pinpoint accuracy that k550 lacks imo.
I'm not saying that k550 is a bad headphone. But I don't think it is that good either. Pro80 has more bass and bigger soundstage. Pro80 has over boosted highs, k550 has other problems with the highs. I'd say these two are quite evenly matched (allthough I personally prefer funner sound of pro80) but considering pro80 is half the price there is no contest.
I'll try to explain the "blackness" I mentioned before. Imagine a performance with cellist on the right doing his thing. Suddenly there is viola on the left and when the viola player started you can immediately tell the empty space and distance between the cellist and the viola player. All the sudden there is a third guy with a violin at the center and you can easily tell he is way deeper on the stage and you can tell he is 2 meter away from the viola player and 3 meters from the cellist. Then you hear a triangle on way way back and all of a sudden whole orchestra joins in somewhere between the triangle player and the violinist. All those players and sounds came out of nothingness, music appearing out of thin air. You can sense the space between each player. You can hear it so clearly that you can easily visualize it all in you'r mind. For me K550 doesn't do it. Not that any affordable headphone does.
Those kind of things are something that most people don't even pay attention. And you don't know of that stuff unles you have heard a system that is capable of doing that. You don't miss something that you have not heard. For the price K550 sells it is not even supposed to be capable of that. Not even for it's original price. That lack of "blackness" and realism was something I thouhgt should be brough into this convertisation. K550 gets so much praise that I thought it was about time this was discussed. It is a nice headphone. Decent at it's price range. But to achieve more it is not going to happen with k550.
It is likely that I would be more mercifull to k550 if it did not have such rave review. I expected alot only to find it to be on level of pro80, hm5 and other well known cheaper closed backs.
I have not heard Etymotics or V6. I did audition sr80, I liked it but though it was not worth the price. To my ears Takstar HI2050 sounded clearly better for third of the price. I did have sr125 which was on par with hi2050 but especially for more realistic soundstage I would go for HI2050. I did own some old DT990. It was nice but I sold it after a week. Compared to DT880 premium 600ohm it was disappointing. I've never heard Q701 but I did own K701. I greatly preferred hd600 to akg's.
First time I've heard that defination. For me transparency means the ability to hear/see into the music. The way you forget your gear and only music is left.