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Radio Design Labs

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    • RDL TX-8A 4 Ohm / 8 Ohm Input Interface

      RDL TX-8A 4 Ohm / 8 Ohm Input Interface

      The TX-8A is the ideal choice in many applications requiring superior quality transformer coupling between the output of a 4 or 8 Ohm power amplifier and the input of an audio mixer or amplifier. A front-panel LEVEL control allows the output to be adjusted for -10 dBV or +4 dBu over a wide range of amplified power levels. The TX-8A is a single-channel (mono) module featuring barrier block connections for the input and output. A high quality bifilar wound audio transformer couples the audio input...

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      Item #: RDL-TX-8A

      Availability: In Stock

      Our Price: $69.16

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    • RDL ST-PA6 6 W Mono Audio Amplifier - 8 Ohm

      RDL ST-PA6 6 W Mono Audio Amplifier - 8 Ohm

      The ST-PA6 represents the second generation of RDLs breakthrough in the traditional power vs. size ratio. Present technology permits features and performance at the most economical cost ever. The ST-PA6 offers 6 watts of power for a price you would expect to pay for 3 watts. The ST-PA6 features two balanced audio inputs, a gain control, equalization control and an 8 Ohm output. The output is designed to deliver a clean 6 watts RMS into an 8 Ohm speaker. Each input is a balanced bridge, with the...

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      Item #: ST-PA6

      Availability: In Stock

      Our Price: $98.27

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    • RDL RU-MLD4 Microphone / Line Distribution Amplifier - 1x4

      RDL RU-MLD4 Microphone / Line Distribution Amplifier - 1x4

      The RU-MLD4 is a four channel audio distribution amplifier. The input and all four outputs may be connected through the front-panel XLR jacks or on the rear panel detachable terminal blocks. The input accepts either a balanced microphone or line level signal. Each of the four outputs provides either a microphone or line level signal. Both the front-panel XLR connectors and the rear-panel terminals are active at all times. The RU-MLD4 may be rack-mounted with the XLR jacks facing forward, or may...

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      Item #: RU-MLD4

      Availability: In Stock

      Our Price: $267.23

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    • RDL TX-A2D Dual Audio Converter - Balanced to Unbalanced

      RDL TX-A2D Dual Audio Converter - Balanced to Unbalanced

      The TX-A2D is the ideal choice in installations requiring passive isolation and level attenuation between a professional balanced line-level stereo source and consumer equipment unbalanced inputs. The TX-A2D is a complete unbalanced stereo line-level audio output module. The front panel provides a detachable terminal block for connecting each channel of a balanced +4 dBu audio source. The input signals are coupled to two front-panel gold plated phono jacks through studio-quality isolation transformers....

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      Item #: RDL-TX-A2D

      Availability: In Stock

      Our Price: $107.64

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    • RDL DS-TPS3A Active Three-Pair Sender - Twisted Pair Format-A - Stainless - XLR microphone

      RDL DS-TPS3A Active Three-Pair Sender - Twisted Pair Format-A - Stainless - XLR microphone

      The D SERIES-TPS3A modules are three-pair audio sending modules compatible with RDL Format-A twisted pair products. These modules are designed to be mounted in wall boxes, cabinets or other enclosures that allow users to connect audio sources. The -TPS3A models mount in RDL WB-1U and WB-2U wall boxes, or in standard U.S. electrical boxes. The D-TPS3A features a white front-panel laminate with gray lettering that matches RDL Decora©-style remote controls. The DB-TPS3A features a black front-panel...

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      Item #: RDL-DS-TPS3A

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $163.39

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    • RDL TX-TPR3A Active Three-Pair Receiver Twisted Pair Format-A - Balanced Line

      RDL TX-TPR3A Active Three-Pair Receiver Twisted Pair Format-A - Balanced Line

      The TX-TPR3A is a three-pair audio receiving module compatible with RDL Format-A twisted pair products. Three outputs are provided corresponding to the three signal pairs A, B and C. The audio signal received on each pair of the RJ45 INPUT jack feeds the corresponding -10 dBV unbalanced RCA phono jack output and the +4 dBu balanced detachable terminal block output. A studio-quality buffer amplifier feeds the outputs at the correct operating level. The TX-TPR3A features bridging inputs, allowing...

