Comparing headphones,
I have the
Sony MDR-V600 and the
Etymotic ER-6i. I pared both with an iRiver MP-550 CD Player. No headphone amp since they are both very easy to drive.
The ER-6i are far better when it comes to detail, clarity, low end, etc. With them it is easy to differentiate a good recording from a bad recording or a MP3 ripped at 128kbps from one ripped at 320kbps. They play painfully loud and I cannot detect any distortion in the sound. The Noise isolation is phenomenal and since it is passive, it has no impact on the sound. On the down side, it takes some getting used to having something shoved in you ear, indeed the first few days were painful even. But now (about 2 years down the line) I can wear them indefinitely. They are also prone to cable scraping being very loud and disruptive. In general though, they are well worth the suffering and minor hindrances.
The Sony V-600 win out in tactile feel. Pretty much that’s all they have going on for them compared to the ER-6i. The V-600 were soon relegated to the office for non-critical listening use.
The other day I bought my wife the
Sony MDR-EX71SL hoping to give her the gift of better quality than the iPod earphones. I have to say, I was thoroughly under impressed. Very crappy sound in all aspects, but She was happy, so I let it go.
Sound quality is a follows, ER-6i at $130 is best, followed by V-600 at $100 (when I bought it, now available for $70) and the EX71 were the worst. No surprise there, except how bad the EX71 were for $30. I am tempted to say the iPod headphones are better.
Comparing headphones to loudspeakers,
The speakers win out in soundstage, naturally. The drums, guitar, piano, etc. sound like they are in the same room. The ER-6i phones "feel" more accurate, and the bass is way more tight, but they will never equal the effect of the system in terms of putting you in the "middle" of the music.
I use the ER-6i as my reference for critical listening. My room does not have near the flatness in response when compared to the phones and CD player. I use the system for critical listening also, but playing the same track on the phones and the system, back to back, reveals imperfections due to my room's acoustics.
Maybe some day, with room treatments, better equalization, etc. I can get the best of both worlds, the accuracy of the phones in the soundstage of the system.