TDA7293 amplifier testing. Characteristics Measurement
| Testing device | TDA7293 amplifier |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>TDA7293 amplifier>E-MU1616m |
| Supply voltage bipolar | -30V...0...+30V |
| Load resistance | 4 Ohm |
| Testing power | 20W |
| Maximum power | 110W |
| 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 | +0.04, -0.22 |
Very good |
| Noise level, dB (A) | -108.5 |
Excellent |
| Dynamic range, dB (A) | 108.4 |
Excellent |
| THD, % | 0.00704 |
Very good |
| THD + Noise, dB (A) | -81.5 |
Good |
| IMD + Noise, % | 0.00803 |
Very good |
| IMD at 10 kHz, % | 0.011 |
Very good |
| General performance | Very good |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -0.57, +0.04 |
-0.57, +0.04 |
| From 40 Hz to 15 kHz, dB | -0.22, +0.04 |
-0.22, +0.04 |
Noise level
Left |
Right |
|
| RMS power, dB | -107.7 |
-107.7 |
| RMS power (A-weighted), dB | -108.5 |
-108.5 |
| Peak level, dB FS | -88.4 |
-88.4 |
| DC offset, % | -0.0 |
-0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +107.6 |
+107.6 |
| Dynamic range (A-weighted), dB | +108.4 |
+108.4 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.00704 |
0.00704 |
| THD + Noise, % | 0.00712 |
0.00712 |
| THD + Noise (A-weighted), % | 0.00838 |
0.00838 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.00803 |
0.00803 |
| IMD + Noise (A-weighted), % | 0.00740 |
0.00740 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.01449 |
0.01449 |
| IMD + Noise at 10000 Hz, | 0.00837 |
0.00837 |
| IMD + Noise at 15000 Hz, | 0.01015 |
0.01015 |
Conclusions
| The record low noise and distortion level in this implementation of the TDA7293 in combination with the
field-effect transistors of the output stage makes this amplifier a very high-quality device in terms of
sound, close to the sound of a tube.
Summary: Perhaps one of the best microcircuit amplifiers in class AB. It is recommended to use this amplifier in building a high-quality sound path with both bookshelf and floor acoustics. Further, objective, improvement in the quality of the "amplifying" part of the sound path will necessarily entail material costs by an order of magnitude, or even several orders of magnitude higher |
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