產品：nuForce uDAC-2
版本：Version 2
先前在想，有一個外接耳擴+加上耳機連接電腦
如果換過電腦後這台耳擴依然可以延續使用
省錢省麻煩
所以這時老闆推薦這台
主要是因為由音效卡推到擴大機後出來的聲音就是有音噪，所以需要用的耳機的我特別會注意到耳噪問題，而且這台只要連接XP以上的系統就系統會自動抓取，不用在額外驅動程式安裝，聽說晶片也是他們自行研發與外面常用的晶片不同
Nuforce 的 uDAC-2 是 同廠型號 uDAC 的升級版。經USB線連接電腦，即可把電腦的數碼輸出轉換成一般CD機模擬音頻輸出(RCA接口、2 volt)；配合家中立體聲糸統，書桌糸統或耳機，即可享用電腦聽歌的無比便利與樂趣。音效表現一點也不俗，可比美甚至超越眾多 Hi-Fi 級 CD唱機。此外，還備有同軸(co-axial)數碼輸出接口，方便一些發燒用家連接家中的Hi-Fi級CD解碼使用。小巧精密，用途廣泛，音效出色，絕對可滿足不同高要求用家的需要。
uDAC-2靚聲的祕技，除了採用了Nuforce 高速Turbo加壓充電及濾波線路，還採用了著名BB公司最新的24bit/96KHz解碼芯片。內置耳機放大部份也改良了。此外，還用上了比uDAC優勝的高線性TOCOS音量控制，大幅提高了弱音部份的左右聲道分隔能力。
產品特性：
- · 獨立USB數碼接收器及獨立DAC碼解
- · 同軸S/PDIF數碼輸出(關掉音量控制即可啟動)
- · 雙重jitter(時差)斗正糸統，其一設於數據接收，另一設於升頻處理部份
- · 高電平 (2V),模擬訊號輸出
- · 高線性TOCOS音量控制線路，有效改善弱音部份的左右聲道分隔能力
- · 音頻部份線路中，絕無電容交連
- · 低電秏；只用上USB內置微弱供電
- · USB供電，無需額外供電變壓器
- · 可配合阻抗為16-300 Ohm 的耳機使用
輸入規格：
- · USB
- · 兼容，USB原生碼率：32-48kHz, 16bit, 及 96kHz, 24-bit
- · 最大取樣率：96kHz
- · 解析度：24-bits
輸出規格：
- · 類比RCA輸出=2Vrms
- · 動態範圍：110dB
- · 總諧波失真= -95 dB
- · 訊噪率>98dB
- · 數碼輸出：同軸RCA 75-ohm
- ·
耳機輸出端子:
- · 輸出功率：80mW x 2 @16 Ohm
- · 耳機阻抗：16-300 ohm
電力：USB供電
體積：68x38x21mm
網址： www.nuforce.com
A must-have laptop companion! Discover digital music's true headphone
potential
NuForce uDAC-2 is a high-performance 24bit/96kHz USB Digital Audio Converter (DAC) that connects your personal computer's audio to your home stereo, desktop sound system, or headphones. The quality and versatility of the uDAC-2's performance belie its diminutive size. With its extensive power supply, filtering capabilities and charge-pump circuit as a foundation, the uDAC-2 processes incoming data via a USB audio receiver. A D/A converter chip then translates the data to a two-volt analog signal. The NuForce uDAC-2's performance equals or exceeds that of a great many audiophile CD players. The unit's exemplary flexibility -- analog RCA, digital coaxial, and high-performance headphone outputs -- is bound to satisfy the needs of the most critical music lover.
As a step above the uDAC, the uDAC-2 boasts a highly linear TOCOS volume control for improved channel tracking at low listening levels in addition to 24bit/96kHz USB DAC and an improved headphone amp.
* iPAD with iOS 4.2.1 works with uDAC-2 provided that a powered USB hub is used between an iPAD and the uDAC-2.
* If you're using the Icon uDAC-2 with sensitive in-ear earphones and listening at low volume, please read this article about channel imbalance issues.
Note1. The uDAC-2 is designed for consumer playback of digital music. It has not been calibrated for professional recording. At the 9 o'clock volume indicator, there is hardly any signal; further, analog pots do not behave reliably. At normal listening levels, the volume tracking is within 1dB.
Note2. The uDAC-2 volume max out at around 0dB input (maximum digital input) with THD+N around 1% is intentional, i.e., targeting the voltage rail limit in order to achieve the loudest possible, yet un-distorted, music playback. Short of 1% THD at 0dB input, we are not fully implementing our voltage limit, which translates in practical terms to a diminished volume range for music.
Specifications
Input
- USB (USB 1.1, 2.0 compatible)
- USB DAC: USB 1.1, 2.0 compatible. USB native bit rate: 32, 44.1, 48, and 96 kHz, 24-bit
- Maximum sampling rate: 96kHz
- Resolution: 24-bits
Output
- Analog RCA Output = 2Vrms
- Dynamic Range: 90dB
- S/N Ratio: 98dB
- THD+N 0.05%
- Digital Output: coaxial RCA 75-ohm
- Headphone output jack
- Power output: 80mW x 2 @ 16-Ohm
- Headphone impedance 16-300 Ohm
Frequency Response
- 20-20kHz
Power
- USB Bus Powered, 80 mA/5V
- Maximum power consumption: 500mW
Dimensions
- 68x38x21mm
夠薄吧！
結論：
優點：
1. 耳擴可以直接接到PC USB不用拆殼安裝
2. 不用安裝驅動程式即差即用
3. 體積小
4. 用耳罩時沒有聽到音噪
5. 不用外接電源
6. 可以再外接到擴大機
如果沒有音噪問題小猴子拔拔我還是會選擇利用擴大機方式輸出，但是還是需要搭配厲害的音效卡，所花費的成本考可能就會提高，因此還是放棄
以一般使用這是經濟永久性也可以攜帶的產品
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