286s Microphone Pre-Amp Processor


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The dbx 286s is a full featured Channel Strip Processor that delivers a studio quality microphone/instrument preamplifier and four processors that can be used independently or in any combination. Why mic up vocals and instruments through a noisy, blurry mixer? The sonically pristine dbx 286s Mic Preamp has all the features you need, including wide-ranging input gain control, switchable +48V phantom power, and an 80 Hz high-pass filter to remove low frequency hum, rumble or wind. Use the patented dbx OverEasy compressor to transparently smooth out uneven acoustic tracks or deliver that classic "in your face" vocal performance that only a dbx compressor can. Eliminate vocal sibilance and high frequency distortion from instruments such as cymbals with the frequency tunable De-Esser. Fine-tune the Enhancer HF Detail control to add sparkle and crispness to your tracks and make adjustments to the LF Detail control to add fullness and depth to vocals and bass instruments while cleaning up the muddy low midrange frequencies. And, the separate threshold and ratio controls on the Expander/Gate allow you to subtly reduce headphone leakage or radically gate noisy guitar amps.

The dbx 286s offers a full compliment of metering and status LEDs to visually guide you to achieving the right sound. The floating balanced XLR Mic Input accepts balanced or unbalanced inputs to easily connect to professional and home studio microphones. The additional 1/4" TRS Line Input can accept balanced/unbalanced signals to process live electronic instruments or prerecorded tracks at mixdown. Use the Insert jack to interface between the Mic Preamp and the signal processing sections to "loop out" to external processors (such as EQ or delay unit) 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 286s provides you with all the mic processing you need in one box, with the shortest, cleanest signal path to keep your music sounding its best!

• Studio quality Mic Preamp/Channel Strip Processor
• Classic dbx Compression puts great sound within easy reach
• Frequency tunable De-Esser reduces sibilance and high frequency distortion
• Enhancer increases the detail and definition of the high and low frequencies
• Program adaptive Expander/Gate
• Insert jack allows you to add an external processor
• Full compliment of meters and status LEDs
• +48V Phantom Power
• Precision detented controls


Mic Preamp Connector XLR Floating balanced, Pin 2 Hot
Mic Preamp Input Impedance ~4.2 kO
Mic Preamp gain 0 dB to +60 dB
Mic Preamp Phantom Power +48 VDC, applied to XLR pins 2 and 3 through 6.81 kO resistors
CMRR >40 dB, typically 55 dB
Mic Preamp max. input level 0.2 VRMS, Gain = 30 dB
Mic Preamp Equivalent Input Noise (EIN) -125 dBu, 22 Hz - 22 kHz, 150O source impedance
Input Connectors (line) Floating balanced, TIP Hot
Input Impedance (line) 10 kO unbalanced, 20 kO balanced
Max. Input (line) >+21 dBu, balanced or unbalanced
Input Gain Range (line) -15 dB to +45 dB
Insert Connector 1/4" TRS: Normalled; tip is Send, ring is Return
Insert Impedance >5 kO (ring-return); 100O (tip-send)
Insert Max. Level >+21 dBu; >+20 dBm (600O load-tip)
Insert Noise <-84 dBu, unweighted (20 Hz - 20 kHz); LINE GAIN Control set to 0 dB
Insert Distortion <0.01% THD, 20 Hz - 20 kHz, +10 dBu
Output Connectors 1/4" Balanced/Unbalanced TRS Connectors
Output Impedance 100O unbalanced, 200O balanced
Max. Output >+21 dBu, >+20 dBm (600O load)
Gain Adjustment Range -30 dB to +10 dB
Noise <-80 dBu unweighted (20 Hz - 20 kHz); Both Gain Controls set for 0 dB, all processing controls OFF
Frequency Response 20 Hz to 20 kHz, +0.5, -0.5 dB
THD <0.08% THD, 20 Hz - 20 kHz, +10 dBu, all Processing Controls OFF
Compressor Threshold Range -40 dBu to +20 dBu
Compressor Threshold Characteristic OverEasy
Compressor Ratio >4:1 For input levels beyond 20 dB above threshold
Max. Compression 30 dB
Compressor Attack Time Program-Dependent; >1s for small level increases, down to 10 ms for large increases
Compressor Release Time Program-Dependent; adjustable between approximately 1 dB/sec and 75 dB/sec
Compressor Distortion Typically <0.05% THD, 20 Hz - 20 kHz, 15 dB G/R, +10 dBu Output, DENSITY @ 0
IMD SMPTE: <0.05%; 60 Hz/7 kHz 4:1, 15 dB G/R, +10 dBu Output Level, DENSITY @ 0
De-esser Characteristic Wideband Gain Reduction
De-esser Frequency Range 800 Hz to 10 kHz High Pass, 12 dB/octave
De-esser Release Time 12 dB/octave Program-Dependent; approximately 1 mS/dB
Enhancer HF Detail Characteristic Program-controlled shelving equalizer, approximately 15 dB maximum HF boost
Enhancer LF Detail Characteristic Bell-shaped boost @ 80 Hz, bell-shaped cut @250 Hz, ratio is approximately 2:1
Expander/Gate Threshold Range OFF to +15 dBu
Expander/Gate Ratio Adjustable 1.5:1 to 10:1
Expander/Gate Max. Depth >50 dB
Expander/Gate Attack Time Program-Dependent, approximately 2 mS (at maximum attenuation)
Expander/Gate Release Time Program-Dependent, approximately 10 mS/dB
Expander/Gate Dynamic Range Typically 105 dB
Power Consumption 15W
Operating Voltage DO: 120 VAC 60 Hz, 100 VAC 50/60 Hz; EU: 230 VAC 50/60 Hz
Operating Temperature 0°C to 45°C (32°F to 113°F)
Dimensions 1.75" x 5.75" x 19" (4.5 cm x 14.6 cm x 48.5 cm)
Unit Weight 4.5 lb./2.04 kg
Shipping Weight 6.54 lb./2.97 kg
More Information
Weight 6.000000
Length 22
Width 2.5
Height 11.25
Manufacturer dbx by HARMAN
Manufacturer Model Number 286s
Manufacturer Part Number DBX-286SVVM
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