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ΧΑΡΑΚΤΗΡΙΣΤΙΚΑ
| General specifications | |||
| Name / Model No. | K9 Pro | Hardware solution | DAC: AK4499, USB: XMOS XUF208, Bluetooth: QCC5124, LPF: OPA1612 * 2, volume IC: NJU72315 * 2, AMP: THX AAA788+ * 2, linear transformer |
| Color | Black | Volume Scroll | Potentiometer+ADC Sampling |
| Weight | ≈2750g | Channel balance | L12~R12 (0.5dB per level) |
| Gain | L/M/H | FiiO Control | Surpported |
| Bluetooth format indication | Surpported | Sampling rate indication | Surpported |
| Firmware upgrade | System firmware and Bluetooth version can be upgraded via USB | Deep standby | Long press the multi-function button for about 3s |
| Low battery reminder | / | Dimensions | ≈200×224.5×76mm |
| Bluetooth transmission | / | Bluetooth receiver (5.0) | AAC/SBC/aptX/aptX LL/aptX HD/LDAC/atpX Adaptive |
| Bluetooth format indicator | SBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green | Charging indicator | / |
| Maximum supported sampling rate | 384kHz-32bit/DSD256（USB DAC） | Recommended headphone impedance | 16~600 Ω |
| 192kHz-24bit (coaxial) | |||
| 96KHz-24bit (optical) | |||
| Buttons and interfaces | |||
| Button | Physical key + toggle switch | USB | Type-C, USB B (data transmission) |
| Single-ended line input interface | RCA socket | Balanced line input interface | 4.4mm balanced socket |
| Spdif in | Optical fiber socket | Digital coaxial input interface | RCA socket |
| Balanced output interface | 4.4mm socket, XLR4 balanced socket | Headphone output interface | Standard 6.35 mm socket |
| Balanced line output interface | XLR3 balanced socket | Single-ended line output interface | RCA socket |
| Power parameters | |||
| Power supply | AC 110-115V~/AC 220-230V~ （Recommended） | Battery capacity | / |
| Charging time | / | PO battery life | / |
| Audio parameters | |||
| Single-ended line output performance parameters | |||
| THD+N | ＜0.0007%(1kHz/10kΩ/dbA) | SNR | ≥123dB (dbA) |
| Crosstalk | ≥110dB (1kHz/10kΩ) | Noise floor | ＜1.9μV（dbA） |
| Frequency response | 20Hz~20kHz (-3dB) | Line Level | 2.5Vrms (1kHz/10kΩ) |
| Balanced line output performance parameters | |||
| THD+N | ＜0.0004%(1kHz/10kΩ/dbA) | SNR | ≥128dB (dbA) |
| Crosstalk | ≥123dB (1kHz/10kΩ) | Noise floor | ＜1.9μV（dbA） |
| Frequency response | 20Hz~20kHz (-3dB) | Line Level | 5Vrms (1kHz/10kΩ) |
| Single-ended headphone output performance parameters（6.35mm） | |||
| Continuous undistorted output power 1 | ≥1.1W（16Ω / THD+N＜1%， AUX IN) | Output impedance | ＜1Ω（32Ω） |
| Continuous undistorted output power 2 | ≥2W（32Ω /THD+N＜1%，AUX IN) | Crosstalk | ≥75dB (1 kHz/32Ω，AUX IN) |
| Continuous undistorted output power 3 | ≥278mW（300Ω / THD+N＜1%，AUX IN) | THD+N | ＜0.0005% (1 kHz/32Ω/dbA) |
| Noise floor | ＜2μV（dbA） | SNR | ≥123dB (dbA) |
| Frequency response | 20 Hz~20kHz (-3dB) | MAX Output Voltage | ＞26Vp-p |
| Balanced headphone output performance parameters（4.4mm/XLR4） | |||
| Continuous undistorted output power 1 | ≥1.1W（16Ω / THD+N＜1%，AUX IN) | Output impedance | ＜1Ω（32Ω） |
| Continuous undistorted output power 2 | ≥2W（32Ω /THD+N＜1%，AUX IN) | Crosstalk | ≥114dB (1 kHz，AUX IN) |
| Continuous undistorted output power 3 | ≥1.1W（300Ω / THD+N＜1%，AUX IN) | THD+N | ＜0.0004% (1 kHz/32Ω/dbA) |
| Noise floor | ＜3μV（dbA） | SNR | ≥123dB (dbA) |
| Frequency response | 5Hz~50kHz (-3dB) | MAX Output Voltage | ＞51Vp-p |
| Sampling frequency | 384 |
|---|---|
| DSD | 256 |
| USB | Ναι |
| Coaxial: | Ναί |
| Οπτικές: | Ναί |
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