- Product Details
The AK70 supports the 2.5mm 4-pole balanced output (2.3Vrms) that has been in use since the second generation of the Astell&Kern players. Unlike the unbalanced type, the balanced output type is capable of removing noise (common mode noise) that can occur in "signal + inverting amplifier signal" and has the strength of increasing output due to its double transmitting signals. The AK70 can also support the 3.5mm 3-pole unbalanced outputs (2.3Vrms), with compatibility with a variety of Hi-Fi earphones and headphones.
Supporting USB audio digital out is the AK70, first among Astell&Kern devices. Connect diverse digital-input amps through USB to the AK70. It can transfer DSD in native through DoP or convert DSD into PCM output for portable amps that do not support DoP. *DoP (DSD over PCM) is a standard of transferring DSD data to USB interface by mounting DSD data onto PCM data drames.
Utilising a CS4398 Cirrus Logic single DAC chip, the AK70 plays back 24 bits 192kHz signals into bit-to-bit type. 32bit audio is downsampled using a sample-rate converter. In addition, DSD64/128 can be played back through conversion to PCM. With approximately 12 hours of continuous playback, an internal storage of 64GB and expandable memory up to 128GB, the AK70 never runs out of songs to play.
The AK70 can be used as a USB DAC that can double as an embedded sound card by connecting with a PC/Mac through the USB port. By using the AK70 as a USB DAC, it can support up to 24bit 96kHz bit to bit, providing much richer sound through superior ambience and resolution way beyod the limits of an embedded sound card.
Digital Audio Converter (DAC) Cirrus Logic CS4398 x1 (Single DAC) Memory Internal: 64GB
External: microSD up to 128GB x1
Battery 2200mAh 37V Li-Polymer Battery
~12 hours continuous playback
Supported Formats WAV, FLAC, WMA, MP3, OGG, APE(Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF Sample Rate FLAC, WAV, ALAC, AIFF: 8kHz ~ 192kHz (8/16/24bits per sample)
DSD: DSD64, Stereo / DSD128, Stereo
I/O Ports Input: USB Micro-B input (for charging and data transfer)
Output: PHONES (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Frequency Response ±0.075dB (Condition: 20Hz ~ 20kHz) Unbalance & Balance
±0.56dB (Condition: 10Hz ~ 70kHz) Unbalance
±0.55dB (Condition: 10Hz ~ 70kHz) Balance
Output Impedance Unbalance: 2ohm
Signal-to-Noise Ratio (SNR) Unbalance: 116dB @ 1kHz
Balance: 116dB @ 1kHz
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