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Since the Preference Mic Pre provides two independent outputs, it always offers you two routes for one input channel. If, for example, a RackPack is configured as a channel strip, one pre- amp output can feed the next module while the second output is used to record the direct preamp signal. Another exemplary studio application is to send one signal directly into the A/D converter to be recorded in your DAW while the second signal is used for latency-free monitoring (e.g. cue mix for the singer). In live applications Output 1 can be routed to Front Of House (FOH) while Output 2 feeds the monitoring mixer. Pad The Pad function allows you to attenuate the input signal by 20 dB so that you can process even very high levels, i.e. from drums or brass instruments. Hi-Pass Filter The high-pass filter, also known as rumble filter, helps to eliminate any interferences within the lowest frequencies. The first order filter operates smoothly with 6 dB per octave, starting from 75 Hz with -3 dB. This characteristic usually helps in most cases and has the least sonic disadvantages. If you need to filter on a more extreme scale, even second order filters (12 dB/octave) are over strained frequently and sonic disadvantages become more and more apparent. In those cases a variable filter is the means of choice. Servo Drive Design The main focus during the development of the Preference Mic Pre was its acoustic transparency and its natural representation of the source signal. Reducing DC offsets in the audio signal paths is a decisive part of this design job. DC offsets are produced in relatively large amounts especially when amplifying a microphone signal because the signal is amplified by extreme factors from the pico volt range to 0dB nominal level. DC off- sets impair the signal quality as they induce noise and distortion that lead to a diffuse sound. The Preference Mic Pre's servo drive design minimizes these problems much more effectively than the common solution based on capacitors by setting the DC offset to almost 0 mV. In addition to that, the active servo drive circuitry tends to produce less distortions than passive capacitors. The servo drive design incorporates three operational amplifiers. The SSM 2019 is the first op-amp. The second op-amp acts as a sensor to detect voltage differences. These differences are then compensated for in a third op-amp working as summing stage. Specifications Audio Frequency Range 10 Hz bis > 200 kHz CMRR -84 dBu (at 1kHz with -30 dBu input level and 30 dB Gain) THD & N @ 1 kHz Input Level Gain THD & N -30 dBu 30 dB 0,0035% -60 dBu 60 dB 0,047% Noise Gain Noise Level A-weighted 72 dB -57,0 dBu 60 dB -69,0 dBu 30 dB -91,7 dBu E.I.N. (Equivalent Input Noise) -129,0 dBu Dynamic Range 114,0 dB Input XLR connector, electronically balanced Impedance unbalanced ca. 1,6 kOhm Impedance balanced ca. 3,2 kOhm Max. Input Level +18 dBu, +38 dBu with Pad activated Outputs Output 1: XLR connector, electronically balanced Impedance unbalanced ca. 75 Ohm Impedance balanced ca. 150 Ohm Max. Outpul Level +22 dBu Output 2: XLR connector, electronically balanced Impedance unbalanced ca. 75 Ohm Impedance balanced ca. 150 Ohm Max. Outpul Level +22 dBu Control Elements Mic Gain Range 18 dB to 72 dB Pad -20 dB High-Pass fg = 75 Hz (-3 dB) Phantom Power Supply 48 V Dimensions & Weight Height x Width x Depth 5.2 x 1.84 x 12.4 inches 132 mm x 46,9 mm x 315 mm Weight 0,3 kg/0,66 lbs Note: 0 dBu = 0.775 V. Specifications are subject to change without notice. |
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