SPL Preference Mic Preamplifier

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SPL Preference Mic Preamplifier RPM

List Price: $459.00
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Availability: Usually Ships in 24 Hours
Product Code: 9999-01487

Description

SPL Preference Mic Preamplifier RPM Details

The SPL Preference Mic Pre for the SPL Rackpack offers preamplification values of up to +72 dB with lowest noise operation and a high common mode rejection.

SSM 2019

The Preference Mic Pre is suitable for all common dynamic and condenser microphones. It works along the principles of an instrumentation amplifier which is a technology that is also used in measurement and medical equipment due to its high common mode rejection of stray pick-ups. It is based on the semiconductor SSM 2019 which sounds more balanced than available alternatives. Low noise and distortion values as well as a broad bandwidth and a fast slew rate are its forte.

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 offsets 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. Of course an elaborate active servo drive circuitry is a more expensive solution than simply using passive capacitors, but especially in a microphone preamplifier this effort pays off with improved sound quality.

SPL Preference Mic Preamplifier RPM Features

A VU meter with two modes for average levels (VU) and peak levels
(PPM) displays the output levels.
A very stable phantom power supply (48 V) is provided to power condenser Microphones.
The polarity of the microphone can be switched with the phase reverse switch.
A high-pass filter protects against low frequency interferences.
Two LEDs are placed into the VU window to concentrate all displays in one area.
The signal LED (SIG.) indicates that an input signal is present, the overdrive LED (OVL) warns against potential overdrives.