Sound Performance Lab EQ MAGIX manual Control elements Input, 1 5 3 2, Mic / Line Line -30pB

Control

elements

Input

1 5 6

3 2 4

Mic / Line

Line -30pB

The INPUT stage of the EQ MAGIX is based on the SSM 2017 semicon- 1 ductor. The strengths of this particular component are its extremely low noise and distortion characteristics. Unlike discretely designed circuits, the SSM 2017 has 64 transistor functions (discretely up to 24), thus achieving a

common mode rejection of over 90 dB (measured at INSERT SEND). Preamplification of the input signal is determined by the MIC/LINE

control. The control range of the preamplification values ranges from +7dB to +65 dB. The maximum amplification value specified is a minimum value. The preamplifier stage provides up to +75 dB. This value can be lower, depending on the tolerance of the potentiometer, but it never falls below a value of +65 dB.

When setting the MIC/LINE value, take note of the transducer type (condensor or dynamic microphone) and the free-field transmission factor of the microphone type. The sound pressure level of the sound source to be recorded, the distance to the microphone and the room acoustics are other factors which also have to be taken into account when setting the MIC/LINE potentiometer. The free-field transmission factor of a dynamic microphone is around 2mV/Pa, that of a condensor microphone can be up to 20mV/Pa, which equals an increase in the output level of 20 dB.

The EQ MAGIX can also be used as a gain-on amplifier for Line signals. 2 The input sensitivity of the preamplifier stage is reduced by 30 dB by pres- sing the LINE -30 dB switch. The corrected preamplification value on the MIC/LINE control can be ascertained by subtracting 30 dB from the value set

on the potentiometer.

Alternatively, line signals can also be looped in via INSERT RETURN. However, in this case, it is not possible to match the level, (see INSERT - page 14).

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