FIIO K7 FIIO small stationary headphone amplifier with USB DAC dual configuration [] built-in THX-AAA 788+

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Equipped with Asahi Kasei Microdevices' latest DAC chip "AK4493SEQ" in a dual configuration: The K7 is equipped with the latest DAC chip "AK4493SEQ" by Asahi Kasei Microdevices (AKM), which has redesigned the previous model "AK4493EQ" with current high-quality sound technology, in a dual configuration with one chip each for the left and right channels. The AK4493SEQ, designed based on advanced VELVET SOUND technology, pursues a rich amount of information, a sense of sound speed, and realistic spatial expression while effectively suppressing power consumption by optimizing impedance. In addition, by reviewing the noise design, we have greatly improved the auditory sense of noise compared to the catalog specifications. It achieves excellent analog characteristics with a maximum S/N ratio of 128dB and THD+N of -115dB. Adopts a fully balanced design from the DAC to the headphone amplifier section: The K7's audio circuit is designed based on the same architecture as the top model K9 Pro ESS, and is a fully balanced circuit consisting of 6 blocks: DAC, low-pass filter, volume control, buffer amplifier, preamp, and headphone amplifier. By thoroughly inputting differential signals to each block divided into left and right channels, mutual interference that adversely affects sound quality is eliminated to the utmost, enabling high-dimensional music playback that is more faithful to the signal. Equipped with two ``THX-AAA 788+'' headphone amplifier circuits jointly developed by FiiO and THX: The K7 is equipped with the same ``THX-AAA 788+'' amplifier circuit as FiiO's top-of-the-line stationary headphone amplifier model, the K9 Pro ESS. This circuit is an amplifier circuit jointly developed by FiiO and THX based on the ``THX-AAA 788'' circuit to provide ideal detail and dynamics for all headphone playback, from high efficiency to low efficiency. The K7 has a fully balanced configuration and is equipped with two units, one for each left and right channel, achieving high output of up to 2000mW when loaded with 32Ω and up to 560mW when loaded with 300Ω. Adopts XMOS's "XUF208" and supports PCM 384kHz/32bit and DSD256 playback: The K7 uses XMOS's "XUF208" as the USB decoding chip. Equipped with this chip, it has decoding capabilities of up to 384kHz/32bit for PCM and up to DSD256 (Native) and DSD128 (DoP) for DSD, and performs high-quality D/A conversion by always selecting the optimal clock for the input source using dual clock management technology. Adopts a clean independent power supply circuit design: The K7 uses a power supply circuit design that supplies independent power to each block of the circuit to suppress power supply noise that negatively affects sound quality. The power supplied from the external 12V switching power supply is kept clean by low-noise LDOs in charge of each block, adjusted to the appropriate amount, and then delivered to the components. ADC volume control function that enables fine volume adjustment: K7 uses ADC volume control function for volume adjustment. Unlike the analog volume method, which directly operates the variable resistor through which the music signal is applied, this method adjusts the volume by controlling the volume IC based on the AD-converted value of the amount of rotational change of the volume knob. While eliminating left and right volume differences and noise, which are problems with analog volume, it is now possible to finely adjust the volume in 112 levels. Equipped with a 2-step hardware gain adjustment function: The K7's hardware gain can be adjusted from 2 steps: High and Low by operating the GAIN switch on the front of the main unit. By adjusting the gain according to the efficiency of the connected headphones, you can always enjoy music at a comfortable volume level. Equipped with a variety of inputs and outputs, it can be used as the center of your audio system: The K7 supports digital input using a USB terminal, RCA coaxial terminal, and square optical terminal, analog input and output using an RCA terminal, single-ended output using a 6.35 mm headphone terminal, and balanced output using a 4.4 mm terminal. Not only can it be connected to a PC, but it can also be connected to various digital devices to enjoy music with high-quality balanced connections, and can be easily integrated into the audio system you already own. Switch each input by operating the INPUT button on the front. When you press the button, the indicator lights up colorfully to show that the input has been switched. You can switch between three output modes by operating the OUTPUT switch. In addition to enjoying music with headphones, you can select the appropriate output mode when connecting to active speakers or connecting to an external amplifier as a pure DAC. Equipped with an RGB indicator light that combines functionality and design: The K7's RGB indicator light has evolved further from the K5 Pro ESS, making it possible to display not only a single color but also a mixture of multiple colors. The K7's unique and bright colors shine as it turns on/off and switches inputs, making it a visually eye-catching presence on your desk. Refined and simple housing design: The K7 housing is carefully assembled using CNC-machined parts made of highly rigid aluminum alloy. The height is 55mm and the width is less than 1/3 of A4 size, making it compact and easy to install on your desk. In addition, the simple and modern design blends naturally into your interior. Although the K7 is a compact stationary USB DAC/headphone amplifier of the same size as the K5 Pro ESS, it is equipped with AKM's latest DAC chip "AK4493SEQ" in a dual configuration, one operating in each left and right channel, and the audio circuit uses the same fully balanced design as the top model K9 Pro ESS. This is the latest model that supports balanced headphone connections, which has been requested by many users. By adopting the same ``THX-AAA 788+'' technology as the K9 Pro ESS in the headphone amplifier circuit, it accurately depicts the details of the music contained in the signal without compromising it, while delivering an astonishing drive power of up to 2000mW from a compact housing.