我们都知道AAC是一种相当不错的音乐格式,虽然拥有多种标准,但在同码率下对比MP3的音质占有明显优势,而128kbps与256kbps的AAC差别,您能听出来么?Maximum PC就做了一次双向盲测试验,让十个普通人用同样的设备(30GB iPod+普通iPod earbuds,20美金,和昂贵的舒尔的入耳式SE420耳塞,400美金)收听来自iTunes站点的同一首音乐,但是两首的编码率不一样,分别为之前的DRM 128kbps AAC和刚刚推出的iTunes Plus 256kbps,看看差了一半编码率的AAC是否能够被区别出来,一方面测试价格相差悬殊的耳机能否对正常听音有明显差别.事实证明,
1.仅仅在音乐文件方面,256kbps的AAC情况要远远好于128kbps,在使用广为诟病的iPod原装耳机时(绝大多数iPod玩家选择更换耳塞),选择高比特率的占了80%,
2.让人大跌眼镜的是而同样使用昂贵的舒尔耳机时,这一比例竟然下降到了60%.
400美金的准确率竟然不如20美金的苹果原装耳机,这能说明什么呢?
所以,此次测试给我们两个答案,高的编码率能提高基本的音质,而好的耳塞能将本身较差的音乐"美化",变得好坏难辨.
| Listening Results | ||||
| ARTIST | ALBUM | TRACK | PICKED HIGH BIT RATE W/APPLES? | PICKED HIGH BIT RATE W/SHURES? |
| Nine Inch Nails | Year Zero | The Great Destroyer | Yes | No |
| Tea Leaf Green | Taught to be Proud | If it Wasn't for the Money | No | No |
| Guns & Roses | Use Your Illusion II | Civil War | Yes | Yes |
| Husker Du | New Day Rising | Celebrated Summer | Yes | No |
| Massive Attack | 100th Window | Future Proof | Yes | No |
| Stevie Wonder | Original Musiquarium I Vol. II | Sir Duke | No | Yes |
| Mingus Big Band | Gunslinging Birds | Jump Monk | Yes | Yes |
| Sunday's Best | Where Are You Now? | Truest You | Yes | Yes |
| Andres Segovia | Legendary Andres Segovia in an All-Bach Program | Chaconne (from Violin Partita No. 2) | Yes | Yes |
| Steely Dan | Aja | Josie | Yes | Yes |
http://www.maximumpc.com/article/itunes_256_vs_128_bit?page=0%2C2