日本Furutech集團的品牌ADL – Alpha Design Labs，以小巧、隨身型的High End音響產品為主要產品線，持續推出讓人眼睛一亮的產品，當初ADL GT40發表時，就被業界形容為「音響產品中瑞士刀」，小小的身驅幾乎無所不能，而最新發表的ADL STRATOS無論是在功能上、表現上又有突飛猛進的進步。
ADL STRATOS不僅是一台DAC、還是一台前級、一台唱放及一台耳擴，STRATOS解碼能力高達DSD 11.2M及PCM 32Bit/384kHz，此外還有ADC類比轉數位功能，轉換能力最高可達24Bit/192kHz，用家可以很容易的將音樂轉成高解析檔案存在電腦當中，例如黑膠唱片，可透過STRATOS內建高品質的MM/MC唱放及ADC，轉成數位檔案後，隨時使用STRATOS播放聆聽，黑膠迷再也不用怕黑膠唱片磨損，而且還能享受到Furutech充滿細節、乾淨與具有音樂性的重播。
STRATOS強大的耳擴可以驅動市面上所有的耳機，無論是最新一代的High End耳機或是古典迷人的靜電耳機，ADL STRATOS都能榨出唱片裡的所有細節，這是因為ADL使用的都是最好的元件與日本設計追求完美的原則。
STRATOS雖然體機嬌小，但裡面擁有許多讓人驚奇的科技，擁有豐富的介面，其包括一組RCA類比輸入，一組Line-in可切換成唱放MM或MC放大；USB、S/PDIF同軸與光纖數位輸入、USB與光纖數位輸出，類比輸出部份則有RCA與XLR各一組，並且都使用了Furutech最好的端子以追求最好的聲音品質。STRATOS每一個地方的設計都經過再三的深思熟慮，使用最新的科技與設計才完成， STRATOS還附有遙控器，在使用上更為便利。
ADL STRATOS採用了包括XMOS U8高速USB晶片(480Mbps)，ES9018K2M SABRE32 DAC解碼晶片(DSD 11.2M, PCM 32Bit/384kHz)、CS5340高品質ADC類比轉數位晶片、三顆強大的TPA6120A2 (12~600 ohm)耳擴放大晶片及MUSES72320高品質電子音控，STRATOS可同時支援ASIO與非同步(Asynchronous)模式。
STRATOS USB DAC 規格
‧USB播放最高可支援到PCM 24~32bit/384kHz
‧USB錄音規格最高可到PCM 24bit/192kHz
‧頻率響應: 20Hz ~20KHz (+/-0.5dB)
‧訊噪比: SN ratio: >96dB (A- WTD) / Line Output: MC Output >60dB(A-WTD), MM Output >70dB(A-WTD)
‧類比輸出電平: 5.0 Vrms
‧類比輸入電平: 2 Vrms
‧S/PDIF輸出解碼: 24bit/192KHz (Max.)
‧MC/MM輸入電平: MC: 0.4mV / MM : 4.0mV
‧MC輸入容抗: 1000 PF, MM輸入容抗: 100 PF
‧輸入阻抗: MC :100 ohm / MM :47K ohm / Line : 47K ohm
‧耳擴平衡輸出電平: (XLR 4-pin): 1% THD 1kHz (Max.)
400mW(12 ohm),800mW(16 ohm),1200mW(32 ohm), 2200mW (56 ohm), 700mW (300 ohm), 350mW (600 ohm)
‧耳擴非平衡輸出電平: (6.3mm Stereo phone jack): 1% THD 1kHz (Max.)
1100mW(12 ohm),1400mW(16 ohm),1000mW(32 ohm), 820mW (56 ohm), 190mW (300 ohm), 100mW (600 ohm)
‧電源AC變壓器: Erp step2 compliant, 2Wire AC Input Type, Class II, AC/DC Switching Adaptor output DC 15V / 0.8A / 12W
‧尺寸: 215 (W) x 180 (D) x 64 (H) mm
‧重量: 1330g Approx.
