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AfterDark. Accretion Portable Digital Transport (PDT) x Raspberry Pi 3 Model B +


AfterDark. Project ClayX Accretion Portable Digital Transport (PDT) x Raspberry Pi 3 Model B +

電磁干擾(EMI)在設計Project ClayX Accretion Portable Digital Transport (PDT)時,以盡量減少對射頻干擾和其他形式的EMI的影響。材料選擇,物理佈局,接地實踐,並且數碼線設計都已被指定,以減少電磁場對本機性能的影響。然而,與此同時,店主的主要目標是在正常的環境中準確地再現錄音室錄製的音樂. 

AfterDark. x 音響夜冷店 2018推出新產品: Project ClayX Accretion Portable Digital Transport (PDT)

店主設計這Portable Digital Transport (PDT)用作DAP, Line out to Portable Headphone AMP, Car Audio, Professional Studio.

店主為什麼推出Project ClayX Accretion Portable Digital Transport?
店主對市場上的DAP設備充滿熱情。店主總是探索最好的Portable Digital Transport數字傳輸,可以滿足他對便攜式音樂DAP的要求。 設計必須在市場上是獨一無二的,所以店主開始研究開發選擇樹莓派設計發燒音響級DAP。 店主開始對UPS電池重新設計,就像發燒音響使用的電源濾波“Power Conditioner”開始. 店主開始研究開發適合與DAP搭配使用的發燒DAC, 電源濾波 Portable Power Conditioner called ”Audiophile Grade UPS Battery Power Conditioner”. 

其實:主要原因是店主想在汽車音響上同在街上使用它...   

特別使用“Duelund金銀合金碳纖維電源線
重要的是Raspberry Pi 3特別使用”Duelund金銀合金碳纖維電源線”, 用Audio Note含銀6%銀錫直接連接搭配使用電源濾波UPS電池, 從穩定的電源中獲益,此外,I2S DAC模塊再次受益於非常好的電源功率濾波器,並消除了乾擾和EMI。結果,使用”Duelund 金銀合金碳纖維電源線” 之後音色華麗無比.。

另外, Accretion Portable Digital Transport 內置獨立I2S DAC**. I2S直入的聲音,非常優秀,明顯好過經USB芯片, 聽古典樂,特別是鋼琴獨奏、交響樂、歌劇, Three Blind Mice, Jazz 用Accretion Portable Digital Transport聽起來卻更為過癮. 

店主提出了一個”Minimist” 概念設計方案,使用另一種方法控制DAP面板,樹莓派DAP產品上是沒有屏幕,所有的控制功能和設置都是通過您的手機/DAP的WiFi熱點設置。店主總是認為設計簡單,控制方便,不需要添加更多沒必要的功能. 也因為這個原因Accretion Portable Audio Player有某種 “Digital Transport” 的味道和聲音概念. 

店主因為習慣了聽audiophileCAS DTD x i2s DAC不能回去聽平常的汽車音響

I2S數字延遲
音樂愛好者甚至能夠經撥碼開關上選擇I2S數字延遲, 直接改變音樂聽感. 使聽感得到了另一種奇秒變化. 
Accretion Portable Digital Transportr的設計也因為耳機是單獨連接,音樂愛好者甚至不需要把他的DAP從口袋中拉出來進行控制。店主認為一個手機控制DAP就夠了. 設計也方便用於汽車音響,商店背景音樂或者您可以利用此功能進行Party Mode派對播放。

**店主為音樂愛好者推出這款產品.”Modulated的DAC主板” 設計非常靈活,因此將來用戶是可選項升級更換DAC主板的。DAC芯片,軟件將來用戶是可選項升級. 

店主為什麼使用Raspberry Pi 3?
店主主要目標是應用Raspberry Pi 3中的Quad Core CPU’s ”Audio Rendering Performance” 音頻渲染性能。使用店主的經驗,提供聲音優化,調諧. 店主量身定做AfterDark特製內核驅動器使DAC芯片I2S信號具有(Advanced Real Time (RT) Kernal)的高級內核驅動器,提高聲音優化。

最後提供良好的發燒電源,使用Silver Plated CFS I2S屏蔽的佈線,使用EMI屏蔽材料以避免3G/4G干擾,以提高樹莓派硬件音樂播放的性能,可以保持實現錄音室錄音 Studio Master/Hi Res Audio高分辨率音頻播放的音頻標準。店主指出AfterDark.’s 對聲音提供優化,調諧的經驗,是一種 ”Synergy” 提出了一個高期望,發燒音響要求的DAP概念產品.

