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STICK-ON® SERIES
Model STM-2
Mic to Line Level Preamplifier
ANYWHERE YOU NEED...
• Low-Noise Mic Preamp
• Adjustable Output Levels
• High or Low Impedance Mic Inputs
• To Convert Line Inputs to Mic Inputs
• Two Balanced or Unbalanced Outputs
• Separate Phantom Supply Input
• RF Filtered Inputs and Outputs
• Low Distortion Performance
You Need The STM-2!
The STM-2 is part of the group of STICK-ON products from Radio Design Labs. The STM-2 is a quality
microphone preamplifier designed for use in commercial sound, broadcast, and recording applications.
The STM-2 is very flexible with gain adjustment from 0 to 65 dB, two balanced or unbalanced outputs, and
available phantom supply input! Its compact size makes it ideally suited to locations were a larger or
heavier preamp cannot be used. Its performance makes it the best choice, even when larger preamps
could be used! The single-ended supply input makes STM-2 the ideal choice for both permanent and
mobile equipment installations. Some features of the STM-2 are:
• Balanced microphone input accepts impedances from 150 to 600 Ω
• Input circuitry permits connection of unbalanced microphones, or 4 or 8 Ω speakers in intercom or
monitoring applications
• Variable gain (up to 65 dB) and ample headroom allow operation with any mic
• Phantom supply input terminals allow connection of external power when STM-2 is used with phantom
powered microphones
• Supply input is single-ended and operates from 24 Vdc to 33 Vdc (12 Vdc at reduced headroom)
• Two separate outputs are provided for balanced operation
• No lugs required for reliable connections
• Convenience of STICK-ON package yields quick, efficient installation
• Use STM-2 in conjunction with other RDL STICK-ONs to make complete audio systems
Anywhere you need an adjustable mic to line preamplifier, STM-2 is the reliable and cost-effective
solution!
RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• (805) 684-5415 •• FAX (805) 684-9316 •• http://www.rdlnet.com
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STICK-ON® SERIES
Model STM-2
Mic to Line Level Preamplifier
ALTERNATE INPUTS
INPUT PHNTM
SPEAKER
SIGNAL
FROM
USED AS
MIC
UNBALANCED
MIC-LEVEL
SOURCE
EACH OUTPUT MAY BE BALANCED OR UNBALANCED
PROFESSIONAL ADJUSTABLE
MICROPHONE PREAMPLIFIER
G
A
I
N
PHNTMINPUT
OUTPUTS
PWR
PHNTMINPUT
PBA
O
W
E
R
AUDIO
WIRING
25 TURN
GAIN
ADJUST
POWER
WIRING
OR
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.
PROFESSIONAL ADJUSTABLE
INPUT PHNTM
G
A
I
N
SIGNAL
FROM
BALANCED
MIC-LEVEL
SOURCE
G
A
I
N
MICROPHONE PREAMPLIFIER
UNBALANCED
LINE-LEVEL
EQUIPMENT
PROFESSIONAL ADJUSTABLE
MICROPHONE PREAMPLIFIER
PHNTMINPUT
OUTPUTS
A B P
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
OUTPUTS
PWR
SIGNAL
FEEDING
PWR
O
W
E
R
PBA
O
W
E
R
OPTIONAL JUMPER
BATTERY
-+
OR EXTERNAL
PHANTOM
SUPPLY
(UP TO 48V)
NOTE THE STM-2 WILL OPERATE (WITH REDUCED HEADROOM) ON
SUPPLY VOLTAGES FROM 9 VDC TO 23 VDC.
24 VDC
POWER
SOURCE
TO PROVIDE PHANTOM
VOLTAGE TO CONDENSER
MIC WHICH CAN USE UP
TO 32 VOLTS PHANTOM
IS COMMON
THIS
TERMINAL
GROUND
24 VDC
POWER
SOURCE
TYPICAL PERFORMANCE
Input Impedance: 150 to 600 Ω balanced; 5 kΩ unbalanced
Output Impedance: 150 Ω balanced to drive balanced or unbalanced lines of 150 Ω or higher
Output Levels: +4 dBu balanced
Frequency Response: 50 Hz to 25 kHz (+/- 1 dB)
Gain: Adjustable 0 to 65 dB
THD+N: < 0.050%
CMRR: > 60 dB (50 Hz to 30 kHz)
Headroom: > 20 dB (24 Vdc supply); 14 dB (12 Vdc supply)
Power Requirement: 24 to 33 Vdc @ 25 mA, Ground-referenced
(9 to 23 Vdc with reduced headroom)
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
891-0015H
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
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