STICK-ON® SERIES
Model STM-DA3
Mic Level Distribution Amplifier
ANYWHERE YOU NEED...
• To Feed 1 Microphone to 3 Mic Inputs
• Electrical and Audio Isolation
• Ultra Low-Noise
• Ultra Low-Distortion
• Excellent Phase Response
• Versatility of STICK-ON Compactness
• RDL’s Exclusive Dual LED VU Metering
You Need STM-DA3!
The STM-DA3 is part of the group of versatile STICK-ON products from Radio Design Labs. STICK-ONs
feature the advanced circuitry for which RDL products are known, combined with unequalled versatility in
mounting possibilities. The durable adhesives provided with the STM-DA3 permit permanent or removable
mounting. Numerous available mounting accessories, brackets and rack-mount chassis are optionally
available to facilitate any system design.
APPLICATION: The STM-DA3 is designed for use in quality commercial sound, broadcast and recording
applications. The 1200 Ω balanced input accepts a wide variety of microphone input levels without loading
professional low-impedance microphones. A multi-turn trimpot is user adjustable for either gain or loss in
order to match the facility standard microphone levels. Three balanced outputs provide nearly total isolation
between the output lines. Unlike mic-splitting transformer systems, the STM-DA3 also provides audio
isolation. In fact, the audio isolation is so good that a +4 dBu signal fed into one output is still below the
noise floor on the adjacent output. Loading of one output, including a direct short, has no effect on the other
outputs.
The STM-DA3 is built on the electrical architecture of RDL’s low-noise studio-quality mic preamplifiers.
Dynamic or condenser microphones may be used with the STM-DA3. Standard 24V phantom is supplied to
the input when the supply voltage is connected to the PHM terminal. Optimum operating level is set using
RDL’s unique dual LED VU meter, located adjacent to the terminal block. A green LED illuminates at 15 dB
below optimum level. The intensity of the green LED progresses from minimum to full intensity over a 15 dB
range. The adjacent red LED illuminates when the operating level exceeds the optimum level. This makes
the STM-DA3 easy to set up without any external test equipment, and operating levels may be monitored at
the module.
Wherever a microphone distribution amplifier is needed, the STM-DA3 is the ideal choice. Use the
STM-DA3 combined with other RDL products as part of a complete audio/video system.
RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• (805) 684-5415 •• FAX (805) 684-9316 •• http://www.rdlnet.com
STICK-ON® SERIES
Model STM-DA3
Mic Level Distribution Amplifier
STUDIO QUALITY MICROPHONE
DISTRIBUTION AMPLIFIER
G
INPUT PHM PWR A C
A
I
N
SIGNAL
FROM
BALANCED
MIC-LEVEL
SOURCE
STUDIO QUALITY MICROPHONE
DISTRIBUTION AMPLIFIER
G
A
I
N
PHM PWR A C
INPUT
SIGNAL
FEEDING
BALANCED
MIC-LEVEL
EQUIPMENT
OUTPUTS
B
OUTPUTS
B
L
E
V
E
L
OTHER
BALANCED
OR UNBAL
OUTPUTS
L
E
V
E
L
ADJUSTMENT
SUPPLY
AUDIO
WIRING
25 TURN
GAIN SET
WIRING
Installation/Operation
EN55103-1 E1-E5; EN55103-2 E1-E4
Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.
STUDIO QUALITY MICROPHONE
DISTRIBUTION AMPLIFIER
G
INPUT PHM PWR A C
A
I
N
SIGNAL
FROM
UNBALANCED
MIC-LEVEL
SOURCE
STUDIO QUALITY MICROPHONE
DISTRIBUTION AMPLIFIER
G
A
I
N
PHM PWR A C
INPUT
OUTPUTS
B
SIGNAL
FEEDING
UNBALANCED
MIC-LEVEL
EQUIPMENT
OUTPUTS
B
BALANCED
OR UNBAL
OUTPUTS
OTHER
L
E
V
E
L
L
E
V
E
L
OPTIONAL JUMPER
TO PROVIDE PHANTOM
POWER TO CONDENSER
MICROPHONES
24 VDC
SOURCE
RDL PS-24
TYPEPOWER
SUPPLY
(24 V PHANTOM)
24 VDC
POWER
SOURCE
TYPICAL PHANTOM
CONNECTION
TYPICAL PERFORMANCE
Input: 1200 Ω balanced
Outputs (3): -45 dBu, 150 Ω balanced
Gain Range: 17 dB, 10-turn trimmer adjustable:
Control fully CCW: Gain = -5 dB
Control fully CW: Gain = 12 dB
Frequency Response: 30 Hz to 20 kHz (+/- 0.2 dB)
THD: < 0.1%
IMD: < 0.1%
Noise: <80 dB (below -50 dBu output, -45 dBu input)
Headroom: > 20 dB (-50 dBu output, -50 dBu input)
CMRR: > 60 dB (100 Hz to 5 kHz)
Output Isolation: > 135 dB (balanced audio), > 150 dB (common mode)
Power Requirement: 24 - 33 Vdc @ 40 mA, Ground-referenced
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
891-1090
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
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