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A Harman International Company
FOR MORE INFORMATION CONTACT:
dbx Professional Products • 8760 S. Sandy Pkwy. • Sandy, Utah 84070
Phone (801) 568-7660 • Fax (801) 568-7662 • Int’l Fax (801) 568-7583
customer@dbxpro.com • http://www.dbxpro.com
The microphone processor shall have one channel
with an audio frequency response of 20Hz —
20kHz +0.5, -0.5dB, an electronically floating bal-
anced XLR microphone input with an impedance
of not less than 1.5kΩ and with a maximum input
level of not less than 0.2Vrms. The unit shall also
have an electronically floating balanced 1⁄4" TRS
line level input with an impedance of not less than
20kΩ and with a maximum input level of +21dBu.
The impedance of the unbalanced 1⁄4" TRS output
shall be no more than 100Ω with a maximum out-
put level of not less than +21dBu. Total harmonic
distortion shall typically be no more than 0.08% in
operation with all processing controls set to Off.
Dynamic range shall typically be 105dB with pro-
cessing engaged. Output level shall be adjustable
from -30dB to +l0dB via a front panel gain control.
A1⁄4" TRS insert jack with an input impedance of
not less than 5kΩ and maximum level of not less
than +21dBu and an output impedance of not more
than 100Ω and a maximum output level of not less
than +21dBu shall be accessible at the rear panel.
The insert shall be positioned in the signal path
between the output of the mic preamplifier and the
input to the processing section. The unit will pro-
vide up to six signal processing functions simulta-
neously, including: preamplification, compression,
de-essing, high spectral enhancement, low spectral enhancement and downward expansion/gating. The compression circuitry shall employ a hybrid
feed-back, feed-forward design and a soft knee compression curve. The microphone processor shall have a gain control ranging from +l0dB to +60dB
for Mic In and -20dB to +30dB for Line In, a phantom power switch which activates the +48VDC phantom power circuit, a High Pass Filter switch
which activates a third order high pass filter with a 3dB corner frequency of 80Hz and a Process Bypass switch, which bypasses any subsequent dynam-
ics processing in the unit. The processing section shall contain the following controls: Compressor Drive, Compressor Density, De-Esser Frequency,
De-Esser Threshold, LF Detail, HF Detail, Expander/ Gate Threshold, Expansion Ratio and Output Gain. The following LEDs for metering and sta-
tus indication shall exist on the unit: Input Level (3 LEDS), Input Clip, Phantom Power, High Pass Filter, Process Bypass, Compressor Gain Reduction
(8 LEDs), De-esser (2 LEDs), Expander/Gate Threshold (2 LEDs), Output Clip. The power requirement shall be 100VAC 50/60Hz, 120VAC 60Hz for
domestic or 230VAC 50/60Hz for Europe. Dimensions shall be 1.75" x 19" x 4" (4.45cm x 48 .2cm x 10.16cm), The net weight shall be 4.68 lbs/2.13
Kgs and the shipping weight shall be 6.54 lbs/2.97 Kgs. The unit shall be a dbx 286A Mic Preamp/Processor.
dbx engineers are constantly working to improve the quality of our products. Specifications are, therefore subject to change without notice.
