Testing the SUBWOOFER 500W amplifier. Measurements, specifications
| Testing device | Amplifier SUBWOOFER 500W |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>Amplifier SUBWOOFER 500W>E-MU1616m |
| Constant voltage DC | -73V...0...+73V |
| Load resistance | 4 Ohm |
| Testing power | 300W |
| Maximum power | 466W |
| Output transistors | 2SA1943/2SC5200 TOSHIBA |
| Quiescent current | 20mA |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.2 dB / -0.2 dB |
| Mono mode | ON |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.28, -0.44 |
Good |
| Noise level, dB (A) | -108.6 |
Excellent |
| Dynamic range, dB (A) | 107.9 |
Excellent |
| THD, % | 0.051 |
Average |
| THD + Noise, dB (A) | -67.4 |
Average |
| IMD + Noise, % | 0.062 |
Good |
| IMD at 10 kHz, % | 1.099 |
Average |
| General performance | Good |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -1.33, +0.28 |
-1.33, +0.28 |
| From 40 Hz to 15 kHz, dB | -0.44, +0.28 |
-0.44, +0.28 |
Noise level
Left |
Right |
|
| RMS power, dB | -107.8 |
-107.8 |
| RMS power (A-weighted), dB | -108.6 |
-108.6 |
| Peak level, dB FS | -75.6 |
-75.6 |
| DC offset, % | -0.0 |
-0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +107.6 |
+107.6 |
| Dynamic range (A-weighted), dB | +107.9 |
+107.9 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.05131 |
0.05131 |
| THD + Noise, % | 0.05134 |
0.05134 |
| THD + Noise (A-weighted), % | 0.04253 |
0.04253 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.06166 |
0.06166 |
| IMD + Noise (A-weighted), % | 0.04772 |
0.04772 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.22012 |
0.22012 |
| IMD + Noise at 10000 Hz, | 0.09246 |
0.09246 |
| IMD + Noise at 15000 Hz, | 2.98326 |
2.98325 |
Maximum power
Calculation formula |
Meaning |
|
| Maximum power, W | (Vrms x Vrms) / 4 Ohm |
466 |
Conclusions
| The original goal of developing this module was to create a simple, reliable and relatively cool amplifier for a
subwoofer or concert acoustics with an emphasis on power and reliability, and this task has been fully completed.
Bipolar output transistors provide deep and rich bass, and in idle mode the amplifier generates almost no heat,
despite the fact that it is class AB.
Summary: an excellent and powerful solution for building a subwoofer amplifier that does not require any settings and is ready to go right away. The module should not be considered as the basis for building a high-quality power amplifier for high-level speaker systems, its task is to effectively drive a subwoofer speaker or concert acoustics, where the requirements for an amplifier are different from home Hi-Fi systems. You can buy an amplifier in our store kit-amp.com |
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