LM1875 stereo test report
| Testing device | LM1875 stereo module |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>LM1875 stereo module>E-MU1616m |
| Supply voltage bipolar | -25V...0...+25V |
| Load resistance | 4 Ohm |
| Testing power | 9W |
| Maximum power | 32W |
| 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 | +0.02, -0.06 |
Excellent |
| Noise level, dB (A) | -106.2 |
Excellent |
| Dynamic range, dB (A) | 106.2 |
Excellent |
| THD, % | 0.046 |
Good |
| THD + Noise, dB (A) | -65.5 |
Average |
| IMD + Noise, % | 0.074 |
Good |
| Stereo crosstalk, dB | -74.2 |
Good |
| IMD at 10 kHz, % | 0.065 |
Good |
| General performance | Very good |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -0.11, +0.01 |
-0.13, +0.02 |
| From 40 Hz to 15 kHz, dB | -0.05, +0.01 |
-0.06, +0.02 |
Noise level
Left |
Right |
|
| RMS power, dB | -104.6 |
-103.7 |
| RMS power (A-weighted), dB | -106.2 |
-106.1 |
| Peak level, dB FS | -82.9 |
-82.9 |
| DC offset, % | -0.0 |
-0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +104.5 |
+103.7 |
| Dynamic range (A-weighted), dB | +106.2 |
+106.1 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.04736 |
0.04752 |
| THD + Noise, % | 0.04737 |
0.04753 |
| THD + Noise (A-weighted), % | 0.06467 |
0.06490 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.07310 |
0.07488 |
| IMD + Noise (A-weighted), % | 0.03532 |
0.03234 |
Stereo crosstalk
Left |
Right |
|
| Crosstalk at 100 Hz, dB | -81 |
-87 |
| Crosstalk at 1000 Hz, dB | -65 |
-81 |
| Crosstalk at 10000 Hz, dB | -44 |
-59 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.08260 |
0.07819 |
| IMD + Noise at 10000 Hz, | 0.05704 |
0.05888 |
| IMD + Noise at 15000 Hz, | 0.05570 |
0.05811 |
Conclusions
| A very interesting case: almost all the characteristics of this amplifier are at a high level, except for
harmonic distortion. Why did it happen? This situation was probably obvious for the developers of this chip,
and yet the harmonic distortion remained at a fairly high level. To understand what is the reason, you need to
take another look at the harmonic distortion graph. It is striking that even harmonics predominate, but the odd
ones are significantly reduced, since the 2nd harmonic has a level of -73dB, and the 3rd harmonic has a level
of -96 dB. Obviously, the developers tried to highlight exactly the even harmonics, which give the sound volume,
make it juicier, since they sound one with the main tone and emphasize it, and they succeeded! The vast majority
of radio amateurs, and just music lovers, after LISTENING and REAL comparison with competitors, almost always opt
for the LM1875. Also, the lion's share of those who, after listening, prefer the competitors of this microcircuit,
most likely, they listened to a fake, of which 95% are on the market.
Bottom Line: A great sounding chip created by sound engineers. Developed, built-in protections, in addition to good sounding, make this microcircuit practically "unkillable". The only drawback of the LM1875 is power. This amplifier can be recommended for high quality bookshelf loudspeakers with woofer up to 16cm and full range loudspeakers. Also LM1875 can be recommended as a driver of tweeter / midrange speakers in Bi-amping and Tri-amping systems |
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