There is no choice of different digital filters. Handles even power-hungry headphones well, imo up to 300 Ω. …Or runs on its built-in 3700 mAh battery. Plays and charges simultaneously through its two USB-C ports (5V power supply/charger). Drives small loudspeakers through its RCA outputs. Plays two earphones/headphones simultaneously through its two outputs (3.5 mm/6.3 mm). Works as a pre-amplifier or dac when connected to a dedicated headphone amplifier. Can be connected to phone or Windows/Mac computers or Android/iOS sources. DR EARMAN MEME DRIVER
The EarMen TR-amp connects to smartphones vial plug ‘n’ play, it needs a driver for Windows ( download) and none for the Mac. The EarMen TR-amp features the TOTL ES9038Q2M SABRE dac chip and the Texas Instruments TPA6120 headphone amplifier chip. The build is so sturdy that you can probably use it in self-defence – and it will still work thereafter.
Rubber feet on the bottom prevent the metal chassis from being scratched/scratching the underlying surface such as a smartphone. The case is of sturdy aluminum, knob and switch are metal, there is nothing plastic.
rubber ring (for strapping TR-amp to phone). Headphone Amp with Texas Instruments TPA6120 chip: I apologize to EarMen that it took me so long to write this article. This worked so well and the TR-amp so so easy to operate that I had real problems writing an actual review other than telling you that it “works well and is really good”. I have used the EarMen TR-amp for 4-5 months, mainly with the 300 Ω Sennheiser HD 600 headphones. The production is currently in Krusavec, Serbia. The new Chicago warehouse has its focus on the North American market. Earmen is registered in the US, where most of its stakeholders are from. The company is a subdivision of premium manufacturer Auris Audio. The EarMen TR-amp review was previously published at You also find it on the blog's Wall of Excellence: ĮarMen recently appeared big on our radar out of nowhere, with their two models the TR-Amp (“transportable amp”) and the Sparrow dongle. The silver traded on the stock exchange is worth around 17 million US dollars in total.The EarMen TR-Amp is a powerful neutral but not sterile of generic sounding integrated headphone amp (dac/pre-amp) that drives headphones up to 300 Ω) with ease. The most important trading venues for silver are the New York Mercantile Exchange (COMEX), the Tokyo Commodity Exchange, the Chicago Board of Trade and the London Bullion Market. Silver is also produced in China, Poland, Russia, Canada and the USA. The most important producers of silver are Mexico, Peru and Australia. The price of silver has been increasing steadily for several years since the supply of silver cannot meet the high and constant demand. In 2007, 23 per cent of the world’s output of silver was processed as industrial metal in the American industry, 16 per cent in India and Japan, and 7 per cent in Italy. Because silver kills bacteria and other microbes, it is also required in food technology and pharmaceutics. It is worked into items of jewelry or items of everyday use such as cutlery but is also used in electrical engineering and photography. 
The white precious metal is used in many industries. Until the 20th century silver was more important than gold. This is why silver has a particularly high political and economic significance among the precious metals. The Greeks produced the first silver coins and used them as a means of payment. Silver has been used for money since the 6th century B.C. Silver was also referred to by the Egyptians as “lunar metal”. Back then, silver could still be found on the earth’s surface or at shallow depths, meaning that no complex extraction was required. and was already processed by the people living at that time.
Silver has been known since about the 5th millennium B.C. As a result only around 20,000 tonnes of silver are obtained each year. In nature, silver ores are frequently permeated by lead ores. Around 70 per cent of silver production occurs during copper, lead and zinc extraction. In its pure form the white precious metal is even rarer than gold. Silver frequently occurs during the extraction of base metals.
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