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Thank you for purchasing the dbx 586 vacuum tube preamplifier. This product was developed to help you
improve the sound of your digital and analog recordings, and live performances.The dbx 586 offers a bet-
ter alternative to using the average quality microphone preamps found in the typical multi-input console.
For economic reasons, these console preamps are typically of lower quality than a single, dedicated unit.
You can use the dbx 586 to get your basic tracks sounding great and then you can run the finished mix
through it for final “tube” treatment and equalization.The dbx 586’s 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 vacuum tube amplification stage is a classic, high plate-voltage design utilizing a pure class A topolo-
gy. 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 586
are hand tested and graded specifically for gain, noise, and microphonics. Precision 1% resistors are used
throughout the audio path to ensure performance stability and low noise. To ensure years of trouble-free
operation, each dbx 586 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 infor-
mation that will assist you in setting up and operating your dbx 586.
• Low noise, pure Class A vacuum tube preamplifier stage
• Single vacuum tube per channel with adjustable Drive and Level controls
• Three band semi-parametric equalization with switchable mid-frequency bandwidth and hardwire EQ
bypass switch
• 75 Hz low cut filter with 12 dB/octave slope
• Ready for optional dbx TYPE IV™ Conversion System digital output module
• XLR and TRS 1/4” balanced inputs and outputs
• Pre EQ insert loop
• Multi-source VU metering and Peak indication
• Switchable 48 Volt phantom power, phase invert, 20 dB gain pad, low-cut filter and input select
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