Astell & Kern AK120 II Portable Digital Music Player

My loss your gain . The reason for selling is that I want to complete  to buy  a Tekton speakers . Includes the box, manuals , have front screen protector and also has another set of front and back protector . Includes leather cover Buttero made ​​in Italy. And a 32gb SanDisk micro SD.

Specifications

Dual DAC meets Balanced Output

We added the CS4398 Dual DAC and the balanced output method with sound quality proven through our flagship model. The AK120 2nd Generation provides the weighty sound through the CS4398 Dual DAC and the A-amp, while providing delicate melodies through the balanced output.

Balanced vs. Balanced Output

The unbalanced method is the most commonly used basic method which consists of “left and right signals + ground line”. This setup includes a ground line which blocks out external noises from the outside. However, since the ground line cannot block out all of the external noises completely, external noises can be mixed into the signals that are transmitted, which then result in changes to the sound. The longer the signals travel, the more external noises that will be mixed into the sound which is why it is used within a short distance of 1 to 2 meters. Unlike the unbalanced method, the balanced method has an additional cold signal to compliment the hot signal which reduces the external noises.

Display:

3.31inch WVGA (480 x 800) AMOLED Touchscreen

Supported Audio 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 (1bit 2.8MHz), Stereo / DSD128 (1bit 5.6MHz), Stereo

Output Level:

Unbalance 2.1Vrms / Balance 2.3Vrms (Condition No Load)

DAC:

Cirrus Logic CS4398 x2 (Dual DAC)

Decoding:

Support up to 24bit/192kHz Bit to Bit Decoding

Inputs:

USB Micro-B input (for charging & data transfer (PC & MAC)) Connection Mode : MTP (Media Device)

Outputs:

PHONES (3.5mm) / Optical Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)

Wi-Fi:

802.11 b/g/n (2.4GHz)

Bluetooth:

V4.0

Dimensions:

2.16 ”(55 mm) [W] x 4.64 ”(118 mm) [H] x 0.58 ”(14.9 mm) [D]

Weight:

6.24 oz (177 g)

Feature Enhancements:

Firmware upgrades supported (OTA)

Frequency Response:

±0.023dB (Condition: 20Hz~20kHz) Unbalance & Balance / ±0.3dB (Condition: 10Hz~70kHz) Unbalance & Balance

Signal to Noise Ratio:

116dB @ 1kHz, Unbalance / 117dB @ 1kHz, Balance

Crosstalk:

130dB @ 1kHz, Unbalance / 135dB @ 1kHz, Balance

THD+N:

0.0007% @ 1kHz, Unbalance / 0.0005% @ 1kHz, Balance

IMD SMPTE:

0.0004% 800Hz 10kHz(4:1) Unbalance / 0.0003% 800Hz 10kHz(4:1) Balance

Output Impedance:

Balanced out 2.5mm (1ohm) / PHONES 3.5mm (2ohm)

Clock Jitter:

50ps (Typ)

Battery

Capacity:

3,250mAh 3.7V Li-Polymer Battery Memory

Built-in Memory:

128GB [NAND]

External Memory:

microSD (Max 128GB) x1

Supported OS:

Windows XP, Windows Vista,7,8 (32/64bit), MAC OS X 10.7 and up