3.6. Analog Input Connectors
XLR/TRS combo jacks 1-4
On the front of the device, four combined XLR/TRS inputs labeled "1" to "4" can be used for microphone,
line and instrument signals. Phantom power (48 V) for microphones can be activated on each XLR input,
high impedance ("Hi-Z") can be activated when using unbalanced TS connectors. Both XLR and TRS
jacks accept balanced signals and maintain full symmetry internally all the way to the A/D converter.
Phantom power is not applied at the TRS inputs.
XLR inputs 5-12
Eight additional XLR inputs labeled "5" to "12" can be used for microphone and line level signals. The
internal circuits are identical to the first four channels in XLR mode, with a fully symmetrical design.
When using unbalanced XLR, be sure to connect pin 3 (negative/"cold") to pin 1 (ground), to
avoid noise from the unconnected pin 3 input.
3.6.1. Analog Input Specifications
XLR In 1-12
• Input: XLR, electronically balanced
• Input impedance: 3.4 kOhm
• Gain range: 75 dB, 1 dB steps
• Resolution AD: 24 bit
• Frequency response @ 44.1 kHz, -0.1 dB: 8 Hz – 20.8 kHz
• Frequency response @ 96 kHz, -0.5 dB: 4 Hz – 29.2
[1]
• Frequency response @ 192 kHz, -1 dB: 3 Hz – 43.7
[1]
• THD @ 30 dB gain: < -110 dB, < 0.00032 %
• THD+N @ 30 dB gain: < -104 dB, < 0.00063 %
• Channel separation: > 110 dB
• Signal to Noise ratio (SNR): 118 dB RMS unweighted, 121 dBA
• Maximum input level, Gain 0 dB: +18 dBu
• Maximum input level, Gain 75 dB: -57 dBu
[1]
optimized impulse response filter, see Section 3.7, “Frequency and Impulse Response”
TRS In 1-4
As above, but:
• TRS jack, balanced
• Gain range: 42 dB, 1 dB steps
• Maximum input level, Gain 8 dB: +21 dBu
• Maximum input level, Gain 50 dB: -21 dBu
• Switchable high impedance (unbalanced TS): 1 MOhm
RME 12Mic User’s Guide
3.6. Analog Input Connectors |
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