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   This winter I was looking for an update on the DAC modules for pocket player Aune M1. And I found information about Aune B1 - the world's first pocket-sized amplifier with adjustable output current level. And he belongs to a class "A"! The unique combination of features! And in the photo I see attractive design in the style of "techno". I managed to buy Aune B1 via the Internet. The amplifier was purchased in Tennmak. Aune B1 has a black beautiful gift box, it has an amplifier, a short cable 3.5mm - 3.5mm, cable micro USB to USB for charging, manual in English and Chinese. B1 components housed in a solid aluminum. B1is available in black and red colors. On the front side, through two windows, one can see the components of the

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   Aune B1 offers three design features that make it unique in the present: Working in the Class A, in the assembly of individual components, adjusting the output level of the electric current. Of course, there is the fourth feature - Financial pleasing my wallet. What gives the enthusiast three design features?

   Class A. Great article about the classes of amplifiers are on Wikipedia.org, here I will write the main points. Pocket amplifiers for devices running on battery power mode amplifier «Class A» has not received wide acceptance because of their low energy efficiency - in theory "works for the sound" headphones 50% of the electrical energy is practically only 20% - 25%! Need a larger battery for optimal operation time. However, signal distortion «Class A» most minimal of all classes! What makes the perception of the pure sound very comfortable for all signal levels, including the lowest levels. This means sound quality is very high. That is why the amplifiers «Class A» are very popular in the most expensive sector of audio - Hi-End. «Class A» - the best choice for those who appreciate natural sound.

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   Individual Components. Because of the simple design, low logistics, rapid manufacturing and unparalleled compactness, operational amplifiers (op-amps) is dominated by the quantity of offerings on the market over the amplifiers composed of other components - transistors, tubes, and others. Individual components need much more space on the PCB and this amplifier will be slightly larger than the amplifier is collected on chip. Transistor amplifiers are more powerful than operational amplifiers Just need to use the components are very similar in their characteristics that require a high level of control selection and greater production costs, otherwise the signal will be defective. Aune B1 contains two separate transistor amplifier unit for each channel - right and left. This means that production quality control should be the highest! Individual components give engineers much greater design freedom, allowing you to change the characteristics of the amplifier the best possible way, but this work requires a high skill and a lot of work. Experienced engineers can make the individual components of what they want.

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   Current Control. (20mA or 40mA) Engineers Aune made a much demanded option - adjust the output level of the electric current. It is very good for the amplifier working with earphones, which require low power, and to work with headphones, which require high power. Earphones on armatured drivers need very low power from the amplifier and very precise control of the diaphragm driver. It's just as well for lack of noise and distortion.

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   Aune B1 works well with headphones, but for pocket amplifier it is very important to work with earphones! My hybrid earphones Topsound Dunu DN-2000 (one dynamic driver, two armatured drivers, 16 Ohm, 102dB) like B1. This amplifier is clearly and precisely controls the dynamic driver, gives expression and liveliness midrange driver, and very importantly, provides super detail with clean "air" damping of high-frequency driver without harshness! Very effective combo! Masterpiece new this year, semi-open Topsound Dunu Titan 1 - titanium dynamic driver 12.9mm, 16 Ohm, 90dB (sic!). This model works well with simple audio sources, like smartphones and cheap players, but all the huge potential of detail and deep bass fast can reveal only a high-class amplifier. 16 Ohm + 90dB is very hard work for the amplifier. And Aune B1 phenomenal precisely controls the driver Titan 1, providing quick energetic detailed sound for all music. Just B1 pleases complete absence of noise. Even with Gain-High, "Current" -40mA using very sensitive armatured earphones! The entire range, from bass to treble, music sounds natural, without coloring.

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   However, the vocals seem warm. Why Are? This psychological perception - sing warm living people, it means that the vocals, the playback source, not color the sound, will naturally warm. Aune B1 has a big stage, the exact alignment of musical instruments and singers. And "air"! Many virtual air, not to resist the virtual sound wave. Therefore, high-quality music sounds easily and naturally! Amplifier neutral and detailed, it does not add to the music nothing takes away nothing. You want to hear the difference between 16bit / 44kHz and 24bit / 96kHz? Yes, B1 can do it. Honest sound. I do not know the exact value of the input impedance of B1, but I think it is very large. Smartphones and players cannot work with this amplifier through the headphone out. Only line out!

   Amplifier warm while charging the battery and using earphones at Gain 15dB, Current 40mA. Amplifier slightly warm during charging the battery at Gain 5dB, Current 20mA and cold as usual. The longest time work - 10:17, shortest - 5:01. Burn in within 96 hours by The Tara Labs Cascade Noise / Burn in disc - the sound became a little clearer, deeper and wider.

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   Aune B1 is the size and weight of a little more than usual; honest neutral sound; perfect silence; ethereal air; deep heavy fast bass; natural warm middle; highly detailed treble; big sound stage; precise positioning of musical instruments and singers. Materials and workmanship are excellent, and the design is unique, beautiful and will please techno geek! Aune B1 - must have for the enthusiast!

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