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RDL STM-1 Microphone Preamplifier

BH #RDSTM1 • MFR #STM-1
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RDL STM-1 Microphone Preamplifier
Key Features
  • High or Low Impedance Input Mic Preamp
  • Fixed 50 dB Gain for Consistency
  • Balanced or Unbalanced Output
  • +24V Phantom Power
The STM-1 is a low-cost, high-quality miniature wall and surface mount microphone preamplifier from RDL, designed for use in commercial sound and broadcast applications. The compact size makes it ideal where a larger or heavier preamp cannot be used.

The high-performance circuit provides a fixed 50dB gain to bring any microphone-level signal up to the line-level range of nearly any line input. The STM-1 supply input is single ended and operates from 24 to 33VDC. Operation from 12VDC is possible with a 6dB reduction in headroom. For intercom applications, the input will operate directly from a speaker.

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RDL STM-1 Overview

The STM-1 is a low-cost, high-quality miniature wall and surface mount microphone preamplifier from RDL, designed for use in commercial sound and broadcast applications. The compact size makes it ideal where a larger or heavier preamp cannot be used.

The high-performance circuit provides a fixed 50dB gain to bring any microphone-level signal up to the line-level range of nearly any line input. The STM-1 supply input is single ended and operates from 24 to 33VDC. Operation from 12VDC is possible with a 6dB reduction in headroom. For intercom applications, the input will operate directly from a speaker.

Wall-mount high or low impedance input microphone preamplifier
Fixed 50dB gain for consistency
Balanced or unbalanced output
Phantom power capability
RF-filtered inputs and outputs
STICK-ON convenience
UPC: 813721011046

RDL STM-1 Specs

Number of Channels
Single
Inputs
Terminal block
Output
Terminal block, balanced or unbalanced
Phantom Power
Input terminals provided
Multi Function
No
Gain Range
50dB nominal
Maximum Output Level
>20dB with 24VDC supply
Frequency Response
50Hz to 30kHz, +/-1dB
Noise
<-75dB below +4dBu, 600 Ω source
Dimensions
Not specified by manufacturer
Weight
Not specified by manufacturer
Specialties
Requires ground-referenced, 24 to 33Vdc @ 25mA power source
Packaging Info
Package Weight
0.2 lb
Box Dimensions (LxWxH)
4.1 x 2.05 x 2"

RDL STM-1 Reviews

Arrived quickly and packaged perfectly

By John
Rated 5 out of 5
Date: 2021-08-10

This item arrived exactly on time, as it was projected to. Likewise, it was packaged with extreme care to defer damage in transit.

nice size, works well

By Bret
Rated 5 out of 5
Date: 2017-03-06

I have used these in the past, and are really nice to use where space is a consideration, but even when space is not a consideration this is an item that I would still consider using. The RDL Website has information about using this preamp, so I would suggest visiting their Website if you have never used this before.

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