Test report - March 21 2009
| Testing device | Fully rebuilt BOSE 4401 |
| Sampling mode | 24-bit, 48 kHz |
| Interface | M_Audio Transit USB |
| Testing chain | External loopback (line-out - line-in) |
| RMAA Version | 6.2.0 |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.5 dB / -0.5 dB |
| Mono mode | OFF |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.02, -0.02 |
Excellent |
| Noise level, dB (A) | -89.5 |
Good |
| Dynamic range, dB (A) | 85.2 |
Good |
| THD, % | 0.012 |
Good |
| THD + Noise, dB (A) | -77.4 |
Average |
| IMD + Noise, % | 0.025 |
Good |
| Stereo crosstalk, dB | -62.7 |
Average |
| IMD at 10 kHz, % | 0.017 |
Very good |
| General performance | Good |
Frequency response
| From 20 Hz to 20 kHz, dB | -0.09, +0.02 |
| From 40 Hz to 15 kHz, dB | -0.02, +0.02 |
Noise level
Left |
Right |
|
| RMS power, dB | -80.7 |
-80.9 |
| RMS power (A-weighted), dB | -89.8 |
-89.2 |
| Peak level, dB FS | -69.4 |
-67.1 |
| DC offset, % | +0.0 |
+0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +79.9 |
+80.0 |
| Dynamic range (A-weighted), dB | +85.3 |
+85.1 |
| DC offset, % | +0.00 |
+0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | +0.0114 |
+0.0117 |
| THD + Noise, % | +0.0216 |
+0.0217 |
| THD + Noise (A-weighted), % | +0.0132 |
+0.0138 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | +0.0252 |
+0.0253 |
| IMD + Noise (A-weighted), % | +0.0129 |
+0.0135 |
Stereo crosstalk
Left |
Right |
|
| Crosstalk at 100 Hz, dB | -62 |
-61 |
| Crosstalk at 1000 Hz, dB | -62 |
-62 |
| Crosstalk at 10000 Hz, dB | -57 |
-58 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.0172 |
0.0173 |
| IMD + Noise at 10000 Hz, | 0.0170 |
0.0172 |
| IMD + Noise at 15000 Hz, | 0.0169 |
0.0172 |