Headphone amplifier, A class. Testing, Measuring Characteristics
| Testing device | Headphone amplifier, A class |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>Headphone amplifier, A class>E-MU1616m |
| Supply voltage AC | 18V...0...18V |
| Load resistance | 68 Ohm |
| Testing power | 0.04W |
| Maximum power | 0.5W |
| Operational amplifier | NE5532 |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.4 dB / -0.4 dBБ |
| Mono mode | OFF |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.06, -0.04 |
Excellent |
| Noise level, dB (A) | -103.7 |
Excellent |
| Dynamic range, dB (A) | 103.7 |
Excellent |
| THD, % | 0.00575 |
Very good |
| THD + Noise, dB (A) | -82.0 |
Good |
| IMD + Noise, % | 0.00567 |
Excellent |
| Stereo crosstalk, dB | -67.0 |
Good |
| IMD at 10 kHz, % | 0.00593 |
Excellent |
| General performance | Very good |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -0.14, +0.01 |
-0.20, -0.04 |
| From 40 Hz to 15 kHz, dB | -0.06, +0.02 |
-0.04, +0.06 |
Noise level
Left |
Right |
|
| RMS power, dB | -102.6 |
-102.4 |
| RMS power (A-weighted), dB | -103.8 |
-103.7 |
| Peak level, dB FS | -77.0 |
-77.6 |
| DC offset, % | -0.0 |
-0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +102.7 |
+102.8 |
| Dynamic range (A-weighted), dB | +103.7 |
+103.8 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.00574 |
0.00577 |
| THD + Noise, % | 0.00607 |
0.00611 |
| THD + Noise (A-weighted), % | 0.00791 |
0.00795 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.00565 |
0.00569 |
| IMD + Noise (A-weighted), % | 0.00449 |
0.00450 |
Stereo crosstalk
Left |
Right |
|
| Crosstalk at 100 Hz, dB | -69 |
-70 |
| Crosstalk at 1000 Hz, dB | -66 |
-66 |
| Crosstalk at 10000 Hz, dB | -49 |
-49 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.00721 |
0.00719 |
| IMD + Noise at 10000 Hz, | 0.00525 |
0.00511 |
| IMD + Noise at 15000 Hz, | 0.00550 |
0.00533 |
Conclusions
| The amplifier is assembled according to the Lehmann Audio Black Cube circuit with optimization and minimization for tracks on a printed circuit board. The maximum distance on the printed circuit board of the signal part and the power supply part leads to minimization of interference and interference from the network. The amplifier operates in pure class A and is quite significant heats up during operation. |
|
Summary: A complete solution for building a high-end stationary headphone amplifier. You can buy an amplifier from us at kit-amp.com. The amplifier is suitable for those who want to know how the Lehmann Audio Black Cube sounds, and there is a desire to work with your hands. To unleash potential both a signal source and headphones of a sufficiently high level are recommended for this amplifier |
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