為什麼選擇I2S DAC?
I2S 直入的聲音,非常優秀,明顯好過經USB。最顯著的差異是細節與微動態,直入的聲音,在較小的音量小,仍然能保持相當豐富的細節,更為細膩清晰,直有撥雲見日之感。

聽古典樂,特別是鋼琴獨奏、交響樂、歌劇,用Accretion Portable Digital Transport聽起來卻更為過癮. 音色華麗無比.

I2S(Inter-IC Sound Bus)是飛利浦公司為數字音頻設備之間的音頻數據傳輸而制定的一種總線標準。在飛利浦公司的I2S標準中,既規定了硬件接口規範,也規定了數字音頻數據的格式。
I2S有3個主要信號:

  • 串行時鐘SCLK,也叫位時鐘(BCLK),即對應數字音頻的每一位數據,SCLK都有1個脈衝。SCLK的頻率=2×採樣頻率×採樣位數
  • 幀時鐘LRCK,用於切換左右聲道的數據。LRCK為「1」表示正在傳輸的是左聲道的數據,為「0」則表示正在傳輸的是右聲道的數據。LRCK的頻率等於採樣頻率。
  • 串行數據SDATA,就是用二進制補碼表示的音頻數據
“cpu直出i2s真正火力全開, 初聽感覺像cd轉成sacd, 爛錄音變的更噴飯像是轉檔失敗一樣, 製作棒的果然是歌姬琴神.以前學長說, usb介面聲音輸i2s輸到連車尾燈都看不到, 當時的我竟然把他的話當放屁,現在感受到了, usb dac隔層紗的音質依舊復在” 
“i2s是dac ic與數位音源最直接的橋樑, 有做過功課的鄉親朋友, 都知道i2s是最好的無能出其右, 其他任何傳輸介面都比不上它”


為什麼選擇使用發燒級UPS電池作為主電源?
店主認為建立良好的UPS電源比任何事情都重要。 建立AfterDark audiophileCAS DTD後,我們經驗,通過提供最佳可能的電源,聲音舞台和細節明顯改善。

現在,您可能會看到我們使用的UPS組件,電容器,穩壓器,濾波器都是所有發燒級,並佔用了DAP第二層的大部分空間。同時保持音質的穩定,你會體驗到背景是黑暗和無噪音.

Audio Grade UPS Specification:
  • 4,000mAh 3.7V Li-Ion Battery*
  • Audio Grade Nippon Solid Stage Capacitor 5 x 1000uF
  • TDK ripple inductance
  • Extra USB 5V 2A output for mobile charging
  • Ultra fast charging for demand application
  • PRO Version will come with 4 x 18650 13,600mAh** Battery Storage for Professional User  
重要的是Raspberry Pi 3是”Duelund金銀合金電源線” 直接連接搭配使用電源濾波UPS電池, 從穩定的電源中獲益,這是因為它是音樂呈現作為數字傳輸的中央處理。此外,DAC模塊再次受益於非常好的電源功率濾波器,並消除了乾擾和EMI。結果,每個細節明顯改善。

*最大10-12小時/ **最大38-40小時連續播放基於16位/ 44 kHz,FLAC文件格式,屏幕關閉,75音量播放.

為什麼選擇Industrial SD Card?
普通SD卡和Industrial SD Card 的差別是,普通SD卡三頻不夠開不夠透, 整個羞澀的, 讓音樂很無趣,

當店主上Industrial SD Card+ Runeaudio or Volumio OS系統+5V線性UPS電池+Accretion Evo Portable Audio Player,您可能不會相信那是先前您所聽到的DAP樹莓派,PC/MAC練一百年都追不到那種潔癖高雅的好聲派.

