Introduction; Features - dbx 576 Owner's Manual

Introduction

Thank you for purchasing the dbx 576 vacuum tube preamplifier and compressor. The 576 combines
high quality microphone and instrument preamplification with world-renowned dbx compression in
a single chassis to offer you a flexible input path to your audio devices.
The dbx 576Õs preamplifier circuit is a hybrid design consisting of a high-voltage class A vacuum tube
amplification stage, coupled with an ultra low noise, low distortion solid-state driver stage. The vac-
uum tube amplification stage is a classic, high plate-voltage design utilizing a pure class A topology.
A parallel-triode arrangement is employed, in addition to a fully-regulated plate supply to maximize
noise performance and transient response. The premium-grade 12AU7 vacuum tubes used in the dbx
576 are hand tested and graded specifically for gain, noise, and microphonics.
The compression section incorporates the features that have made dbx the standard for high quality
audio compression: Over Easyª compression curve, PeakPlusª limiting and the advanced dbx
V1ª VCA module that ensures high system performance. Precision 1% resistors are used through-
out the audio path to ensure performance stability and low noise. To ensure years of trouble-free oper-
ation, each dbx 576 must pass a rigorous set of performance tests and a 24-hour burn-in period before
it is shipped from the factory.
We recommend that you take a moment to read through this operation manual. It provides valuable
information that will assist you in setting up and operating your dbx 576.

Features

¥ Flexible configuration; useful as a single comprehensive input section or dual discrete channels
¥ Low noise, pure Class A vacuum tube preamplifier stage with adjustable Drive and Level controls
¥ Flexible semi-parametric EQ stage with low cut, midband Q select and hardwire bypass
¥ PeakPlusª Limiter available on both channels
¥ Mic, Line and Hi-Z instrument inputs to preamplifier
¥ Class A Vacuum tube stage in compressor section with Drive control
¥ Selectable dbx OverEasy
¥ Pre-EQ insert loop in preamp section, Sidechain loop in Compressor section
¥ Multi-source VU metering and Peak indication
¥ Ready for optional dbx
2
¨
compression curve
ª
Conversion System digital output module
TYPE IV