SPL Channel One 2950, Руководство пользователя

Страница: 6 / 30

Many audio engineers know SPL’s specialized audio tools, following our philosophy “one
product for one task”. This aims at fast and simple operation in conjunction with high
processing quality to ensure highest musical performance.
With the Channel One we have produced a fully-featured channel strip which for the greater
part is based on the processing concepts already known in other products, such as the SPL
De-Esser and the DynaMaxx compressor. The very complex task of a channel strip profits
particularly from the innovative techniques that have always allowed the operation of SPL
equipment to be efficient and objective.
To a high degree the usual recording day is determined by a series of opposing time limits –
the singer/speaker desires a trouble-free and efficient recording; however, if technical prepa-
ration takes a long time because of unsuitable equipment, time will be lost, increasing the
costs and souring the working environment. The Channel One in all cases however allows
fast production without any loss of professional precision and diligence.
The Channel One consists of a transistor/tube pre-amplifier with microphone-, line- and
instrumental inputs, a de-esser, a compressor/limiter with noise gate, an equalizer (EQ)
section and a latency-free headphone monitor.
So the Channel One has all tools on board for recording a track – along with the preamp it
offers the most needed processors for corrective and creative sound design.
To maximize user friendliness all modules have been reduced to the most important regu-
lating and switching facilities. Fast and effective operation is in no way impeded, quite the
opposite – it is supported. And more time remains for the creative tasks.
From the outset great value was placed on high flexibility. An example are the three separate
inputs for microphone, line signals or instruments, each of which has been optimized to its
function.
A twin triode tube is utilized in the process at two positions – one immediately after the
preamplifier stage and the other at the end of the chain, so that the processed signal passes
the tube stage twice. This construction combines the advantages of the transistor pre-
amplifier stage (high performance with minimal distortion and low noise) with the improved
musical expression of the tone produced by tubes.
The microphone input can optionally be equipped with an input transformer from Lundahl.
The input transformer delivers a fivefold amplified microphone level to the preamplifier. This
additional amplification reduces the equivalent load to the preamplifier electronics. The
balanced outputs can also be equipped with a Lundahl transformer.
The optional 24 bit/96 kHz AD converter module provides digital outputs. An additional input
socket on the Channel One may feed a second signal to the AD converter.
Displays and LEDs for signal level, gain reduction, s-detection, clip warning, warm-up status
and signal presence are combined and contained in a single display area to be monitored at
a glance.
A special feature of the PCB layout is the central star ground wiring: Disturbing influences
that could affect the ground paths are minimized by separating audio-ground from the
remaining equipment. This leads, in the truest sense of the word ”clean”, to considerably
improved tonal quality.
The scatter free toroidal transformer supplies the equipment with the necessary voltages
and forms the basis for a clean electrical supply to all parts of the circuitry.
Principles
6
Channel One
Introduction