af kvik » 13. apr 2018, 21:28
Bits & Pieces..
LPF: OPA2107UA
Output buffer: OPA1622 (x6)
Caps: Panasonic Tantalum Organic Polymer Low ESR (16TQC100MYF)
Potentiometer: Texas Instruments PGA2311UA (digitally-controlled analog VC, +31.5 to −95.5 dB with 0.5-dB Steps)
Front: Tempered glass, with factory mounted protection film
Machine Size: 6.5 x 11.5 x 1.6 cm
Weight: 180g
Sample rate
44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 352.8Khz, DSD 1bit DSD64, DSD128.
Audio format support
WAV: 16/24/32bit, 44.1-192khz; 24bit/352.8khz; fixed-point/floating point;
AIFF: 16/24/32bit, 44.1-192khz; 24bit/352.8khz
FLAC: 16/24bit, 44.1-192khz; 24bit/352.8khz; Compression level: 0-8;
APE: c1000 Fast, C2000 Normal, C3000 high:16/24bit, 44.1-192khz; C4000 Extra:16/24bit, 44.1-96khz;
ALAC: m4a containers, 16/24bit,44.1/48khz;
TTA: 16/24bit,44.1/48khz;
WV: 16/24bit,44.1/48khz; Compression level: Fast/normal/high/high Plus;
MP3: 16BIT,22.05/32/44.1/48KHZ,96KBPS-320KBPS,CBR/VBR/ABR coding;
AAC: M4A container, 16BIT,44.1KHZ,AAC LC coding;
DTS: wav containers, dts-5.1/dts-es;
CUE: ansi/unicode/unicode Big Endian/utf-8 code;
DSD: diff, Dsf--1bit, dsd64-dsd128, DSD code; SACD iso-1bit DSD64 DSD code.
Recommended SD-cards: SANDISK Extreme (red and Yellow kind) and SONY 90m/s Black
Accessories
2.5 til 3.5 mm balanced adapter cable
USB2.0 SD card reader + 32GB Sandisk card (64GB for the first 200 customers)
Charging cable, but no charger (5V/2A smartphone charger will work, as will 5V/1A)
Custom PU leather cover
Modes
All to DSD mode puts all PCM files up to 1bit 5.6Mhz DSD signal (ie DSD128), then enters Ak4495seq's native DSD channel hardware decoding, allowing ordinary music files to experience DSD's hard-solution sound style (soft nature). QA361 all to DSD uses extremely high AK4137 to complete.
In normal mode, PCM files will also enter the AK4137 to a higher frequency of the PCM to ensure that the decoding noise frequency is high to far away from the band, so the hardware LPF design will be more conducive to ensure the natural flow of sound output. (Most high-end desktop DAC use similar design)
Femto-clock
QA361 uses the global unified high-precision double femtosecond clock, namely two femtosecond clock supply overall situation, including the main control single-chip microcomputer, CPLD, AK4137 frequency conversion, AK4495SEQ, digital output ... Are derived from these two femtosecond clock, which is equivalent to the DAC and the sound source with a clock synchronization function (such as DCs an excellent monomer clock synchronous supply CD turntable, digital frequency, DAC), the advantage is that sound knot image will be more condensed, more stable, And the trouble is that SCM code work time sequence and CPLD code must be strictly in accordance with the frequency of the audio clock customization and optimization (this is all the underlying code to write their own qls, of course, is not a problem at all).