SPL TwinTube, Руководство пользователя

Страница: 16 / 52

16
Analog Elemental Series
The Modules
Premium Mic Pre | Introduction
Premium Mic Pre | Control Elements
Each of the Analog Elemental Series units combines two of the following modules. For more
information on the design of the devices, refer to the Introduction on page 8. Here you will
find a detailed description of the single modules.
When recording acoustic instruments or vocals, using a microphone is inevi-
table. The actual output level of a microphone is very low and therefore has to
be boosted to studio or line level (0 dB) with a preamplifier. Sometimes signals
have to be boosted by a factor of 2000 or more. As a consequence, the resulting
sound quality provided by the preamp is of paramount importance, so a good
microphone preamp that does not overdrive is the definitive requirement in order to
record acoustic instruments or vocals with sufficient dynamics and untainted sound.
The section “technology“ from page 19 explains how the Premium Mic Pre complies with
these requirements on the highest level and how it delivers premium results even in difficult
and critical set-ups.
Even the less technically interested users get an impression of the great efforts it takes in
development, circuitry design, selection of parts and assembly to create a product on the
Premium Mic Pre’s quality level. From there we deduce a superior price/performance ratio
– emphasizing on the performance which lends the Premium Mic Pre a world-class sound
quality.
Features
• The Premium Mic Pre offers preamplification values of up to +72 dB with lowest noise
operation and a high common mode rejection.
• Input stage and output are equipped with Lundahl transformers (High Performance
Series).
• 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.
• The signal LED indicates that an input signal is present
Mic Gain
With the Mic Gain control you can regulate the preamplification of the microphone signal.
It ranges from +18 dB to +72 dB. The input stage can handle input levels of up to 10 dB. The
value set with the Mic Gain control defines the output level.
When you set the Mic Gain you have to consider the type of microphone that you are using
(dynamic or condenser microphone) as well as its sensitivity. The sensitivity of a dynamic
microphone is at around 2 mV/Pa whereas the sensitivity of a condenser microphone can be
up to 20 mV/Pa. The result is a difference in output of 20 dB.
You should also consider the sound pressure level of the sound source, the distance of the
microphone to it and the acoustics of the room when you set the preamplification.