Measurement of characteristics. Testing the volume control ALPS rk27
| Testing device | Volume control ALPS rk27 |
| Sampling mode | 24-bit, 48 kHz |
| Interface | E-MU1616m |
| Testing chain | E-MU1616m>Volume control ALPS rk27>E-MU1616m |
| Supply voltage for switching the operating mode DC | 12V |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.6 dB / -0.6 dB |
| Mono mode | OFF |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.04, -0.16 |
Very good |
| Noise level, dB (A) | -115.4 |
Excellent |
| Dynamic range, dB (A) | 115.3 |
Excellent |
| THD, % | 0.00092 |
Excellent |
| THD + Noise, dB (A)) | -97.8 |
Excellent |
| IMD + Noise, % | 0.00151 |
Excellent |
| Stereo crosstalk, dB | -102.1 |
Excellent |
| IMD at 10 kHz, % | 0.00248 |
Excellent |
| General performance | Excellent |
Frequency response
Left |
Right |
|
| From 20 Hz to 20 kHz, dB | -0.29, +0.02 |
-0.30, +0.04 |
| From 40 Hz to 15 kHz, dB | -0.16, +0.02 |
-0.16, +0.04 |
Frequency response, loudness
Left |
Right |
|
| 3 POSITION From 20 Hz to 20 kHz, dB | -4.37, +10.21 |
-4.37, +10.21 |
| 3 POSITION From 40 Hz to 15 kHz, dB | -4.37, +8.14 |
-4.37, +8.14 |
| 6 POSITION From 20 Hz to 20 kHz, dB | -4.19, +9.15 |
-4.19, +9.15 |
| 6 POSITION From 40 Hz to 15 kHz, dB | -4.19, +8.02 |
-4.19, +8.02 |
| 9 POSITION From 20 Hz to 20 kHz, dB | -4.00, +9.30 |
-4.00, +9.30 |
| 9 POSITION From 40 Hz to 15 kHz, dB | -4.00, +8.19 |
-4.00, +8.19 |
| 11 POSITION From 20 Hz to 20 kHz, dB | -3.80, +9.23 |
-3.80, +9.23 |
| 11 POSITION From 40 Hz to 15 kHz, dB | -3.80, +8.18 |
-3.80, +8.18 |
Noise level
Left |
Right |
|
| RMS power, dB | -114.0 |
-114.1 |
| RMS power (A-weighted), dB | -115.4 |
-115.4 |
| Peak level, dB FS | -82.6 |
-83.0 |
| DC offset, % | +0.0 |
+0.0 |
Dynamic range
Left |
Right |
|
| Dynamic range, dB | +114.2 |
+114.2 |
| Dynamic range (A-weighted), dB | +115.3 |
+115.3 |
| DC offset, % | +0.00 |
-0.00 |
THD + Noise (at -3 dB FS)
Left |
Right |
|
| THD, % | 0.00094 |
0.00089 |
| THD + Noise, % | 0.00106 |
0.00102 |
| THD + Noise (A-weighted), % | 0.00131 |
0.00126 |
Intermodulation distortion
Left |
Right |
|
| IMD + Noise, % | 0.00153 |
0.00149 |
| IMD + Noise (A-weighted), % | 0.00140 |
0.00135 |
Stereo crosstalk
Left |
Right |
|
| Crosstalk at 100 Hz, dB | -107 |
-109 |
| Crosstalk at 1000 Hz, dB | -101 |
-101 |
| Crosstalk at 10000 Hz, dB | -81 |
-82 |
IMD (swept tones)
Left |
Right |
|
| IMD + Noise at 5000 Hz, | 0.00312 |
0.00276 |
| IMD + Noise at 10000 Hz, | 0.00195 |
0.00177 |
| IMD + Noise at 15000 Hz, | 0.00274 |
0.00251 |
Conclusions
| A very high quality volume control that leaves all the slider, resistive stereo controls far behind. It is
practically impossible to achieve such accuracy in channels using a conventional stereo potentiometer due to the
technology of applying a resistive layer and internal micro-backlashes of such potentiometers. The principle of
operation of this RG is based on switching between high-precision SMD metal-film resistors, which are soldered inside
on two separate printed circuit boards. With loudness off, this module makes little or no difference to the audio signal,
other than changing its level. Switchable loudness increases the versatility of the module and allows you to adjust the
tonal balance at low amplifier output levels.
Summary: Precision volume control built using quality components. The module is able to compete with such popular solutions as Nikitin's RG or Galetny RG. Switchable loudness allows you to get away from the correction circuits in the final amplifiers, which only reduces the overall level of distortion. The volume control can be purchased from us at kit-amp.com. The module is recommended for building a high-quality stereo power amplifier. |
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