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      Item #: TX-TPR3A

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $146.11

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    • RDL STM-3 High Gain Microphone Preamplifier - 35 to 75 dB Gain

      RDL STM-3 High Gain Microphone Preamplifier - 35 to 75 dB Gain

      The STM-3 is a quality low-noise microphone preamplifier designed for use in surveillance, commercial sound, broadcast, and recording where higher than normal gain is required. The STM-3 is very flexible, with gain adjustment from 45 to 75 dB, two balanced or unbalanced outputs, and available phantom supply input. Its low-distortion and low-noise performance make it the best choice, even when larger preamps could be used. The single-ended supply input range is from 24 to 33 Vdc. Operation from 12...

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      Item #: STM-3

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $165.94

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    • RDL TX-A2 Balanced to Unbalanced Audio Converter Zoom Rooms compatible

      RDL TX-A2 Balanced to Unbalanced Audio Converter Zoom Rooms compatible

      The TX-A2 is the ideal choice in installations requiring passive isolation and level attenuation between a professional balanced line-level mono source and consumer equipment unbalanced inputs. The TX-A2 is a complete unbalanced line-level audio output module. The front panel provides a detachable terminal block for connection of a balanced +4 dBu audio source. The input signal is coupled to two front-panel gold plated RCA jacks through a studio-quality isolation transformer. Each output is coupled...

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      Item #: RDL-TX-A2

      Availability: In Stock

      Our Price: $90.43

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    • RDL ST-VCA3 Voltage Controlled Amplifier

      RDL ST-VCA3 Voltage Controlled Amplifier

      The ST-VCA3 is used in applications requiring smooth audio level control from a remote control panel, potentiometer or dc voltage (0 to 10 V). Installation in series with the audio input of a power amplifier allows remote control of that amplifier's level. For installations where it is preferred to keep the audio localized in the rack, audio controls are extended outside the rack from the ST-VCA3. Many installations benefit from avoiding long-term potentiometer wear from audio running through the...

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      Item #: ST-VCA3

      Availability: In Stock

      Our Price: $122.67

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    • RDL ST-MX3 3 Channel Audio Mixer - Line Input and Output

      RDL ST-MX3 3 Channel Audio Mixer - Line Input and Output

      The ST-MX3 is a line-level mixer module in the STICK-ON Series of products. It provides audio mixing of three line-level inputs with individual input gain adjustments. The line-level output is capable of driving either high or low impedance, balanced or unbalanced loads. The ST-MX3 operates from floating or bipolar DC power. For installations with microphone level inputs, use the ST-UMX3 Universal Audio Mixer. PLEASE NOTE: Required power supply sold separately. Features:...

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      Item #: ST-MX3

      Availability: In Stock

      Our Price: $127.39

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    • RDL ST-LCR1 Logic Controlled Relay - Momentary

      RDL ST-LCR1 Logic Controlled Relay - Momentary

      The ST-LCR1 provides double-pole, double-throw dry switching contacts and LED indicator for relay closure. The ST-LCR1 provides momentary operation and is ideally suited where additional switching contacts are needed to be added to nearly any type of control signal. Features: Add Contacts to Any Control Signal Activation from Logic Circuits DPDT Switching Relay Open-Collector Switching Control from Switch, Button or Logic Circuits

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      Item #: ST-LCR1

      Availability: In Stock

      Our Price: $77.48

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    • RDL RU-MX4 Pro 4 Ch Mic/Line Mixer w/Phantom Power Mic & Line Output

      RDL RU-MX4 Pro 4 Ch Mic/Line Mixer w/Phantom Power Mic & Line Output

      The RU-MX4 is the ideal choice in many applications where a combination of balanced mic and/or unbalanced line-level signals needs to be mixed. Balanced connections use XLR connectors. Unbalanced signals are coupled through phono jacks. Each of the four inputs can accept either a balanced XLR mic or an unbalanced line-level input. 24 V phantom is individually switch selectable for each mic input. The unbalanced phono jack LINE OUTPUT from one RU-MX4 may connect to the unbalanced input of other equipment,...

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      Item #: RU-MX4

      Availability: In Stock

      Our Price: $326.04

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    • RDL HR-ADC1 Analog to Digital Audio Converter

      RDL HR-ADC1 Analog to Digital Audio Converter

      The HR-ADC1 is a broadcast quality A/D converter that provides exceptional audio accuracy and clarity with any audio source or style. Superior analog performance fine tuned through audiophile listening practices produces very low distortion (0.0006%), exceedingly low noise (-135 dB) and remarkably flat frequency response (+/- 0.05 dB). This performance is coupled with unparalleled metering flexibility and programmability with average mastering level monitoring and peak value storage. With external...

