| Astell&Kern KANN Ultra Digital Audio Player Specifications | |
| General Specifications | |
| Model | KANN ULTRA |
| Body Colour | Astro Gray |
| Body Material | Aluminium |
| Display | 5.5" HD 1080 × 1920 touchscreen |
| Supported Audio Formats | WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA |
| Sample Rate | PCM: 8kHz–768kHz (8/16/24/32bit per sample) DSD Native: DSD64 / 128 / 256 / 512 (Stereo) |
| Output Level | |
| [Low Gain] | Unbalanced: 2Vrms │ Balanced: 4Vrms |
| [Mid Gain] | Unbalanced: 4Vrms │ Balanced: 8Vrms |
| [High Gain] | Unbalanced: 6Vrms │ Balanced: 12Vrms |
| [Super Gain] | Unbalanced: 8Vrms │ Balanced: 16Vrms |
| Pre/Line Out | Unbalanced: 2Vrms │ Balanced: 4Vrms |
| Core Hardware | |
| CPU | Octa-core processor |
| DAC | Dual ES9039MPRO |
| Decoding Support | Up to 32bit / 768kHz bit-to-bit playback |
| Inputs & Outputs | |
| Input | USB Type-C (charging, PC & Mac) |
| Headphone Out | 3.5mm (Unbalanced/Optical) / 4.4mm (Balanced, 5-pole) |
| Pre · Line Out | 3.5mm (Unbalanced) / 4.4mm (Balanced, 5-pole) |
| Wireless Connectivity | |
| Wi-Fi | 802.11 a/b/g/n/ac (2.4 / 5GHz) |
| Bluetooth | V5.3 (A2DP, AVRCP, aptX-HD, LDAC, LHDC) |
| Physical | |
| Dimensions (W × H × D) | 82.4 × 141.1 × 24.4 mm · 3.24” × 5.55” × 0.96” |
| Weight | 390 g · 13.75 oz |
| Operating Temperature | 0℃ – 40℃ (32℉ – 104℉) |
| Audio Performance | |
| Frequency Response (Headphone Out) | ±0.006dB (20Hz–20kHz) Unbalanced │ ±0.004dB Balanced ±0.016dB (20Hz–70kHz) Unbalanced │ ±0.020dB Balanced |
| Frequency Response (Pre Out) | ±0.022dB (20Hz–20kHz) Unbalanced │ ±0.023dB Balanced |
| Frequency Response (Line Out) | ±0.002dB (20Hz–20kHz) Unbalanced │ ±0.002dB Balanced |
| S/N Ratio (Headphone Out) | 115dB (Unbalanced) │ 119dB (Balanced) |
| S/N Ratio (Pre Out) | 110dB (Unbalanced) │ 126dB (Balanced) |
| S/N Ratio (Line Out) | 110dB (Unbalanced) │ 125dB (Balanced) |
| Crosstalk (Headphone Out) | 134dB (Unbalanced) │ 140dB (Balanced) |
| THD+N (Headphone Out) | 0.0004% (Unbalanced / Balanced) |
| IMD SMPTE | 0.0006% (800Hz / 10kHz, 4:1, All Outputs) |
| Output Impedance | |
| Headphone Out | 3.5mm: 1Ω │ 4.4mm: 1.3Ω |
| Pre Out | 3.5mm: 3.5Ω │ 4.4mm: 5.7Ω |
| Line Out | 3.5mm: 6.5Ω │ 4.4mm: 10.7Ω |
| Clock System | |
| Clock Jitter | 25 ps (typical) |
| Reference Clock Jitter | 200 femtoseconds |
| Storage | |
| Internal Memory | 128GB NAND |
| External Memory | microSD x1 (up to 1TB) |
| Battery | |
| Capacity | 8,400mAh 3.8V Li-Polymer |
| Charging Time | Approx. 3.5 hours (PD 3.0 Charger) |
| Playback Time | Approx. 11 hours (FLAC 16bit/44.1kHz, Vol.50, LCD Off, Low Gain) |
| Software & OS | |
| Firmware Upgrade | Supported (OTA) |
| Supported OS | Windows 8 / 10 / 11 (32/64bit), macOS X 10.7+ |