Performance measurement. Testing of the headphone amplifier, A class Mini

Headphone amplifier, A class Mini

Testing device Headphone amplifier, A class Mini
Sampling mode 24-bit, 48 kHz
Interface E-MU1616m
Testing chain E-MU1616m>Headphone amplifier, A class Mini>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 -0.5 dB / -0.5 dBБ
Mono mode OFF
Calibration singal, Hz 1000
Polarity correct/correct



Summary

Frequency response (from 40 Hz to 15 kHz), dB
+0.06, -0.07
Excellent
Noise level, dB (A)
-103.3
Excellent
Dynamic range, dB (A)
103.2
Excellent
THD, %
0.00786
Very good
THD + Noise, dB (A)
-79.4
Good
IMD + Noise, %
0.00731
Excellent
Stereo crosstalk, dB
-69.0
Good
IMD at 10 kHz, %
0.00737
Excellent
General performance
 
Very good



Frequency response

Spectrum graph

 
Left
Right
From 20 Hz to 20 kHz, dB
-0.17, +0.02
-0.16, +0.06
From 40 Hz to 15 kHz, dB
-0.10, +0.02
-0.07, +0.06



Noise level

Spectrum graph

 
Left
Right
RMS power, dB
-102.2
-102.2
RMS power (A-weighted), dB
-103.3
-103.3
Peak level, dB FS
-79.3
-79.7
DC offset, %
-0.0
-0.0



Dynamic range

Spectrum graph

 
Left
Right
Dynamic range, dB
+102.1
+102.2
Dynamic range (A-weighted), dB
+103.2
+103.3
DC offset, %
+0.00
-0.00



THD + Noise (at -3 dB FS)

Spectrum graph

 
Left
Right
THD, %
0.00803
0.00769
THD + Noise, %
0.00824
0.00790
THD + Noise (A-weighted), %
0.01093
0.01046



Intermodulation distortion

Spectrum graph

 
Left
Right
IMD + Noise, %
0.00747
0.00715
IMD + Noise (A-weighted), %
0.00582
0.00555



Stereo crosstalk

Spectrum graph

 
Left
Right
Crosstalk at 100 Hz, dB
-70
-70
Crosstalk at 1000 Hz, dB
-68
-68
Crosstalk at 10000 Hz, dB
-53
-52



IMD (swept tones)

Spectrum graph

 
Left
Right
IMD + Noise at 5000 Hz,
0.00914
0.00866
IMD + Noise at 10000 Hz,
0.00656
0.00639
IMD + Noise at 15000 Hz,
0.00679
0.00670



Conclusions

  The symmetrical amplifier circuit based on complementary transistors has already become a "classic", which has proved not only the right to exist, but also won the hearts and ears of a huge number of music lovers. The buffer on the op-amp allows you to slightly change the character and sound quality with the replacement of the chip. The amplifier is assembled on DIP elements, which we managed to place on a whip only 5x5 cm. Suppression of harmonics and noise at a very high level. Despite the massive radiators, the amplifier heats up quite a lot, and therefore, it is necessary to provide for good ventilation of the case.

Bottom Line: A wonderful, transistorized amplifier with high sound quality. The amplifier is suitable for those who want to know how the Lehmann Audio Black Cube sounds and also has limited space in the cabinet. You can buy an amplifier from our store kit-amp.com. To unleash the potential of this amplifier, both a signal source and headphones of a sufficiently high level are recommended.




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