Behringer T1952 - Manual (Page 6)

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TUBE COMPOSER T1952
1. INTRODUCTION
In purchasing the new TUBE COMPOSER T1952, you have acquired an extremely efficient and universal
dynamics processor, which combines the precision of the solid state technology with the warmth and
liveliness of tube technology. The most commonly used dynamic functions are all present. Every channel has
its own independent compressor/limiter, an expander/gate and a peak limiter complemented by an
extremely low-noise tube stage. The precision and flexibility of the functions are the main outstanding features
of this high end unit.
Future proof BEHRINGER technology
The philosophy behind BEHRINGER products guarantees a no-compromise circuit design and employs the
best choice of components. The op-amps, type 4580, used in the TUBE COMPOSER are chosen for their
superior signal-to-noise ratio, low distortion and linear performance. Additionally, the TUBE COMPOSER uses
high quality resistors and capacitors with very tight tolerances, high-grade switches as well other selected
components.
Modern manufacturing and design principles
Our engineering team has made it possible to enhance the traditional tube circuitry (particularly for our
TUBE COMPOSER) and adapt it to meet the high sound quality and dynamics requirements of modern,
pro-level audio technology. The fact that we are still fascinated by “antique” tube radios and amps as well as
the fine and warm tonal character that we usually associate with them, are the reasons why vacuum tubes
have kept their ground even in state-of-the-art circuit topologies used especially in professional audio
technology or high-end devices. We are particularly proud that we have found a highly effective symbiosis
between solid-state and tube technologies making them affordable to almost anybody in audio technology.
With the exception of 2 select 12AX7/ECC83 tubes, the TUBE COMPOSER T1952 is based on SMD
technology (Surface Mounted Device). These subminiature components known from aerospace applications
ensure both extreme packing density and greater reliability. The TUBE COMPOSER is manufactured under
ISO9000 certified management system.
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Please keep the manual after reading, in order to use it for future reference.
1.1 The concept
IKA (Interactive Knee Adaptation) compressor
Our proven IKA (Interactive Knee Adaptation) circuitry successfully combines the concept of a “Hard Knee”
compressor with the characteristics of a “soft knee” approach. This program-dependent control characteristic
forms the prerequisite both for “inaudible” and musical program compression and for creative and highly
effective dynamics processing.
With its IKA circuitry the TUBE COMPOSER is capable of delivering outstanding musical results both in
studio and live P.A. applications.
Additionally, the TUBE COMPOSER’s side chain filter allows for limiting the influence low-frequency signal
portions usually have on the control logic, so that the compression ratio is mainly determined by those
frequencies that are essential to the loudness perceived by the listener—the midrange frequencies.
IRC (Interactive Ratio Control) expander
A basic problem in the use of a compressor is the fact that the noise floor is highly amplified during quiet
sections or when there are music pauses. This effect is exaggerated when the compression ratio is in-
appropriate. In order to eliminate this problem, one would normally use an additional expander or gate. The
noise is then simply faded out in the quiet sections. However, simple expanders, even when they are used
correctly, drastically cut signals below the preset threshold. This effect becomes more noticeable during the
transition from signal to noise floor. This can mean, that the start or end of words can be cut on a vocal track.
A newly developed IRC (Interactive Ratio Control) expander has been integrated into the TUBE COMPOSER
the ratio of which, is automatically adjusted, depending on the program material. The result is an expander
which is less critical of adjustment and which is more tolerant in the presence of those signals which appear
slightly above the noise floor. Because of its new IRC circuit design, the BEHRINGER TUBE COMPOSERs
1. INTRODUCTION