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      Item #: HR-ADC1

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $631.79

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    • RDL ST-LCR3 Logic Controlled Relay - Dual Alternate Pulse

      RDL ST-LCR3 Logic Controlled Relay - Dual Alternate Pulse

      The ST-LCR3 is ideally suited to applications where momentary pulses are needed from a single control signal. The module provides a momentary pulse when a logic signal at its input first becomes active. A separate momentary pulse is provided when the logic signal at the module input becomes inactive. Two logic inputs are available on the ST-LCR3. Either of these inputs may be used. Terminal 1 is internally pulled high to +5 Vdc. This input becomes active when an external closure or open-collector...

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      Item #: ST-LCR3

      Availability: In Stock

      Our Price: $126.35

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    • RDL ST-ACR1 Line-Level Audio Controlled Relay - 0.5 to 5 s

      RDL ST-ACR1 Line-Level Audio Controlled Relay - 0.5 to 5 s

      The ST-ACR1 is an Audio Controlled Relay in the STICK-ON series. These products are designed for quick, convenient installation, and reliable operation in a variety of control applications. The ST-ACR1 is designed to switch on line level sources. Two multiturn trimmers are provided. The SENS potentiometer adjusts the audio input sensitivity. A threshold LED facilitates accurate adjustment. The module can be set to trigger on signals between -30 dBu and 0 dBu. The DELAY control sets the time required...

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      Item #: ST-ACR1

      Availability: In Stock

      Our Price: $100.35

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    • RDL RU-MX4L Pro 4-CH. Line Level Mixer Microphone & Line Output

      RDL RU-MX4L Pro 4-CH. Line Level Mixer Microphone & Line Output

      The RDL RU‑MX4L is the ideal choice in many applications where a combination of balanced and/or unbalanced line‑level signals needs to be mixed. Balanced connections use XLR connectors. Unbalanced signals are coupled through phono jacks. Each of the four RU‑MX4L inputs can accept either a balanced XLR line‑level input or an unbalanced line‑level phono jack input. The unbalanced phono jack LINE OUTPUT from one RU‑MX4L may connect to the unbalanced input of other...

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      2 Types Available

      Item #: RU-MX4L

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $281.84

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    • RDL STM-2X Switched Microphone Preamplifier - 35 to 65 dB Gain

      RDL STM-2X Switched Microphone Preamplifier - 35 to 65 dB Gain

      The RDL STM‑2X is the ideal choice in many installations where a microphone preamplifier is required, and is the ideal choice where either a toggle‑type switch or push‑to‑talk switch is to be provided for microphone control, particularly if condenser microphones are used. Features: Quiet Switching of Condenser Microphone Remote Microphone Soft‑Switching Switch a Mic‑Level Source to a Mic or Line Level Output Remote Toggle Switch or Push‑to‑Talk...

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      Item #: STM-2X

      Availability: In Stock

      Our Price: $164.83

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    • RDL TX-70A 25V/ 70V/ 100V Speaker Level Input Interface - Unbalanced Line Output

      RDL TX-70A 25V/ 70V/ 100V Speaker Level Input Interface - Unbalanced Line Output

      Do you ever need to feed the audio from a 70V distributed loud speaker system into a line-level device in a remote location? Do you ever need a few more loudspeakers than your existing 70V amplifier can drive but have no convenient line-level audio to run into a local amplifier? Well RDL has the module for you! The TX-70A 70/25/100 volt input interface matches a 100, 70 or 25 volt speaker line to any unbalanced line level audio input. Simply install the TX-70A as you would a 70V speaker...

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      Item #: TX-70A

      Availability: In Stock

      Our Price: $42.50

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    • RDL ST-UBA2 Unbalanced to Balanced Amplifier - 2 Channel

      RDL ST-UBA2 Unbalanced to Balanced Amplifier - 2 Channel

      The ST-UBA2 is used in any application requiring conversion from unbalanced consumer format signals to professional +4 dBu. It may be used to balance audio from CD players, cassette decks, computer sound cards, televisions, and a wide variety of other unbalanced sources. The mono sum output may be used to drive patch-bay jacks, monitors or subwoofer amplifiers. Separate Dual-LED VU metering is provided for the left and right outputs. A green LED illuminates at 15 dB below +4 dBu. The intensity...

