We at Astell&Kern have been relentlessly searching for just the right raw material to complement sound.
Stainless steel has given us unwavering strength
Duralumin, a material used in aircraft, has given us high rigidity and light weight
Aluminum has given us excellent wear resistance
We selected copper as the principal raw material for the newest variant of the AK380 to convey the message
that this is more than just
a medium for transmitting music - it's an ”instrument”.
Witness the birth of a new instrument - The AK380 Copper
32-bit 384kHz
bit-to-bit Play
Native DSD
Parametric EQ
200fs VCXO
Reference Clock
AK Connect
Metal Touch Sensor
Home button
Metal Body
(Duralumin)
External AMP
All of the AK380 Cooper’s circuit design including the digital-analog converter (DAC) are ready for
32-bit processing to handle 32-bit music natively.
Other products have traditionally used sample rate converter (SRC) method down sampling for
playback.
However, the AK380 Cooper is capable of playing back 32-bit, 384 kHz original sound without any down
sampling.
The result is the AK380 Cooper plays up to 32-bit, 384 kHz, any 24-bit music files, or double layer DSD
11.2MHz natively, without conversion or compression.
32-bit bit-to-bit Playback by the AK380 Copper
32-bit Playback by Other Products
A parametric equalizer (PEQ*1) was implemented in the AK380 Cooper to deliver detailed adjustment of
the original sound, and an audio digital signal processor (DSP) was added to aid in this
process.
This frees up CPU cycles previously needed forcalculating graphic equalizers (GEQ), allowing
more detailed and accurate calculations via the dedicated DSP.
The audio DSP expands the existing 10-band, ±0.5 dB graphic equalizer (GEQ*2) to 20-band, ±0.01
dB to more precisely adjust the frequency and gain (dB) as well as more accurately specifying
the frequency range via Q value adjustments.
* The PEQ supports up to 8 kHz - 192 kHz (8/16/24-bit) formats, but DSD and 32-bit audio are not supported.
AK380 Copper 20-band PEQ and AK240 10-band GEQ Frequency Values
Parametric equalization refers to the ability to increase or decrease the volume within the Q
value range.
A Q value is a frequency range relative to a selected frequency. The frequency range decreases
when the Q value increases and vice versa.
Graphic equalization divides the audible frequency register into several registers and increases
or decreases the level of each register with a volume slider to adjust the respective
frequency’s characteristics.
The switches of the volume slider are connected like a graph to visually determine the frequency
characteristics, hence the name "graphic equalizer."
Astell&Kern implemented a voltage-controlled crystal oscillator (VCXO) high-precision clock with a reference jitter value of 200 femto seconds*3. Femto clocks are commonly used in high-end audio systems, and the clock is measured in high-precision femtosecond units(one quadrillionth of a second).
A VCXO, or a voltage-controlled crystal oscillator, is a type of crystal oscillation device
that creates oscillation frequencies.
External environmental stimuli, which in this case mean voltage inputs, influence the
frequency value. Adjustments to the voltage input tunes a precise frequency value.
Jitter refers to the undesired deviation in time that occurs in a periodic signal. In this
case,
jitter is the error that occurs in the reference clock required to perform the sampling in
digital audio equipment.
By utilizing 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 AK Connect and AK Connect HD apps are available for download from the Google Play Store and the Apple App Store.
Google Play Store Apple App Store
[Phone] AK Connect
[Tablet] AK Connect HD
The AK380 Copper is the first Astell&Kern product to utilize a metal capacitive touch interface. The pressure-sensitive Metal Touch home button responds to fine pressure changes so users operate the device with just a light touch on the metallic pad.
The AK380 offers great expandable options through its micro USB connection and balanced out
ports on the bottom of the unit.
The AK380 Copper’s functionality is expandable by connecting to a variety of devices.
You can increase the output and connect to a greater variety of high-impedance professional
headphones through the upcoming AK380 Amp SS. The AK380 Cradle features balanced output in addition to USB
data transfer and
charging capabilities, and the AK380 Copper CD-ROM drive rips audio CDs directly to the AK380 Copper.
A New Approach to Music
AK380 AMP Copper
The AK380 Copper's Bedrock
Cradle
Perfect Extractor
CD-RIPPER
When Music Becomes More Than Just Sound
Copper, as an alloy with tin, nickel, or zinc, is used as a raw material for wind instruments,
which form the central part of an orchestra. These wind instruments transmit deep and heavy
sounds through tubes of copper alloys.
In addition, copper is the second most electrically conductive1 metal after silver. With
superior electrical conductivity and shielding performance than typical metals, the AK380 Copper
is able to deliver a different sound signature than the existing duralumin-based AK380.
* The copper used in the AK380 Copper boasts a 99.9% pure elemental property.
