Benchmark DAC1

烧好难 · 发表于 2009-11-30 22:53

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当前PC-HIFI成为时兴，有些论坛对选择Benchmark DAC1做PC-HIFI器材的谈论倒不少，转一些Benchmark DAC1内容。
Benchmark DAC1自2004年推出以来，凭借自身所具有的独特性能优势，逐渐成为工作室录音和家庭音乐市场上的新宠，并在2004年被Stereophile杂志DAC1评选为“2004年年度产品”。受其高保真回放性能的诱惑，越来越多的母带刻录师和录音工程师开始往自己的设备链条上添加DAC1。对此，曾经为Ozzy Osbourne、Metallica以及Janet Jackson等多位著名歌手担任过录音师的Michael Wagener评价说：“DAC1能够让我听到真实的混音。”

具备耳机放大电路,可以直接插耳机使用. 音质纯净中性,高频的透明度和延伸,具备ＵＳＢ接口，可以直接连接电脑使用.
DAC1分为黑色版本和银白色版本. 黑色外观较为"专业",银白色较为时尚美观.

技术参数：
Ultra Lock消除抖晃技术（超越通常两级锁相环技术）
AD1896新一代非同步取样频率转换芯片（超越Crystal CS8420芯片）
AD1853数模转换芯片
2-channel 24bit/192-KHZ audio Digital to Analog Converter

数字输入：BNC x1、S/PDIF x1、光纤x1
模拟输出：RCA x1 平衡x1
输入电压：220V

两组耳机输出插口
耳机和模拟输出音量控制旋钮

Digital Inputs
Number of Digital Inputs (switch selected)	3 (XLR, Coaxial, TOSLINK)
Number of Audio Channels	2
Input Sample Frequency Range	28 to 195 kHz
Maximum Input Word Length	24 bits
Digital Input Impedance on XLR input	110 Ω
Digital Input Impedance on Coaxial input (Jumper Selected)	75 Ω or Hi-Z (Bridging)
Transformer Coupled Digital Inputs	Yes
DC Blocking Capacitors on Digital Inputs	Yes
Transient and Over-Voltage Protection on Digital Inputs	Yes
Minimum Digital Input Level	300 mVpp on XLR, 150 mVpp on Coaxial
Jitter Tolerance (With no Measurable Change in Performance)	>12.75 UI sine, 100 Hz to 10 kHz > 3.5 UI sine at 20 kHz > 1.2 UI sine at 40 kHz > 0.4 UI sine at 80 kHz > 0.29 UI sine at 90 kHz > 0.25 UI sine above 160 kHz
Jitter Attenuation Method	Benchmark UltraLock.


Balanced Analog Outputs
Number of Balanced Analog Outputs	2
Output Connector	Gold-Pin Neutrik™ male XLR
Output Impedance	60 Ω
Output Level Calibration Controls	10-turn trimmers (1 per output)
Calibration Adjustability	2 dB / turn
Output Level Range (at 0 dBFS) In Calibrated Mode	+9 dBu to +29 dBu (Attenuator off) -1 dBu to +19 dBu (Attenuator = 10 dB) -11 dBu to +9 dBu (Attenuator = 20 dB) -21 dBu to -1 dBu (Attenuator = 30 dB)
Output Level Range (at 0 dBFS) In Variable Mode	Off to +29 dBu (Attenuator off) Off to +19 dBu (Attenuator = 10 dB) Off to +9 dBu (Attenuator = 20 dB) Off to -1 dBu (Attenuator = 30 dB)
Output Level Variation with Sample Rate (44.1 kHz vs. 96 kHz)	< +/- 0.006 dB

Unbalanced Analog Outputs
Number of Balanced Analog Outputs	2
Output Connector	RCA
Output Impedance	30 Ω
Output Level Calibration Controls	Shared with Balanced Outputs
Output Level Range (at 0 dBFS) In Calibrated Mode	-6 dBu to +13.5 dBu
Output Level Range (at 0 dBFS) In Variable Mode	Off to +11 dBu
Calibration Adjustability	2 dB / turn
Output Level Variation with Sample Rate (44.1 kHz vs. 96 kHz)	< +/- 0.006 dB
Factory Preset 2vRMS (8.2 dBu)

HPA-2™ Headphone Outputs
Number of Headphone Outputs	2
Output Connector	¼" TRS
Output Impedance	0 Ω
Output Level Control	Stereo Control on Front Panel
Output Level Range (at 0 dBFS) into 60 Ω Load	Off to +21 dBu