AfterDark. Accretion Portable Digital Transport以精確再現精細聲音。與I2S DAC的完整模型變化,店主除了需要理想的聲音,我們進行了所有的電路和技術的審查。D / A轉換部分,徹底清除準確性和時間軸的抖動,準確地描繪所有的包含在音樂信號中的信息。

店主為什麼選擇TI Burr-Brown PCM5102A?
TI Burr-Brown製造了世界的32位384KHz/32Bit PCM5102A DAC Chip的高級系統。PCM5102是量化噪音極小可聽範圍外,抖動幾乎不受(時間抖動)或數字噪聲,再現精確的空間再現功率和微音的精細程度有優點,即非常高的。 PCM5102A除了PCM5102的特徵,通過改變算法的信息和線性量有了很大的提高。

此外,在基於PCM5102-級產品,因為AfterDark. audiophileCAS DTD系列中,我們使用高品質的連接線。 與AfterDark. Carbon Fiber Shielding (CFS)技術,以襯托出DAC的性能到最大,超過高線性迄今已有,實現了忠實再現的音樂聲源。

在AfterDark. Accretion Portable Digital Transport以精確再現精細聲音。與AfterDark I2S DAC的完整模型變化,店主除了需要理想的聲音,我們進行了所有的電路和技術的審查。D / A轉換部分,讓對音質的影響最大,徹底清除準確性和時間軸的抖動,它準確地描繪所有的包含在音樂信號中的信息。可聽度的高S/ N意識進一步提高,精確再現的空間再現,音樂播放有種細膩+清秀的感覺.

PCM5102A內部PLL時鐘
訊號輸入是I2S,PCM5102A可以不用外部SCK輸入,自己會參照BCK去產生

Raspberry Pi can make use of Integrated High-Performance Audio PLL which can Generate MCK Internally with BCK as reference.

PCM5102A Technical Specification: 
  • Murata's ultra-low ESR chip controllers in parallel for power smoothing capacitor 22 uF x 4 = 88uF.
  • AVX’s high-performance tantalum chip for the power supply capacitors x 3
  • Panasonic's high performance film ECHU Condenser 2.2nF x 2 applied on L/R for the output stage filter condenser,
  • 安裝由KEMET製成的EMI Absorber
  • Supported I2S input sample rates (kHz): 16 / 24 / 32 Bits 44.1KHz,48KHz,88.2KHz,96KHz,176.4KHz,192KHz,352.8KHz,384KHz
  • SNR: 112dB
  • 3u gold plated pin on I2S connector
  • 3.5mm gold plated headphone output
  • Input DC: 4.2 -12V

店主為什麼選擇碳纖維模板?
碳纖維模板是一種含碳量在95%以上的高強度,高模量纖維的新型纖維材料。它是由片狀石墨微晶等有機纖維沿纖維軸向方向堆砌而成,經碳化及石墨化處理而得到的微晶石墨材料。碳纖維外柔內剛,質量比金屬鋁輕,但強度卻高於鋼鐵,並且具有耐腐蝕,高模量的特性,在國防軍工重要材料。它不僅具有碳材料的固有本徵特性,電磁屏蔽性好。

Carbon fiber Technical Specification:
  • Top Layer Dimension: 63.5mm x 40.mm x 2.5mm
  • Button Layer Dimension: 89mm x 55mm x 2.5mm
  • High Precision Carbon Fiber Board with Gloss Mirror Finishing (GMF) Technology
  • Provide EMI-Shielding and Mechanical Anti-Shock Stabilizer (MASS) Platform for audiophile
Accretion Portable Audio Player正面和背面將使用碳纖維模板, 高品質的碳纖維連接線. 為了保持更好的屏蔽,同時保持音質的穩定,你會體驗到背景是黑暗和無噪音。

支持的音頻格式?
  • PCM解碼能力高達32位/ 384kHz,而DoP 64 128 DSD播放也可用。 您可以播放WAV,FLAC,WMA,MP3,OGG,APE(正常,高,快),AAC,ALAC,AIFF,DFF,DSF,DSD ISO
  • Supported audio Formats are well; ‘extensive’ with PCM decoding capable up to 32 bit/384kHz whilst DoP 64 128 DSD Playback is also available. You can play WAV, FLAC, WMA, MP3, OGG, APE (Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF, DSD ISO
Technical Specification: 
  • HI-RES audio support, Using I2S interface; support 16 to 32 audio data format
  • Advanced jitter attenuating PLL
  • 安裝由KEMET製成的EMI Absorber
  • Supported I2S input sample rates (kHz): 44.1KHz,48KHz,88.2KHz,96KHz,176.4KHz,192, 384KHz
  • Supported SoX up-sampling to 32 bit 384KHz (bit to Bit Perfect Playback)
  • Gold plated Audio Grade 3.5mm connector
  • Audio Grade Silver Plated I2S Cables with CFS technology
  • Audio Grade Capacitor on UPS Battery
  • Input DC: 5V
  • Work with Raspberry on Runeaudio, Volumio, Moode Audio, PiCoreplayer
  • The maximum 10-hour continuous play is based on 16-bit/44 kHz, FLAC file format, screen off, 75 of volume playback
聽的感覺:
店主試圖不停地Burn In DAP 一個星期。 這是因為我們認為所有的發燒級配件,電容,I2S,電源線都需要全面Burn In。 最令人驚訝的是電池供電與LPS供電,電池供電有更好的分離,細節是非常好的和平穩的。 聽了幾個小時之後,不會感到束縛. 

