Loyola Enterprises

A veteran and minority owned SDB Certified Business.


DBX 286A Mic Preamp

757.498.6118 Ext - 109DBX 286A - Call for pricing - Mic Preamp/Processor


PDFDBX 286A Mic Preamp Cut Sheet (pdf)

PDFDBX 286A Mic Preamp Manual (pdf)

The dbx® 286A’s Mic Preamp and Five processors can be used independently or in any combination. Why mic up vocals and instruments through a noisy, blurry mixer? The dbx 286A’s sonically pristine Mic Preamp has all the features you need, including wide-ranging input gain control, switchable 48V phantom power and an 80Hz high-pass filter. Use the 286A’s newly designed and patented OverEasy® Compressor to transparently smooth out uneven acoustic tracks or deliver that classic “in your face” rock vocal. Take out vocal sibilance and high frequency distortion in cymbals with the 286A’s frequency tunable De-Esser. Fine-tune the Enhancer’s HF Detail control to add sparkle and crispness to tracks. LF Detail control adds fullness and depth to vocals and bass instruments while simultaneously cleaning up muddy low midrange frequencies. And, the Expander/Gate’s separate threshold and ratio controls allow you to subtly reduce headphone leakage or radically gate noisy guitar amps.

The dbx® 286A’s full complement of metering and status LEDs visually guide you to achieving the right sound. The floating balanced XLR mic input accepts balanced or unbalanced inputs. An additional 14" TRS phone jack can accept balanced/unbalanced line signals to process live electronic instruments or pre-recorded tracks at mixdown. An insert jack between the 286A’s Mic Preamp and signal processing sections can be used to “loop out” to external processors (such as EQ) or to mix the Mic Preamp’s signal out to an external destination.

The cost and hassle of patching together multiple processors for use on one track can be frustrating. The dbx® 286A gives you all the tools you’ll need in one box, with the shortest signal path to help keep your music sounding clean.


  • New dbx® standard internal power supply
  • Frequency control for De-Esser
  • Expanded meter to show heavy De-Essing
  • Above/Below threshold indicator for gate
  • +48V DC Phantom Power
  • Precision detented controls

Microphone Input
Connector Pin 2 Hot
Type Floating balanced
Impedance 1.75 kΩ
Max. Input Level 0.2 Vrms
Gain Adjustment Range +10 dB to +60 dB
Phantom Power +48 VDC
CMRR >40 dB, typ 55 dB
Line Input
Connector TIP Hot
Type Floating balanced
Impedance (bal./unbal.) 60 kΩ / 30 kΩ
Max. Input Level +21 dBu
Gain Adjustment Range -20 dB to +30 dB
CMRR >40 dB, typ 55 dB
Connector 4" TRS phone
Type Normalled
Max. Input Level (SEND/RETURN) >+21 dBu, >+20 dBm (600 Ω load) / >+21 dBu
Impedance (SEND/RETURN) 100 Ω / >5 kΩ
Noise <-84 dBu, unweighted (20 Hz-20 kHz)
Distortion <0.01% THD, 20 Hz-20 kHz, +10 dBu
Line Output
Connectors 4" TRS phone
Type Balanced/Unbalanced
Impedance (bal./unbal.) 200 Ω / 100 Ω
Max. Input Level >+21 dBu, >+20 dBm (600 Ω load)
Gain Adjustment Range -30 dB to +10 dB
Noise <-80 dBu (typically -85 dBu, unweighted (20 Hz-20 kHz))
Frequency Response 20 Hz to 20 kHz, ±0.5 dB
Distortion <0.08% THD, 20 Hz-20 kHz, +10 dBu, all Processing Controls OFF
Threshold Range -40 dBu to +20 dBu
Threshold Characteristic OverEasy
Compression Ratio >4:1 For input levels beyond 20 dB above threshold
Max. Compression 30 dB
Attack Time Program-dependent; adjustable
Release Time Program-dependent; adjustable
Distortion Typically <0.05% THD, 20 Hz-20 kHz, 15 dB G/R, +10 dBu Output, DENSITY @ 0
Characteristic Wideband gain reduction
Frequency Range 800 Hz to 10 kHz High Pass
Release Time 12 dB/octave program-dependent; approximately 1 ms/dB
HF Detail Characteristic Program-controlled shelving equalizer, approximately 15dB maximum HF boost
LF Detail Characteristic Bell-shaped boost @ 80Hz, bellshaped cut @250Hz, ratio is approximately 2:1
Threshold Range OFF to +15dBu
Expansion Ratio Adjustable 1.5:1 to 10:1
Maximum Depth >50 dB
Attack TIme Program-Dependent, approximately 2ms
Release TIme Program-Dependent, approximately 10mS/dB
Dynamic Range
Dynamic Range Typically 105 dB
Physical and Power
Operating Voltage DO: 120 VAC 60 Hz, 100 VAC 50/60 Hz
EU: 230 VAC 50/60 Hz
Power Requirements 15 Watts
Operating Temp. 0°C to 45°C (32°F to 113°F)
Weight 2.13 kg (4.68 lbs)
Dimensions 4.5 x 14.6 x 48.5 cm (1.75" x 5.75" x 19")
For pricing options and packages, contact us at
757.498.6118 Ext - 109, Or