Amplifiers & DAC
- Product Details
AK380 Stainless Steel
Stainless steel is a strong, non-corrosive metal that does not easily bend or damage, and can be polished if ever damaged.
Astell&Kern implements a voltage-controlled crystal oscillator (VCXO) high-precision clock with a reference jitter value of 200 femto seconds. A VCXO is a type of crystal oscillation device that creates oscillation frequencies. External environmental stimuli, which in this case means voltage inputs, influence the frequency value. Adjustments to the voltage input tunes a precise frequency value. The jitter that happens in this case is the error that occurs in the reference clock required to perform the samping in digital audio equipment. By utilising a femto clock, the AK380 is able to create a more accurate frequency value and make fine jitter corrections. As a result, the AK380 faithfully reproduces analog sound closer than ever to the original source when transmitting a digital signal as an analog signal.
The circuit design including the digital-analog converter (DAC) are ready for 32-bit processing to handle 32-bit music natively, allowing the AK380 to play up to 32-bit, 384kHz, any 24-bit music files or double layer DSD 5.6MHz natively, without conversion of compression. The AK380 can support up to 9 hours of unbalanced continuous playback and with an internal memory of 256GB and expandable memory up to 128GB, never run out of songs to listen on the AK380.
A parametric equalizer (PEQ) was implemented into the AK380 to deliver detailed adjustment of the original sound, and an audio digital signal processor (DSP) was added to aid in the process. The frees up CPU cycles previously needed for calculating graphic equalizers (GEQ), allowing more detailed and accurate calculations via the dedicated DSP. The audio DSP expands the existing 10-band, ±0.5dB GEQ to 20-band, ±0.01dB to more precisely adjust the frequency and gain (dB) as well as more accurately specifying the frequency range via bandwidth value adjustments.
The AK380 supports USB DAC functionality. When connected to a PC or Mac via the USB, the AK380 transforms into a DAC that supports PCM/DSD, delivering richer audio of outstanding soundstage and resolution well beyond the limits of a built-in sound card.
The AK380 AMP supports 8.1 Vrms output when connected via high-gain balanced output. High-gain output is four times greater than low-gain output and supports high-impedance headphones. An amplifier, which increases audio output, consumes a great amount of energy. Thus, the AK380 AMP features a 3400 mAh large-capacity battery - identical to the AK380 itself - to support up to nine hours of continuous unbalanced-output playback.
The AK380 AMP was designed as an extension of the light and shadow theme of the AK380. The amp retains the subtle changes and details in the emitted brilliance as light flows across its surface. The diamond pattern engraved into the volume wheel of AK380 is repeated on the amplifier's rear light for design continuity. The area of the amplifier in contact with the AK380's volume wheel reproduces the design's angle of reflection for comfortable wheel operation. The amplifier's light shining delicately through the gaps in the reflected surface visually accentuate the music's mystique.
To protect earphones/headphones during high output, the volume is automatically adjusted when the amp is powered on or the earphones/headphones are disconnected. Furthermore, the gain can be easily adjusted via the AK380's settings.
AK380 Stainless Steel
Digital Audio Converter (DAC) AKM AK4490 x2 Memory Internal: 256GB
External: microSD (up to 128GB) x1
Battery 3400mAh 3.7V Li-Polymer Battery
Up to 9 hours of unbalanced playback
Supported Formats WAV, FLAC, WMA, MP3, OGG, APE (Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF Sample Rate PCM: 8kHz ~ 384kHz (8/16/24/32bits per sample)
DSD Native: DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz), Stereo / DSD256 (1bit 11.2MHz), Stereo
I/O Ports Input: USB micro-B input (for charging & data transfer)
Output: PHONES (3.5mm) / Optical Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Frequency Response ±0.053dB (Condition: 20Hz ~ 20kHz) Unbalance & Balance
±0.56dB (Condition: 10Hz ~ 70kHz) Unbalance
±0.55dB (Condition: 10Hz ~ 70kHz) Balance
Output Impedance Balance: 1ohm
Signal-to-Noise Ratio (SNR) 116dB @ 1kHz, Unbalance
117dB @ 1kHz, Balance
AK380 Stainless Steel Amp
Frequency Response [Low Gain] ±0.06dB (Condition: 20Hz ~ 20kHz) Unbalanced / Balanced
[High Gain] ±0.03dB (Condition: 20Hz ~ 20kHz) Unbalanced / Balanced
Output Level [Low Gain] Unbalanced 2.1 Vrms / Balanced 2.1 Vrms (Condition: No Load)
[High Gain] Unbalanced 4.1 Vrms / Balanced 8.1 Vrms (Condition: No Load)
Signal-to-Noise Ratio [Low Gain] 110dB @ 1kHz, Unbalanced / 110dB @ 1kHz, Balanced
[High Gain] 113dB @ 1 kHz, Unbalanced / 114dB @ 1kHz, Balanced
Battery Capacity 3400mAh large-capacity battery Battery Life Up to 9 hours continuous unbalanced-output playback I/O Ports Input: Type-B micro-USB (for charging and data transfer)
Output: PHONES(3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Dimensions (W x H x D) 80.7 x 128.4 x 10.3 mm Weight 165g
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