About this report
This is a report for professionals with a suite of test of headphone amplifier.
You can see a simple report for "dummies" with explanations of the main characteristics for ASUS Xonar U7
A suite of tests for a headphone amplifier can be applied to just a universal output without a formal presence of an amplifier, if in this mode you can connect headphones to this output. Based on the results of the tests, you can understand the real picture, is the output powerful enough or not, with the initial data on the circuitry as a "black box".
You can see a simple report for "dummies" with explanations of the main characteristics for ASUS Xonar U7
A suite of tests for a headphone amplifier can be applied to just a universal output without a formal presence of an amplifier, if in this mode you can connect headphones to this output. Based on the results of the tests, you can understand the real picture, is the output powerful enough or not, with the initial data on the circuitry as a "black box".
Test report - general data ASUS Xonar U7 (as headphone amplifier)
| Average value of impedance band in 40 Hz - 15 kHz | 21.2 | ohm |
| Voltage: Pure or equal class A  / Maximum or before clipping level | -0.6/2.4 | dBV |
| 0.9/1.3 | VRMS | |
| Current: Pure or equal class A / Maximum or before clipping level | -1.5/31.1 | dB(mA) |
| 0.8/36.0 | mA |
Brief information
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Frequency response (as headphone amplifier)
| Channel: | Left | Right | |
| Variation in frequency response in band from 40 Hz - 15 kHz | -0.1, +0.0 | -0.1, +0.0 | dB |
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Impedance ASUS Xonar U7 (as headphone amplifier)
| Channel: | Left | Right | |
| Impedance average in band from 40 Hz - 15 kHz | 21.3 | 21.2 | ohm |
| The minimum value in band from 40 Hz - 15 kHz | 21.3 | 21.2 | ohm |
| The maximum value in band from 40 Hz - 15 kHz | 21.3 | 21.2 | ohm |
Comparison of basic characteristics AMPs
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Crosstalk ASUS Xonar U7 (as headphone amplifier)
| Channel: | Left | Right | |
| Crosstalk @ 1 kHz @ 15.8 ohm | -62.1 | -64.0 | dB |
| Crosstalk @ 1 kHz @ 24.5 ohm | -64.3 | -65.7 | dB |
| Crosstalk @ 1 kHz @ 30.5 ohm | -65.8 | -66.5 | dB |
| Crosstalk @ 1 kHz @ 62.4 ohm | -69.6 | -72.6 | dB |
| Crosstalk @ 1 kHz @ 100.0 ohm | -73.8 | -75.0 | dB |
| Crosstalk @ 1 kHz @ 198.9 ohm | -80.8 | -81.3 | dB |
| Crosstalk @ 1 kHz @ 300.0 ohm | -84.7 | -85.5 | dB |
| Crosstalk @ 1 kHz @ 763.0 ohm | -88.5 | -92.2 | dB |
| Crosstalk @ 1 kHz @ Not loaded | -93.3 | -93.9 | dB |
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Crosstalk Phase ASUS Xonar U7 (as headphone amplifier)
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Frequency response ASUS Xonar U7 with resistive load
Frequency response of amplifier with resistive load @ 40 Hz - 15 kHz
| Channel: | Left | Right | |
| TEST 16 Ω + ASUS Xonar U7 | 1.2 | 1.2 | dB |
| TEST 32 Ω + ASUS Xonar U7 | 0.9 | 0.9 | dB |
| TEST 64 Ω + ASUS Xonar U7 | 0.6 | 0.5 | dB |
| TEST 126 Ω + ASUS Xonar U7 | 0.3 | 0.3 | dB |
| TEST 256 Ω + ASUS Xonar U7 | 0.2 | 0.2 | dB |
| TEST 512 Ω + ASUS Xonar U7 | 0.1 | 0.1 | dB |
Brief information
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Frequency response ASUS Xonar U7 loaded dynamic headphone type
Frequency response of amplifier loaded dynamic headphone type @ 40 Hz - 15 kHz
| Channel: | Left | Right | |
| TEST 10000 Ω + ASUS Xonar U7 | 0.0 | 0.0 | dB |
| Grado GH4 Limited Edition + ASUS Xonar U7 | 2.7 | 2.6 | dB |
Brief information
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Frequency response ASUS Xonar U7 loaded type balance armature headphone type
Frequency response of amplifier loaded type balance armature headphone type @ 40 Hz - 15 kHz
