Lab Measurements with the Audio Analyzer APX555 from Audio Precision
Since we own in our Lab the flagship Audio Analyzer APX555 from Audio Precision, we publish some measurement results from commercial devices.
Please note, that we offer measurements from your devices in our LAB. You will get world leading measurement equipment plus our experienced engineering. The results from an audio analyzer APX555 from Audio Precision are worldwide recognized as a reference. We can do small series batch testing as well. Please do not hesitate to contact us.
Mic preamplifier MPA102 description
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The MPA-102 from IMQ Stageline is a high-quality microphone amplifier for connecting microphones to a line input. This preamp also provides phantom power, as required by many microphones. As a special feature, the phantom power is also supplied in battery operation.
The gain can be adjusted in the range 20-70dB using a latching switch.
Characteristics
- 1 microphone input, XLR, balanced.
- Gain 20-70dB in 5dB steps
- LED green/red for operation/peak
- Phantom power +24V can be switched on, 48V is not available
- Microphone phase position switchable
- Analog filters: Lo-Cut 100Hz, Hi-Cut 12kHz, 12dB/Oct., switchable
- 1 preamp output
- 1 stereo line input
- 1 stereo line output
- Level control and panorama control for mixing the microphone signal to the stereo line channel
Technical data of the MPA102 (according to the manufacturer)
- Frequency range 20-20000Hz
- Input impedance Mic 2.2k Ohm Stereo Line 10k Ohm
- Outputs line sym. 1V/100 Ohm, 12V max.
- Outputs stereo line 1V/100 Ohm, 6 Vmax.
- Filter, low cut 100Hz/-3dB, 12dB/Oct.
- Filter, High Cut 12kHz/-3dB, 12dB/Oct.
- Gain, Mic 20-70dB
- Gain, stereo line 0dB
- S/N ratio, Mic > 66dB (unweighted)
- S/N ratio, line 80dB (unweighted)
- Harmonic distortion < 0.01%
- Dimensions (WxHxD) 116x55x125mm
- Power supply 15 V~ via the included mains power supply
- alternatively 4x9 V battery
Notes on the MPA102 preamplifier
- The phantom power is only 24V. Some condenser microphones cannot handle this low voltage.
- The MPA102 should definitely be operated with batteries, otherwise significant humming components will be noticeable. These are clearly visible in electrical measurements.
Mic preamplifier MPA102 measurement results
Set up
- Input via balanced mic input
- Gain dB
- All controls vertically upwards
- Phantom power off
- Powered by batteries
Signal to noise ratio
Frequency 1kHz Input level 20mV RMS
SNR: 86dB Z-weighted 20-20kHz. This means that the MPA 102 is better than the manufacturer's specifications, but it is also unclear what exactly was measured, especially at what amplification.
Gain above input level
Frequency 1kHz
Total Harmonic Distortion (THD) above the output level
Frequency 1kHz
Frequency response
Input level 20mV RMS
And the frequency response in detail
Filter on the MPA102
The MPA102 has individually switchable filters. A high pass from 100Hz and a low pass at 10kHz
Spectral analysis /FFT
Input is 20mV
When powered by the included (AC) power supply, you can see clear interference from the mains frequency and its harmonics.
