A100TB - Headphone Amp - Products

A100TB unlike A100, taking factors such as market change and the optimization of circuits etc. into consideration, A100TB gives up the flexibility in input/output and decides to support 4.4mm balanced input/output only, in order to ensure that the sound is not only clearer, but also comes with power and in 3D. 

There has been fair improvements in the appearance and the manufacturing process of A100TB. Optimized structure and the improvement in the metal processing technologies will bring better user experience to the customers; Well-designed appearance also adds more delicacy and character to the product.

The power supply circuit of A100TB has been upgraded and optimized to a large extent. High current ultra-low noise constant voltage filter circuit is added to the power supply, controlling the ripple voltage at 20uV, and expanding the main filter energy storage capacity to 6800uF, supplying ultimate power to each unit as if it is directly supplied by batteries. Compared to A100, the power supply of A100TB has more powers and is much more pure, which is a qualitative leap.

The amplifier circuit of A100TB is designed as a symmetrical and fully-balanced amplifier circuit that has four channels. The overall circuit architecture maintains the two-stage inverting amplifying structure. First-stage inverting amplifier circuit is responsible for signal gain switching. Gain switches are set internally, with better quality switches and shorter traces to achieve best performance. After first-stage amplification, signals travel to the post-stage inverting power amplifier circuit through the four-channel digital potentiometer, then being output to the headphones. Compared to A100, the circuit of A100TB is less complicated and more refined, only for the purest and most authentic sound.

The overall circuit design of A100TB and its selection of components underwent substantial optimization and upgrading. Vishay precision wafer resistances were used in the audio circuit units. Capacitance undergoes reasonable upgrade based on parameters and sound comparisons. Immersion gold process was added to PCB. The circuit parameters have been tested and optimized repeatedly, leading to the performance enhancement in all aspects.

A100TB continues with the design for quick op-amp replacement, enabling users to “mess with” the op-amps. A100TB can be charged with USB Type-C. The external power supply jack is kept at the back of A100TB to connect AROMA PS100 power supply or PS10 power supply to further amplify the audio.

A100 TRUE BALANCE (下稱 A100TB )，是A100的全面升級版，同時它更為專一極致。在 A100的經驗後，A100TB重點放在保留特點的同時，對內部電路進行一次完全革新，並且選擇了只支持4.4mm平衡輸入和輸出。

跟 A100 有所不同，A100TB 因應市場的變化以及電路等優化的考量，選擇了只支持4.4mm平衡輸入和輸出，捨棄了輸入及輸出的靈活度，讓聲音更乾淨之餘、亦具有力量感、立體度。

A100TB的外觀和製作工藝也有不小的進步。結構的優化，金屬加工工藝的提高，給用戶帶來更好的使用體驗；精心設計的外觀，也使它變得更為精緻與個性。

A100TB的電源部分電路，做了大幅度升級優化。電源增加了大電流超低噪聲穩壓濾波電路，將供電的波紋控制在20uV水平，並將主濾波儲能電容擴大至6800uF，為各單元輸入等同於電池直供的極致的供電。相比A100，它的電源功率更大，純淨度大幅提高，是一個質的飛躍。

A100TB的放大部分電路，設計為四通道對稱全平衡放大電路。電路整體構架依舊保持兩級反相放大結構。前級反相放大電路負責信號增益的切換，增益開關設置在機內，採用更優質的開關和更短的走線以達到最佳性能。前級放大後經過四通道電位器，輸入到後級反相功率放大電路，即輸出給耳機。相比A100，它的電路刪繁就簡，精益求精，只為得到最純淨最真實的聲音。

A100TB的整體電路設計和元件選取，都進行了實質性的優化升級。音頻電路單元中的電阻，全部採用Vishay的精密晶圓電阻。電容也根據參數和聲音比對後進行了合理升級。 PCB增加沉金工藝。電路參數進行了反复的實測和優化調整，使A100TB的各項指標均有不錯的提高。

A100TB 延續了快拆更換運放的設計，讓用家「折騰」更換運放。A100TB 使用 USB Type-C  充電，A100TB 背後繼續保留了外部電源接口，以供連接 AROMA PS100 或 PS10 電源，讓聲音更進一步加強。