dbx Silver Series Dynamics Processors feature premium grade 12AU7 vacuum tubes behind vented front panels. Series-wide features include Drive and Level controls at the tube stage, so you can control the amount of tube color in the signal, Custom VU meters, gold plated Neutrik XLRs and 1/4 in. TRS jacks, and the optional Type IV Conversion System digital output. The 586 features +48V, Pad, phase invert, low cut switches, insert loop with send level control, and PeakPlus limiter.

Custom designed analog VU meters monitor tube drive, insert, or output levels
dbx has long been known as the leader in signal processing technology, and mic preamps have always been a strong part of that reputation. In keeping with that tradition, dbx shows a new entry into the vacuum tube domain with the 586 Dual Vacuum Tube Preamp. The 586 carries the dbx heritage of past products into the vacuum tube arena. As usual we have left no stone unturned to bring to the 586 all the standard features one could possibly want in a preamp, including custom designed analog VU meters that monitor tube level insert path or output levels, +48V Phantom Power, 20dB pad, phase invert, and low cut filter. Line/Instrument and mic inputs make the 586 versatile enough to use with virtually any source device. Add to this impressive list of standard features extras like a three band EQ with sweepable mids and selectable mid Q (with EQ hardwire bypass), available insert loop, and the new PeakPlus limiting topology and you've got a winner.

All this would be enough, but you have come to expect more from dbx than just "enough", and they deliver the goods with the 586. Hand selected and matched premium 12AU7 vacuum tubes ensure the ideal triode gain matching, distortion, microphonics and drive characteristics. What does all that mean? It means you get the best tube sound with the most versatility available today. Have you ever wanted to go directly from the wonderfully warm sound of tube processing to the digital domain without losing that great sound? Well, now you can. With the optional dbx TYPE IV Conversion System output, you can capture the essence of tube processing directly into the digital world, without leaving the box. The digital output offers the ability to communicate in either AES/EBU or S/PDIF at up to 16 or 20bit word lengths. In addition, TYPE IV offers the ability to select Noise shape algorithms and dither types that best suit your music and your medium. Never before has so much flexibility been offered to digital users. The 586 has all the rear panel versatility and connectivity that make it easy to setup and patch into any system. No custom cables or adapters. Gold plated Neutrik(R) connectors for the audio ins and outs ensure solid connections and pristine sound every time. Separate 1/4 in. connectors for the insert sends and returns, as well as +4/-10 operating level switching make it a
snap.

Features:

Hand selected and matched Premium 12AU7 vacuum tubes in path

Mic or line/instrument inputs on each channel. +4/-10 operation

Drive control for a wide variety of great tube effects

PeakPlus limiting control

3-Band EQ with sweepable frequency, wide / narrow Q and hardwire bypass

Optional TYPE IV Conversion System outputs

Separate 1/4 in. insert sends and returns on each channel
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MICROPHONE INPUTS

Connectors: Female XLR Pin 2 hot
Type: Electronically balanced/unbalanced
Impedance: 1.70 kOhm
Optimum Microphone Impedance: 150 - 200Ohm
Maximum Input Level: > +13 dBu, or +33 dBu with 20 dB pad engaged
CMRR: > 115 dB at 60 Hz, > 110 dB at 1 kHz, > 75dB at 10 kHz
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LINE INPUTS

Connectors: Female XLR Pin 2 hot and TRS 1/4"
Type: Electronically balanced/unbalanced
Impedance: 20.1 kOhm nominal, or 470 kOhm with rear-panel INST switch engaged
Maximum Input Level: > +30 dBu, or +22 dBu with rear-panel INST switch engaged
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OUTPUTS

Connectors: Male XLR Pin 2 hot and TRS 1/4"
Type: Servo-balanced/unbalanced, RF filtered
Impedance: Balanced 120Ohm, unbalanced 60 Ohm
Maximum Output Level: +21.5 dBu, balanced or unbalanced
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INSERT

Connectors: TRS 1/4"
Type: Impedance balanced/unbalanced (SEND), electronically balanced/unbalanced (RETURN)
Impedance: 100Ohm bal./50Ohm unbal. (SEND), 20k (RETURN)
Nominal Send Level: +4 dBu
Nominal Return Level: +4 dBu
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SYSTEM PERFORMANCE

DRIVE Control Range: +10 dB to +60 dB
LEVEL Control Range: -15 dB to +15 dB
0.5 dB Bandwidth: 15 Hz to > 90 kHz +0/-0.5 dB
Frequency Response: <10 Hz to >200 kHz +0/-3.0 dB
EIN: Typically -126 dBu, 150 source impedance, unweighted, 20 Hz to 20 kHz measurement bandwidth
THD + Noise: 0.04% typical at +0 dBu out, 1kHz, 33 dB gain 3.5% typical at +21 dBu out, 1kHz, 35 dB gain
Deviation From Linear Phase: < 20 degrees, 20 Hz to 20 kHz.
Interchannel Crosstalk: Typically -98 dB, 20 Hz to 20 kHz.
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EQUALIZER

LOW Frequency: 80 Hz, shelving filter
HIGH Frequency: 12 kHz, shelving filter
MID Frequency: Sweepable from 100 Hz to 8 kHz, bandwidth 1.5 octaves (WIDE) or 0.5 octaves (NARROW)
Gain (all bands): Sweepable from -15 to +15 dB.

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PeakPlus LIMITER

Type: Two-stage proprietary
Threshold Range: 0 dBu to + 22 dBu (off)
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FUNCTION SWITCHES

INSERT: Inserts a device connected to the rear-panel Return jack into the signal path.
NARROW: Selects narrow (0.5 octave) bandwidth for the MID frequency control
EQ: Enables the equalizer section
LINE: Selects the Line inputs
+48V: Enables the 48V phantom power for the Microphone input
PAD: Attenuates the input signal by 20 dB.
PHASE: Reverses pins 2 and 3 of the input XLR connector.
LO CUT: Enables the 75 Hz, 12 dB/octave low cut filter
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METER SOURCE SWITCHES



More info:
https://dbxpro.com/en/product_documents/586cutsheetpdf
https://dbxpro.com/en/product_documents/586manualpdf