TDA7294 inverting amplifier testing. Characteristics Measurement
| Testing device | TDA7294 inverting amplifier |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>TDA7294 inverting amplifier>E-MU1616m |
| Supply voltage bipolar | -30V...0...+30V |
| Load resistance | 4 Ohm |
| Testing power | 20W |
| Maximum power | 100W |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.4 dB / -0.4 dB |
| Mono mode | ON |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.05, -0.26 |
Very good |
| Noise level, dB (A) | -102.2 |
Excellent |
| Dynamic range, dB (A) | 102.1 |
Excellent |
| THD, % | 0.018 |
Good |
| THD + Noise, dB (A) | -72.6 |
Average |
| IMD + Noise, % | 0.011 |
Very good |
| IMD at 10 kHz, % | 0.024 |
Very good |
| General performance | Very good |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -0.56, +0.05 |
-0.56, +0.05 |
| From 40 Hz to 15 kHz, dB | -0.26, +0.05 |
-0.26, +0.05 |
Noise level
Left |
Right |
|
| RMS power, dB | -100.0 |
-100.0 |
| RMS power (A-weighted), dB | -102.2 |
-102.2 |
| Peak level, dB FS | -81.2 |
-81.2 |
| DC offset, % | -0.0 |
-0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +99.8 |
+99.8 |
| Dynamic range (A-weighted), dB | +102.1 |
+102.1 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.01799 |
0.01799 |
| THD + Noise, % | 0.01812 |
0.01812 |
| THD + Noise (A-weighted), % | 0.02348 |
0.02348 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.01117 |
0.01117 |
| IMD + Noise (A-weighted), % | 0.00873 |
0.00873 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.02206 |
0.02206 |
| IMD + Noise at 10000 Hz, | 0.02180 |
0.02180 |
| IMD + Noise at 15000 Hz, | 0.02857 |
0.02857 |
Conclusions
| The inverting inclusion of the microcircuit allows you to avoid using a capacitor in the OOS circuit, which in turn, has a positive effect on sound quality. Also in this implementation, 3 is lowered (the most unpleasant) harmonic, which, in combination with the field-effect transistors of the output stage, makes this amplifier the closest to tube sound. At the same time, the inverting TDA7294 is slightly more susceptible to noise and interference. On the other hand, the real noise level does not exceed -100dB, which is much lower than the hearing threshold for any acoustics in complete silence. |
|
Bottom Line: Perhaps one of the best microcircuit amplifiers in class AB. Inverting turn-on implementation allows you to squeeze the maximum out of this chip, which in turn puts this amplifier on a par with transistor analogs of a fairly high level. You can buy the module from our store kit-amp.com. It is recommended to use this amplifier in building a high-quality audio path. both with shelf and floor acoustics. Further, objective, improving the quality of the "amplifying" part sound path, will necessarily entail material costs by an order of magnitude, or even several orders of magnitude higher |
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