美国 PS Audio 美诗 DirectStream DAC DSD解码器 全新正品保修
PS Audio推出DSD DAC "DirectStream" 試聽過就會發現,原來以前聽漏那麼多音樂細節!!!
將DSD檔案送進DirectStream,你得到DSD,將PCM檔案送進DirectStream,你也得到DSD。在過去的PCM形式的DAC中,有許多音樂的資訊被遺漏,但是在DirectStream的發揮下,不管是任何格式的檔案,都可以得到比過去更多的細節,更線性,少噪聲的音樂紀錄。
DirectStream的秘訣在於簡單,參考第二張圖,上半部是最好的PCM處理的DAC,非常複雜和迂迴,下半部是DirectStream的路徑,簡潔而明快,過去掩蓋音樂的微妙細節是由於其過於複雜的結構和線路。
DirectStream採用66bit的FIR定點濾波器,並將所以輸入格式提升為10xDSD,使用single-bit double-rate DSS核心引擎,優勢為簡單,線性。不像現有的DAC晶片,有許多妥協和限制,利用FPGA,使訊號處理更密集。
Physical
Unit Weight22 lbs [13.5 kg]
Unit Dimensions14” x 17” x 4” [ 36cm x 43cm x 10cm]
Shipping Weight31 lbs [19 kg]
Shipping Dimensions20.5”x 24” x 10” [52cm x 61cm x 25cm]
Power requirements
Input PowerModel specific 100VAC, 120VAC, or 230VAC 50 or 60Hz
Power Consumption30W
Digtial audio inputs
I2S(2), Coax, XLR Balanced, TOSLINK, USB, Network Bridge slot
Sample Rates
I2S,S/PDIF, and USB -- 44.1kHz to 192kHz 16bit, 24bit, DSD 64, DSD 128
TOSLINK – 44.1kHz to 96kHz 16bit, 24bit
Analog Audio Output
ConnectorRCA/XLR Unbalanced /Balanced (X2)
Output level, low1.41 Vrms(+5BV)/3.15
Output level high, maximum2.81 Vrms (+8dBV)/5.3 Vrms (+12dBV)
Output Impedance100Ω/200Ω
Frequency Response20-20KHz +/- 0.25dB
THD+N @ 1KHz (full scale)<0.03%
Output StagePassive audio transformer, fed by high current, high speed analog amps producing double rate DSD.
Data Handling
FormatPCM or DSD
Sample rate (PCM)44.1kHz, 48.0kHz, 88.2kHz, 96.0kHz, 176.4kHz, 192kHz
Word length (PCM)16b, 18b, 20b, 24b
Data rate (DSD)Standard (2.8MHz) or Double (5.6MHz) DoP on all inputs as well as raw DSD on I2S inputs
Input jitter reductioneffectively 100%, residual immeasurable. No input PLLs, FLLs.
Input Processing170MHz
Signal Processing50MHz
Synchronous Upsampling, all inputs28.224MHz
Digital Processing S/N ration>146 dB
Digital Volume ControlZero loss of precision
Analog Conversion methodDelta Sigma (DSD) Single-bit double rate
I2S Digital Input
ConnectorHDMI
FormatPCM or DSD. DoP on all inputs as well as raw DSD on I2S inputs
USB Digital Input
ConnectorUSB “B” Type
FormatPCM or DoP v1.1 (DSD over PCM)
Transfer modeAsynchronous