Description
Topping NX7 Portable Headphone Amplifier
The Topping NX7 Portable Headphone Amplifier can output 180mW of high power under a load of 300 ohms, and with the help of 3 step gain setting, the small body can easily beat the full sized headphones. It is worth mentioning that even when the output is 200mW, the load distortion is only 0.00008%. It can easily drive full size headphones with high performance.
Features
- Hi-Res Audio
- Easily drive full size headphones with high performance
- Equally outstanding while driving IEMs
- Compatible with 3.5mm headphones and 4.4mm plug headphones
- NFCA Amplification Circuitry
- 3 Step Gain Settings
- 1400mW Maximum Output Power
- 135dB Dynamic Range
- <0.1 Ohms Output Impedance
- <0.3 uVrms Noise Level
- Low Distortion 0.00007% THD+N
- 20h Battery Life
NFCA amplifier
The new amplifier circuit is specifically designed for portable amplifiers. The low idle power consumption allows for extended battery life. This is done while having 0.00007% THD+N and 135dB SNR. It’s powerful and clean enough for power hungry full sized headphones and sensitive IEMs.
Equally outstanding while driving IEMs
The low gain of NX7 is -13.8dB. When used with high-sensitivity in-ear headphones, there will be almost no trouble of potentiometer bias in the comfortable volume range. You will no longer need to worry about the embarrassment of the volume setting of high-sensitivity in-ear headphones.
Noise
The background noise of NX7 is only <0.3uV, which is inaudible and as quiet as the deep ocean. 50mW SNR is 104dB.
Impedance
The output impedance is NX7 is as low as 0.1ohms. Even if it is driving high-sensitivity IEMs, it will not introduce sound coloration. You no longer need to worry about sound matching.
Anti-mistouch and anti-breaking design
NX7 is designed with corner guards at both ends to protect the entire panel, effectively preventing the volume knob from being mistouched in the pocket, and greatly reducing the possibility of breaking the headphone plug.
20h battery life
Due to the optimisation for portable devices, the NX7 can get 20h of battery life at low and medium gains; even if it is switched to high gain, it can also get 10h of battery life.
Specifications
| THD+N @1kHz (A-wt) | <0.00008% @Output=200mW (32Ω) |
| 3.5mm & 4.4mm Headphone Output | <0.00007% @Output=83mW (300Ω) |
| THD @20-20kHz (90kBW) | <0.0010% @Output=200mW (32Ω) |
| 3.5mm & 4.4mm Headphone Output | <0.0002% @Output=83mW (300Ω) |
| SNR @MAX OUT 1kHz (A-wt) | 135dB |
| 3.5mm & 4.4mm Headphone Output | |
| SNR @50mV OUT 1kHz | 104dB |
| 3.5mm & 4.4mm Headphone Output | |
| Dynamic Range @1kHz (A-wt) | 135dB |
| 3.5mm & 4.4mm Headphone Output | |
| Frequency Response | 20Hz-40kHz (±0.1dB) |
| 3.5mm & 4.4mm Headphone Output | |
| Output Level | 7.4Vpp @G=L |
| 3.5mm & 4.4mm Headphone Output | 11Vpp @G=M |
| 21Vpp @G=H | |
| AP measured noise level@A-wt | <0.7uVrms @G=L |
| 3.5mm & 4.4mm Headphone Output | <0.7uVrms @G=M |
| <2.0uVrms @G=H | |
| Actual noise level* @A-wt | <0.3uVrms @G=L |
| 3.5mm & 4.4mm Headphone Output | <0.3uVrms @G=M |
| <1.3uVrms @G=H | |
| Channel Crosstalk @1kHz | -91dB |
| 3.5mm / 4.4mm Headphone Output | -96dB |
| Input Sensitivity | 13Vrms @G=L |
| 3.5mm & 4.4mm Headphone Output | 4Vrms @G=M |
| 1.5Vrms @G=H | |
| Gain | -13.8dB @G=L |
| 3.5mm & 4.4mm Headphone Output | -0.1dB @G=M |
| 13.9dB @G=H | |
| Output Impedance | <0.1Ω |
| 3.5mm & 4.4mm Headphone Output | |
| Output Power | 1200mW x 2 @16Ω THD+N<0.1% |
| 1400mW x 2 @32Ω THD+N<0.1% | |
| 820mW x 2 @64Ω THD+N<0.1% | |
| 180mW x 2 @300Ω THD+N<0.1% | |
| 90mW x 2 @600Ω THD+N<0.1% | |
| Adapter Impedance | >8Ω |
| Battery Life | G=L/M >20H |
| G=H >10H | |
| After low battery warning (G=L/M) >2H | |
| After low battery warning (G=H) >1H | |
| Battery Capacity | 4000mAh |
| Dimensions | 13.5 x 7.0 x 1.6cm |
| *Note: The actual noise level is obtained by boosting the noise of NX7 by 40dB using a low noise amplifier in front of the APx555B then dividing the measured noise by 100 times |
