There are so many questions, let’s answer them one by one.

First of all, the sound quality of NANO2 is very poor, even inferior to the domestic Meizu M6. IAUDIO I7 is only suitable for some music, such as NEWAGE, and a small collection of classical music is also suitable (but the taste is not serious enough, not correct).

First, in terms of headphones

1. You can’t even think of using MP3 to push large headphones like the HD650, even if you have a portable amp. This kind of headset is used for PCHIFI and traditional CD machines. PX200 has the ugliest sound in its price range, bar none! The mid-range sound is very strange, and the low and high frequencies are not prominent. It is said to be boiled water, but in fact, the sound is dry. The PX100's low frequency is too fat and its elasticity is not good. Listening to songs with a lot of low frequencies will cause a booming feeling. But the sound is quite listenable. Sennheiser's headphones are mainly high-end large headphones such as HD650, HD600, HD800, etc. The portable headphones are not very good.

2. KOSS PP headphones are for bass lovers. They are a bit boring and the high frequencies cannot go up. But the musicality is okay, the sound is energetic and suitable for rock. The recently released AKG K420 is very good! Absolutely the best portable headphones within 500! The sound is moist and dynamic, the tuning is balanced, and it’s easy to promote!

3. About sound dyeing. In fact, sound coloration is not a bad thing. Shure's earplugs are actually of poor quality among earplugs in the same price range. However, Shure's unique sound coloration makes Shure's earplugs very flavorful. The earplugs or headphones we use now have more or less sound coloration. Even so-called monitoring-level headphones cannot be restored 100%.

4. For your request, I actually recommend AKG K450. Because you are using MP3, large headphones are not possible. As for portable ones, AKG has just released a few models, and Audio-Technica has quite a few. However, the appearance of Audio-Technica accounts for a large part of the price. If you want a wide sound range, depending on your requirements, the most suitable one at this price is Sennheiser's HD595, but it cannot be used for direct push. Direct push can produce sound, but if you want to perform well, you need an ear amp. This thing is pretty easy to promote, just get a portable amp. Headphones are just that, the real sound is HI-END speakers

2. Player part

1. As for iriver and iaudio, the high-end version of iriver is much better than iaudio. P10, P20, and SPINN are better than IAUDIO's I7 and D2. I haven’t heard of S9, so I won’t comment. IAUDIO basically relies on hype. The quality is there, but the tuning is too biased and not suitable for pop, rock, or large-scale classical music.

2. CLIX2 is still available for purchase on Taobao. Let’s compare it with the I7. The quality is slightly worse than the I7, but it is more suitable for popularity, the tuning is more popular, the sound is warm, and it is more durable than the I7. I7 is too cold. I haven’t heard of U3, but it should have the same tuning style as I7. The I7 and D2 I've heard have the same style, and I guess the U3 can't be wrong either.

3. RH1 is still available for purchase. You can go to the headphone forum to buy second-hand, or you can buy it at MD Hut on Taobao. Nowadays HIMD supports direct USB transfer of songs from the computer. Just convert the music format to ATARC, which is SONY's proprietary audio format. RH1 is more suitable for classical music, and NH1 is more suitable for fashion. Which one is better depends on what you listen to. But overall, RH1 is still stronger.

4. High-quality MP3, the recognized standard MP3 is SONY PCM-D50. It can compete with low-end desktop computers and surpass all MP3 players on the market. The disadvantage is that it is ugly and bulky. Jianwu's magic weapon is of course the D9. It costs more than 3,500 yuan now and the sound is very, very good. I think the style can be adapted to a wider range of styles, but classical is still a bit lacking. It can be said that it is not as good as the Innovation ZX and Sony MD RH1. You'd better tell us your budget before making a recommendation. Let’s put it this way, 1500 recommends IPC and JVC V80. The IPC is exceptionally good considering its price/performance ratio, and the sound is okay. The sound is quite listenable. Basically, the sound produced by the headphones is the same style. Less staining. V80 is currently the best flash memory machine that is very popular. There are related reviews on the headphone forum. Of course, SPINN is also good, slightly worse than JVC V80, but it is also in the first lineup of flash memory machines. In addition, JVC V80 is not sold in the Chinese market and can only be purchased overseas on Taobao. These two adaptation styles are relatively broad. The Sony A918 also has a very good sound and is more suitable for rock and pop. The disadvantage is that it is only sold in Japan and not for the Chinese market (Sony keeps all its good stuff for its own use!). If it costs 2500, of course I recommend flying saucer (without A8. Because flying saucer with A8 costs 3500.). Although it cannot be played losslessly, the music taste of the flying saucer is definitely the best! Another disadvantage is that the UFO does not have an LO and cannot be connected to an earphone amp. To be honest, the high frequencies of the UFO are a little dyed, but the dyeing is beautiful. In fact, the combination of flying saucer + A8 is already very good. It should be satisfying for portable enthusiasts. If there is no budget limit, then Jianwu D9. The sound is a little worse than that of a flying saucer, and the noise level is a bit loud. But in actual use, D9 is still more convenient. It has large capacity, longer battery life than a flying saucer, and supports LO.

Three

1. Format theory is not credible. It is impossible to play lossless files necessarily better than MP3. And not everyone can hear the difference between MP3 and lossless. If the 320K MP3 is played back well, it will be like a flying saucer, no worse than the D9 playing lossless WAV. The best format for MP3 is 320. Converting MP3 to lossless does not improve the sound quality and wastes space, which is not worth the loss. The more popular format now, which is better than MP3, is AAC. Generally, 448K AAC is enough. Lossless, today's high-end machines generally support WAV. For downloading lossless resources online, two recommended places are www.zasv.com, which provides APE and FLAC downloads. lib.verycd.com has a lot of stuff, but it’s pretty comprehensive. It’s basically my music library. The speed is a bit slow, so you need to wait patiently to download it

2. (omitted)

3. Support online shopping...

Four

Finally , I recommend you to go to a gathering place for audiophiles: Headphone Forum

www.erji.net

Equipment is secondary. When you reach a certain level, you should devote yourself to music. . After all, what we listen to is not the equipment, but the music.