| Channel: | Left | Right | |
| TEST 10000 Ω + ASUS Xonar U7 | 0.0 | 0.0 | dB |
| Campfire Andromeda + ASUS Xonar U7 | 13.1 | 13.0 | dB |
| Fearless S8F Freedom + ASUS Xonar U7 | 8.9 | 8.2 | dB |
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THD vs load vs output voltage ASUS Xonar U7
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Maximum voltage output level vs load ASUS Xonar U7
| Power characteristics of the | Voltage | Current | ||
| dBV | VRMS | dB(mA) | mA | |
| Equivalent class A | -0.6 | 0.9 | -1.5 | 0.8 |
| Equivalent class AB | 2.4 | 1.3 | 8.1 | 2.6 |
| Equivalent class B | 2.4 | 1.3 | 31.1 | 36.0 |
| Maximum mode | 2.4 | 1.3 | 31.1 | 36.0 |
| Volume Control Type | Analog | |
| Optimal range of volume control | 36.0 | dB |
Comparison ASUS Xonar U7 and another amplifiers by loudness (Volume Level)
Main characteristics of the ASUS Xonar U7
Brief information
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Maximum voltage output level vs load ASUS Xonar U7
| Load | Pure or equal class A | Optimal or equal class AB | Hard or equal class B | Max, before clipping | ||||
| dBV | VRMS | dBV | VRMS | dBV | VRMS | dBV | VRMS | |
| 15.8 ohm | -34.9 | 0.0 | -29.9 | 0.0 | -4.9 | 0.0 | -4.9 | 0.0 |
| 24.5 ohm | -33.1 | 0.0 | -24.1 | 0.0 | -3.1 | 0.0 | -3.1 | 0.0 |
| 30.5 ohm | -32.2 | 0.0 | -23.2 | 0.0 | -2.2 | 0.0 | -2.2 | 0.0 |
| 62.4 ohm | -25.1 | 0.1 | -15.1 | 0.1 | -0.1 | 0.1 | -0.1 | 0.1 |
| 100 ohm | -24.3 | 0.1 | -11.3 | 0.1 | 0.7 | 0.1 | 0.7 | 0.1 |
| 198.9 ohm | -16.5 | 0.1 | -4.5 | 0.1 | 1.5 | 0.1 | 1.5 | 0.1 |
| 300 ohm | -13.2 | 0.2 | -3.2 | 0.2 | 1.8 | 0.2 | 1.8 | 0.2 |
| 763 ohm | -9.9 | 0.3 | 2.1 | 0.3 | 2.1 | 0.3 | 2.1 | 0.3 |
| Not loaded | -0.6 | 0.9 | 2.4 | 0.9 | 2.4 | 0.9 | 2.4 | 0.9 |
Maximum level of amplifier current
| Load | Pure or equal class A | Optimal or equal class AB | Hard or equal class B | Max, before clipping | ||||
| dB(mA) | mA | dB(mA) | mA | dB(mA) | mA | dB(mA) | mA | |
| 15.8 ohm | 1.1 | 1.1 | 6.1 | 2.0 | 31.1 | 35.8 | 31.1 | 35.8 |
| 24.5 ohm | -0.9 | 0.9 | 8.1 | 2.6 | 29.1 | 28.6 | 29.1 | 28.6 |
| 30.5 ohm | -1.9 | 0.8 | 7.1 | 2.3 | 28.1 | 25.5 | 28.1 | 25.5 |
| 62.4 ohm | -1.0 | 0.9 | 9.0 | 2.8 | 24.0 | 15.8 | 24.0 | 15.8 |
| 100 ohm | -4.3 | 0.6 | 8.7 | 2.7 | 20.7 | 10.9 | 20.7 | 10.9 |
| 198.9 ohm | -2.5 | 0.8 | 9.5 | 3.0 | 15.5 | 6.0 | 15.5 | 6.0 |
| 300 ohm | -2.8 | 0.7 | 7.2 | 2.3 | 12.2 | 4.1 | 12.2 | 4.1 |
| 763 ohm | -7.5 | 0.4 | 4.5 | 1.7 | 4.5 | 1.7 | 4.5 | 1.7 |
Power
| Load | Pure or equal class A | Optimal or equal class AB | Hard or equal class B | Max, before clipping | ||||
| dBm | mW | dBm | mW | dBm | mW | dBm | mW | |
| 15.8 ohm | -16.9 | 0.0 | -11.9 | 0.1 | 13.1 | 20.3 | 13.1 | 20.3 |
| 24.5 ohm | -17.0 | 0.0 | -8.0 | 0.2 | 13.0 | 20.1 | 13.0 | 20.1 |
| 30.5 ohm | -17.0 | 0.0 | -8.0 | 0.2 | 13.0 | 19.8 | 13.0 | 19.8 |
| 62.4 ohm | -13.1 | 0.0 | -3.1 | 0.5 | 11.9 | 15.5 | 11.9 | 15.5 |
| 100 ohm | -14.3 | 0.0 | -1.3 | 0.7 | 10.7 | 11.8 | 10.7 | 11.8 |
| 198.9 ohm | -9.5 | 0.1 | 2.5 | 1.8 | 8.5 | 7.1 | 8.5 | 7.1 |
| 300 ohm | -8.0 | 0.2 | 2.0 | 1.6 | 7.0 | 5.0 | 7.0 | 5.0 |
| 763 ohm | -8.7 | 0.1 | 3.3 | 2.1 | 3.3 | 2.1 | 3.3 | 2.1 |
Brief information
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Spectrum of Total Harmonic Distortion vs Level ASUS Xonar U7 (as headphone amplifier)
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Spectrum of Multitone Distortion vs Level vs Load ASUS Xonar U7 (as headphone amplifier)
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Spectrum of IMD SMPTE vs Level ASUS Xonar U7 (as headphone amplifier)
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Spectrum of IMD CCIF vs Level ASUS Xonar U7 (as headphone amplifier)
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