Audio Performance
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted)
SNR — A-Weighted, (0 dBFS = +20 to +29 dBu)	116 dB
SNR — Unweighted, (0 dBFS = +20 to +29 dBu)	114 dB
SNR — A-Weighted at low gain, (0 dBFS = +9 to +18 dBu)	114 dB
THD+N, 1 kHz at 0 dBFS	-105 dBFS, -105 dB, 0.00056%
THD+N, 1 kHz at -1 dBFS	-107 dBFS, -106 dB, 0.00050%
THD+N, 1 kHz at -3 dBFS	-110 dBFS, -107 dB, 0.00045%
THD+N, 20 to 20 kHz test tone at .3 dBFS	-110 dBFS, -107 dB, 0.00045%
Frequency Response at Fs=48 kHz	+/- 0.1 dB (20 to 20 kHz) -0.02 dB at 10 Hz -0.20 dB at 20 kHz
Frequency Response at Fs=96 kHz	+/- 0.1 dB (20 to 20 kHz) -0.02 dB at 10 Hz -0.20 dB at 20 kHz -0.85 dB at 40 kHz -2.5 dB at 45 kHz
Crosstalk	-100 dB at 20 kHz -125 dB at 1 kHz -130 dB at 20 Hz
Maximum Amplitude of Jitter Induced Sidebands	< -141 dB (10 kHz 0 dBFS test tone, 12.75 UI sinusoidal jitter at 1 kHz)
Maximum Amplitude of Spurious Tones with 0 dBFS test signal	< -126 dB
Maximum Amplitude of Idle Tones	< -128 dB
Maximum Amplitude of AC line related Hum & Noise	< -126 dB
Interchannel Differential Phase (Stereo Pair)	+/- 0.5 degrees at 20 kHz
Interchannel Differential Phase (Between DAC1 Units)	+/- 0.5 degrees at 20 kHz
Delay (Digital Input to Analog Output)	1.01 ms + (48/Fs) 2.10 ms at 44.1 kHz 2.01 ms at 48 kHz 1.55 ms at 88.2 kHz 1.51 ms at 96 kHz
Maximum Lock Time — after Fs change	100 ms
Soft Mute Ramp Up/Down Time	10 ms
Mute on Receive Error	Yes
Mute on Lock Error	Yes
Mute on Idle Channel	No
50/15 us De-Emphasis Enable	Automatic in Consumer Mode
De-Emphasis Method	Digital IIR
De-Emphasis Supported at	Fs = 32, 44.1, 48, and 96 kHz

Group Delay (Latency)
Delay from digital input to analog output is a function of sample rate	2.72 ms at 28 kHz 2.51 ms at 32 kHz 2.10 ms at 44.1 kHz 2.01 ms at 48 kHz 1.55 ms at 88.2 kHz 1.51 ms at 96 kHz 1.45 ms at 108 kHz The delay can be calculated using the following formula: Delay = 1.01 ms + (48/Fs) Where Fs = the sample rate in Hz.

LED Status Indicators
LED Location	Front Panel
Power (AC power is connected and +5 V supply is operating)	1 (Blue)
Error (Error on the active digital input)	1 (Red)
Non PCM (Non-compatible digital audio format on active input)	1 (Red)

AC Power Requirements
Input Operating Voltage Range — VAC RMS	110 V setting — 90 V min, 140 V max 220 V setting — 175 V min, 285 V max
Frequency	50-60 Hz
Power	8 Watts Idle 8 Watts Typical Program 16 Watts Maximum
Fuses (2 required)	5 x 20 mm
100 V to 130 VAC operation	0.5 Amp 250 V Slo-Blo® Type
200 V to 260 VAC operation	0.25 Amp 250 V Slo-Blo® Type

Dimensions
½ Rack Wide, 1 RU High
Depth behind front panel	8.5" (216 mm)
Overall depth including connectors but without power cord or BNC-to-RCA adapter.	9.33" (237 mm)
Width	9.5" (249 mm)
Height	1.725" (44.5 mm)

Weight
DAC1 only	3.5 lb.
DAC1 with power cord, BNC-to-RCA adapter, and manual	4.5 lb.
Rack mount kit (blank panel, junction block, and rack-mount screws)	0.32 lb.
Shipping weight	7 lb.