UniTools
®
are phantom-powered in-line
microphone accessories that can be used to
combine a channel, gate an input, roll off the
response, add a switch, notch out a frequency
or pad down a signal. Compact, economical
and easy to use, they provide outstanding,
reliable performance that would otherwise
require a fully-equipped accessory rack.
Available in six function-specific models,
UniTools are intended primarily for use with
UniPoint
®
and similar condenser micro-
phones. All have professional XLR-type
input/output connectors, and require
balanced cables and 24-48V DC phantom
power for operation. (“In” and “Out” mark-
ings refer to the
mic audio
.) All units permit
phantom voltage to pass on to the micro-
phone. Featuring rugged steel housings,
UniTools can be installed anywhere in-line,
either at the mixer input or near the mic.
AT8681 UniMix
®
AT8684 UniMute
®
AT8682 UniGate
®
AT8685 UniTrap
®
AT8683 UniSteep
®
AT8686 UniLim
®
PHANTOM-POWERED IN-LINE
MICROPHONE ACCESSORIES
UniTools
®
GENERAL SPECIFICATIONS
†
INPUT/OUTPUT CONNECTORS XLRF/XLRM-type
PHANTOM POWER 24-48V DC, 2-4 mA typical
FREQUENCY RESPONSE 20-20,000 Hz
GAIN Unity (0 dB), +0/–1.5 dB
NOISE (A-WEIGHTED) –115 dBV typical
WEIGHT 8.8 oz (250 grams) typical
DIMENSIONS 5.12" (130.0 mm) W x 2.36" (60.0 mm) D
x 1.73" (44.0 mm) H typical
†
Measured at 48V phantom power, 150 ohms input load
and 100,000 ohms output load. Specifications apply to
all models except as noted below.
AT8681 UniMix
®
2-to-1 Mic Combiner with Balance Control
AT8682 UniGate
®
Voice-operated Switch with Adjustable Threshold
AT8683 UniSteep
®
80 Hz Mic Hi-pass Filter
AT8681 SPECIFICATIONS
INPUT IMPEDANCE 10,000 ohms
OUTPUT IMPEDANCE 250 ohms
MAXIMUM INPUT LEVEL +15 dBV (1% T.H.D. at 1 kHz)
MAXIMUM ATTENUATION 33 dB at 1 kHz
Description: The AT8681 combines the output from
two microphones into one channel. The balance
control attenuates each microphone by 6 dB (typical)
at midpoint.
Operation: To connect the UniMix, plug two micro-
phones into the XLRF-type input connectors (marked
“In”). Then run a cable from the unit’s XLRM-type
output connector (marked “Out”) to the mixer input.
Adjust the Balance control until the output of the
UniMix is equal for both microphones.
AT8682 SPECIFICATIONS
INPUT IMPEDANCE 2,500 ohms
OUTPUT IMPEDANCE 460 ohms
MAXIMUM INPUT LEVEL +6 dBV (1% T.H.D. at 1 kHz)
FREQUENCY RESPONSE 25-20,000 Hz
GATE ATTENUATION 10 dB typical
MINIMUM THRESHOLD –85 dBV
Description: The AT8683 provides a steep low-
frequency attenuation to improve the quality of
sound pickup under difficult conditions without
affecting voice quality. Useful for minimizing back-
ground ambience, air conditioning rumble, mechani-
cal noise and other undesired low-frequency sounds.
Operation: To connect the UniSteep, plug the micro-
phone cable into the XLRF-type input connector
(marked “In”). Then run a cable from the unit’s
XLRM-type output connector (marked “Out”) to the
mixer input.
AT8683 SPECIFICATIONS
INPUT IMPEDANCE 2,100 ohms
OUTPUT IMPEDANCE 150 ohms
MAXIMUM INPUT LEVEL +3 dBV (1% T.H.D. at 1 kHz)
FREQUENCY RESPONSE 80-20,000 Hz
CORNER FREQUENCY 80 Hz
LOW-FREQUENCY ROLL-OFF 18 dB/octave
Description: The AT8682 automatically attenuates a
channel by 10 dB (typical) when microphone is not in
use. LED indicates when gate is open.
Operation: To connect the UniGate, plug the micro-
phone cable into the XLRF-type input connector
(marked “In”). Then run a cable from the unit’s
XLRM-type output connector (marked “Out”) to the
mixer input.
The Threshold control sets the reference level that
must be exceeded for a microphone to be consid-
ered “in use.” Adjust to keep background noise level
from triggering the microphone.
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