官方所提供的ADL STRATOS資訊：
‧XMOS Integrated High Speed USB 2.0 PHY giving 480Mbps data-rates and USB Audio Class 2. PCM 24~32bit/384kHz (Max.) sampling rates supported. (* Note-32bit will not be shown on computer) USB 2.0 high-speed compliance with DSD (2.8M,5.6M and 11.2M data supported), with the ability to sample 44.1, 48, 88.2, 96, 176.4, 192, 352.8 and 384 kHz sampling rates, indicated by LEDs on the front panel
‧ ESS ES9018K2M SABRE32 Reference Stereo DAC : Audiophile-grade (DSD /2.8M, 5.6M, 11.2M supports) 32bit 384kHz DAC Chip. The SABRE-2M DAC is an audiophile-grade high-performance 384kHz, 2-channel audio D/A converter designed for audio pre-amplifiers and A/V receivers, as well as professional applications such as recording systems, mixer consoles and digital audio workstations. With ESS patented 384kHz Hyperstream™ DAC architecture and Time Domain Jitter Eliminator, the SABRE32 Reference Stereo DAC delivers an unprecedented DNR of up to 135dB and THD+N of -120dB, the industry’s highest performance level that will satisfy the most demanding audio enthusiasts.
‧Analog-to-Digital Converter: The STRATOS sports a high-performance CS5340 ADC chip for high resolution recordings via analog inputs including phono, AM/FM radio, or other analog signals to PC or MAC hard drive (24bit/192kHz Max.)
‧Ultimate high-end grade linear volume control: 2-channel electronic volume allowing the volume to be preset for each input (Phono, Line, USB): The MUSES72320 is a ±18V operation 2-channel electronic volume, which is optimized for high-end audio and professional audio applications with advanced circuitry and layout. The MUSES72320 performs low noise and low distortion characteristics and with resistance ladder circuit.
‧Three Powerful Headphone Amplifiers: STRATOS has three powerful TI TPA6120A2 headphone amplifiers: a pair handle the left and right channels of the XLR (4-pin) balanced output (non-switched), and the third powers the 6.3mm Stereo phone jack output (switched). (TI TPA6120A2 driving from 12 to 600 ohms at >120dB dynamic range)
‧ASIO (Windows); Plug’n Play (MAC)
‧ Line , ADC and DAC OPA : TI NE 5532 OP Amp, PHONO OPA : JRC NJM2068DD OP Amp
‧ S/PDIF Coaxial and Optical input: If the playback sample rate cannot not be set at source, the Coaxial and Optical LED will indicate (Max. 24bit/192kHz sampling rates supported)
‧ Optical S/PDIF output (for USB, Optical and Coaxial) 24bit/192kHz Max.
‧Convenient Clip signal Toggle switch for Recording Attenuation: Adjust the recording attenuation to avoid any distortion during recording: -6dB, 0dB or +6dB (Rec/db signal light comes on when input level exceeds circuit Gain).
‧ Phono Preamplifier: The STRATOS features a phono equalizer for recording your precious LPs. Switch between Moving Magnet (MM) and Moving Coil (MC) or Line input
‧Dual External power supply :
Power supply-1: 5V DC from USB bus powered USB chip only.
Power supply-2: External AC/DC Switching Adaptor output DC 15V / 800mA / 12W provides power needed for high resolution audio via LINE, PHONO, COAXIAL, OPTICAL inputs (The STRATOS also excels as a standalone DAC digital amplifier when not playing computer based files via USB).
‧Highest Quality Parts: The STRATOS features a high quality amplifier and condenser supporting its high performance analog circuit
‧High End Audio Grade Connections: The STRATOS is equipped with gold-plated Teflon-insulated FURUTECH FP-900 RCA jacks and High End Performance FT-783M XLR Sockets with an extremely high quality aluminum chassis and machined volume knob
