我現在正在用著Benchmark內建的耳擴聽著T1
該怎麼形容現在的聲音呢？
整體偏大港走向，中頻有點ne5532獨特的甜味
中高頻有讓人愉快的微微硬質感
很讓人意外
當然並不是一帆風順，剛接上去時，耳擴和耳機這兩端像是在打架一樣，
低頻失去控制，轟頭
讓它亂個半天之後，低頻控制住了，卻變得呆滯無比
音色灰灰濛濛的，了無生趣
查覺不對勁，乾脆拔下耳機，讓耳擴和耳機雙方都休息一下，喘口氣
剛剛又重新接上，發出了意想不到的好聲音
run-in應該不是問題，我的T1早就已經run開了，而DAC1更是一年到頭都不關機，難不成器材之間也需要磨合？
從主力配備的觀點來看，DAC1耳機孔的聲音質感明顯較粗，高頻延伸也不是那麼讓人滿意，也還不能強求明確的空間感與立體的結像
但是對欣賞音樂而言，我想也足夠了
對懂電路的人而言，DAC1的內建耳擴線路大概是最陽春的那種
NE5532推buf634，比較有趣的是用速度慢的OP去推速度快的buf這個思路
可能有人以為會選用NE5532這種OP只是cost down的原因，然而Benchmark的工程師是這麼描述NE5532的
Don't underestimate the NE5532. We have just completed a very comprehensive set of tests on the NE5532 and on various substitutes. We have not found anything that will equal the tranparency provided by the NE5532.
Some have suggested susbstituting OPA2134 op amps in place of the 5532s. This is a bad idea! Our tests show an increase in both 2nd and 3rd harmonic distortion, and the addition of higher order (4th, 5th, 6th, and 7th) harmonics that are virtually absent from a stock DAC1. In addition, IMD will increase, and SNR will degrade.
The NE5532 is power hungry, it has high input bias currents, and high offset voltage, but it can drive high-level low impedance circuits with ease. The 5532 should not be used with low signal levels, and it should only be used in low gain circuits. Also, the offset voltage must be managed with appropriate design techniques. I believe the NE5532 has aquired a bad reputation because it has often been missapplied. The DAC1 is carefully designed specifically for the NE5532 op amp. It may surprise you that the NE5532 was selected for transparency and not on the basis of cost.
懶得翻了，以後見之明的立場來看，看起來倒是頗有那麼一回事
如果要說最明顯的缺點，我覺得預設增益搭配T1而言太大了一些