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      Item #: ST-UBA2

      Availability: In Stock

      Our Price: $154.90

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    • RDL ST-LCR2 Logic Controlled Relay - Latching

      RDL ST-LCR2 Logic Controlled Relay - Latching

      The RDL ST‑LCR2 provides double‑pole, double‑throw dry switching contacts and LED indicator for relay closure. The ST‑LCR2 is used where momentary pulses must alternately toggle on/off switching contacts. Open‑collector slave output allows connection of remote on indicator or an ST‑LCR1 for additional relay contacts. Features: Alternate‑Action Switching Add Contacts to Any Control Signal Activation from Logic Circuits DPDT Switching Relay Open‑Collector...

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      Item #: ST-LCR2

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $111.78

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    • RDL ST-SSR1 Line-Level Audio Switch - 2x1

      RDL ST-SSR1 Line-Level Audio Switch - 2x1

      The ST-SSR1 was designed for absolute silent switching of audio signals. It supports two balanced line-level inputs and one balanced output. Each can be used unbalanced as well. The ST-SSR1 is perfect for switching between two input signals or as a silent On/Off switch for a single channel. Performance is in keeping with the technical standards for which RDL has become known. The user can program the module for either fast or soft switching. The SELECT input feeds the OUTPUT when the TRIG terminal...

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      Item #: ST-SSR1

      Availability: In Stock

      Our Price: $108.10

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    • RDL TX-TPS1A Active Single-Pair Sender - Twisted Pair Format-A - Bal Line Input

      RDL TX-TPS1A Active Single-Pair Sender - Twisted Pair Format-A - Bal Line Input

      The TX-TPS1A is a single-pair audio sending module compatible with RDL Format-A twisted pair products. One line-level source may be connected to the module using either the -10 dBV unbalanced RCA phono jack or the +4 dBu balanced detachable terminal block. A studio-quality buffer amplifier feeds the RJ45 OUTPUT at the correct operating level. The TX-TPS1A is a single-pair sender, feeding the input signal to the cable pair set on the front-panel switch during installation. This module drives only...

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      Item #: RDL-TX-TPS1A

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $127.39

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    • RDL TX-1A Balanced to Unbalanced Transformer - Adjustable

      RDL TX-1A Balanced to Unbalanced Transformer - Adjustable

      The RDL TX-1A is used primarily for galvanic isolation and format conversion between equipment. Conversion from -10 dBV consumer level up to +4 dBu professional level requires voltage gain. The transformer in the TX-1A has a 1:1 ratio and uses an adjustable attenuator circuit at its output to lower the output signal to the level required. The module cannot provide voltage gain. RDL offers several premium quality conversion amplifiers to produce professional signals from consumer sources....

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      Item #: TX-1A

      Availability: In Stock

      Our Price: $36.91

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    • RDL AV-HK1 HUM KILLER Stereo Audio Isolation Transformer

      RDL AV-HK1 HUM KILLER Stereo Audio Isolation Transformer

      The AV‑HK1 is a stereo transformer isolation module for use with unbalanced, high impedance audio inputs. Input and output connections are provided on gold‑plated phono jacks. The AV‑HK1 is supplied with two adapter cables to facilitate connecting with products that use mini‑plugs and jacks. The shield connection of each INPUT jack is electrically isolated from the case and from the output ground. The shield connection of each OUTPUT jack is connected to the case shield....

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      Item #: AV-HK1

      Availability: In Stock

      Our Price: $90.98

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    • RDL RU-MX4T Professional 4 Channel Microphone/Line Mixer w/ Phantom Power & Transformer - Mic & line output

      RDL RU-MX4T Professional 4 Channel Microphone/Line Mixer w/ Phantom Power & Transformer - Mic & line output

      The RU-MX4 is the ideal choice in many applications where a combination of balanced mic and/or unbalanced line-level signals needs to be mixed. Balanced connections use XLR connectors. Unbalanced signals are coupled through phono jacks. Each of the four inputs can accept either a balanced XLR mic or an unbalanced line-level input. 24 V phantom is individually switch selectable for each mic input. The unbalanced phono jack LINE OUTPUT from one RU-MX4 may connect to the unbalanced input of other equipment,...

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      Item #: RU-MX4T

      Availability: More on the way, usually ships in 3-10 business days

      Our Price: $345.79

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      The concept of Application-Specific-Modules was first introduced by RDL more than twenty years ago - a concept promoting unsurpassed value and performance. As the inventor of Application-Specific-Modules, RDL continues to lead the industry with their solutions to specific problems as well as building blocks of quality audio/video system designs. Markertek is the largest in-stock source for Radio Design Labs Products.

      Markertek is an authorized dealer for the entire Radio Design Labs line. If you don't see what you're looking for, contact us and we'll do our best to get it for you.

       
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