MIC PREAMP / PROCESSOR
286A
286A
Mic Preamp/
Processor
-20 -10
LEVEL (dBu)
48V
PHANTOM
POWER
HIGHPASS
(80Hz)
PROCESS
BYPASS
0 CLIP 30 25
GAIN REDUCTION dB
20 15 12
dB
16963
COMPRESSOR DE-ESSER ENHANCER
GAIN
dB
+10
+15 +40
+30
+60
DRIVE
OFF
1
2
3
46
7
8
9
5
10
DENSITY
OFF
1
2
3
46
7
8
9
5
10
THRESHOLD
OFF
1
2
3
46
7
8
9
5
10
LF DETAIL
OFF
1
2
3
46
7
8
9
5
10
HF DETAIL
OFF
1
2
3
46
7
8
9
5
10
FREQUENCY
Hz
800
1k 8k
4k
10k
THRESHOLD
dBu
OFF
-30 -5
-15
+15
EXPANDER/GATE
RATIO
MIN
1.5:1 5:1
2:1
10:1
GAIN
dB
-30
-10 +5
0
+10
THRESHOLD
- CLIP+
OUTPUT
MIC PREAMP
85-2575-X3 286A buyoff (1-14-98)
#85-3688-A 286A REAR ART (10-16-96)
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
MODEL 286A
MIC PREAMP/PROCESSOR
OUTPUT MIC INPUTLINE INPUTINSERT
TIP = SEND (286A PREAMP OUT TO EFFECTS)
TIP = OUT (286A PREAMP OUT)
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING
U.S. PATENTS:4,234,804 4,316,107 4,329,598 4,331,931 4,403,199
4,409,500 4,425,551 4,434,380 4,454,433 4,471,324 4,473,793 5,444,788
RING = RETURN (FROM EFFECTS TO 286A)
FOR USE AS AN EFFECTS LOOP
INSERT
STEREO
PLUG
286A PREAMP OUT (MULT)
MONO
PLUG
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION:
RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
TIP = PIN 2 = +
RING = PIN 3 = -
SLEEVE = PIN 1 =
15 WATTS
100V 50/60Hz
120V 60Hz
MIC INPUT
Impedance
Maximum Level
Gain Adjustment Range
Phantom Power
CMRR
LINE INPUT
Impedance
Maximum Level
Gain Adjustment Range
CMRR
INSERT(4” TRS phone)
Ring :Impedance
Maximum Level
Tip: Impedance
Maximum Level
Noise
Distortion
LINE OUTPUT (4” TRS phone)
Impedance
Maximum Level
Gain Adjustment Range
Noise
Frequency Response
Distortion
COMPRESSOR
Threshold Range
Threshold Characteristics
Compression Ratio
Maximum Compression
Attack Time
Release Time
Distortion
DE-ESSER
Characteristic
Frequency Range
Release Time
ENHANCER
HF Detail Characteristic
LF detail Characteristic
EXPANDER/GATE
Threshold Range
Expansion Ratio
Maximum Depth
Attack TIme
Release TIme
DYNAMIC RANGE
Power Requirements
Operating Voltage
Operating Temperature
Dimensions
Weight
Floating balanced, Pin 2 Hot
1.75kΩ
0.2Vrms
+10dB to +60dB
+48VDC
>40dB, typically 55dB
Floating balanced, TIP Hot
30kΩ unbalanced, 60kΩ balanced
>+21dBu, balanced or unbalanced
-20dB to +30 dB
>40dB, typically 55dB
Normalled; tip is Send, ring is Return
>5kΩ
>+21dBu
100Ω
>+21dBu, >+20dBm (600Ω load)
<-84dBu, unweighted (20Hz-20kHz);
<0.01% THD, 20Hz-20kHz, +10dBu
Balanced/Unbalanced
100Ω unbalanced, 200Ω balanced
>+21dBu, >+20dBm (600Ω load)
-30dB to +10dB
<-80dBu (typically -85dBu, unweight-
ed (20Hz-20kHz);
20Hz to 20kHz, +0.5, -0.5dB
<0.08%THD, 20Hz-20kHz, +10dBu,
all Processing Controls OFF
-40dBu to +20dBu
OverEasy®
>4:1 For input levels beyond 20dB
above threshold
30dB
Program-Dependent; adjustable
Program-Dependent; adjustable
Typically <0.05%THD, 20Hz-
20kHz, 15dB G/R, +10dBu
Output, DENSITY @ 0
WIdeband Gain Reduction
800Hz to 10kHz High Pass,
12dB/octave Program-
Dependent; approximately
1mS/dB
Program-controlled shelving
equalizer, approximately 15dB
maximum HF boost
Bell-shaped boost @ 80Hz, bell-
shaped cut @250Hz, ratio is
approximately 2:1
OFF to +15dBu
Adjustable 1.5:1 to 10:1
>50dB
Program-Dependent, approxi-
mately 2mS
Program-Dependent, approxi-
amtely 10mS/dB
Typically 105dB
15 Watts
DO: 120VAC 60Hz, 100VAC
50/60Hz; EU: 230VAC 50/60Hz
0°C to 45°C (32°F to 113°F)
1.75" x 5.75" x 19" (4.5cm x
14.6cm x 48.5cm)
Net Weight: 4.68 lbs/2.13 Kgs
Shipping Weight: 6.54 lbs/2.97
Kgs