Burn In結束後再繼續。

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Why using Audiophile Grade UPS Battery Power Conditioner as main power supply?

The shop owner believed by building a good UPS power supply is more important than anything. We have extensive experience after we build AfterDark audiophileCAS DTD, by provide the best possible power supply, the sound stage and details with improve significantly. Now, you may see all electronic UPS component, capacitors, regulators, filters, we used is all audiophile grade selected and take up most of the space in second layer of DAP. The Raspberry Pi3 can also benefit from the good stable power supply, it is because it is central processing for music rendering as a digital transport. Also the DAC module is again benefit with very good power filter and eliminate the interference, and EMI. As a result, every details and sound will greatly enhanced.


Why using Raspberry Pi 3 to develop DAP?

The main goal is to let people know the audio rendering performance in raspberry Pi 3 is outperformed. The owner is using his experience to apply signature sound tuning for sound optimization, tailor made with software code on advanced kernel driver with I2S signals, DAC chips. Finally with good audiophile power supplied to keep up the audio standard on studio record / Hi Res Audio playback. 

Why AfterDark. design and develop Accretion Evo Portable Digital Transport?
The shop owner himself is passionate about DAP device in the market. He always explore the best possible digital transport which can fulfil his requirement on portable music. The design must be unique in market, therefore, the shop owner started research and development on DAP. 

The shop owner start the re-engineering process on UPS power supply just like a "power conditioner" he used at home, DAC chips selection, software implementation, shielding with CFS cabling, EMI materials to avoid interferences, the hardware performance on music playback. 

The shop owner comes up a solution with minimist design, another approach on DAP concept product in the niche market. We proudly introduce this product for all music lover who require great flexibility, mobility and user can take control on all advanced real kernel level on software. The design is so flexible, so that there is upgrade option on replaceable DAC motherboard in the future.


Audio Test Review:

Let talk about why we have such a product for AfterDark. This product itself is quite innovative, AfterDark. is trying to do something in different approach. The shop owner knows there is a lot of raspberry pi compatible board product to provide DAC solution. However, they are just fine with sample hardware implementation and all in one box design, 

AfterDark. have some innovative approaches for Portable Digital Transport for Raspberry which audiophile can ensure their DAP is in excellent sound performance:
  • Reduce EMI interference by separate I2S DAC away from the raspberry pi. It is because the owner believed that it is always a good idea to separate audio module, power module and avoid EMI from the high frequency of CPU processor.  
  • Try to minimize the jitter by using high quality industry grade internal clock, silver plated I2S cables and optimize all the circuit path as short as possible.
  • Build an external Battery Powered UPS power supplies for I2S DAC, the owner believe the power quality is extreme important to digital signal and sound quality.
  • Try to reduce the interference on I2S DAC with better shielding material on Carbon Fiber Shielding (CFS) cables and 2.5mm thick Carbon Fiber Board at the back of DAP.
  • Try to build an excellent output stage for Hi-Res Audio using industrial quality components.
  • Increase the shock stabilization on I2S DAC.  Special absorber material is applied under the large heavy mass of aluminum metal to ensure audiophile headphone plug have rigid support.
The shop owner trying to non-stop burn in the DAP for a week. It is because, we believed all the audiophile parts, capacitor, I2S, Power Cable needs to full run-in. The most surprise is the battery powered vs LPS powered , battery powered has better separations, and details was extreme fine and smooth. After listening to few hour, you never feel tied, and will continue to listen to other sound smoothly. 

To be continue, after burn in test....


所有發燒產品從設計,生產和裝配及售後服務將會在香港每日夜晚9點開始...人手製作。
因為店主只能在晚上開始生產線,店主每晚只能生產有限的AfterDark.產品。



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