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Radio Design Labs

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    • RDL ST-VP2 Automatic Ducking Module

      RDL ST-VP2 Automatic Ducking Module

      The ST‑VP2 can be wired into any line‑level input of a paging amplifier. A line‑level music source may be provided from a receiver, satellite decoder, tape or CD source. A line‑level voice source may be provided from a telephone paging system at line level, or from a microphone which has been preamplified up to line level (See RDL STM‑1, STM‑2, STM‑2X, STM‑3, STM‑LDA3 Microphone Preamplifiers). When a page is initiated, the module automatically...

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      Item #: ST-VP2

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

      Our Price: $160.11

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

      Our Price: $100.35

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    • RDL TX-J2 Unbalanced Input Transformer

      RDL TX-J2 Unbalanced Input Transformer

      The RDL TX-J2 Unbalanced Input Transformer is part of Radio Design Labs TX Series and features unbalanced stereo inputs to summed balanced mono output. TX Series modules are application-specific modules for the A/V and related industries. Many TX modules offer galvanic transformer isolation. Module functions include signal detection, switching, amplification, format conversion, line driving, mixing, distribution, twisted-pair sending/receiving and more. Each TX is a compact module...

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      Item #: TX-J2

      Availability: In Stock

      Our Price: $59.79

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    • Radio Design Labs RU-ADA4D 4 Channel Stereo Audio Distribution Amplifier

      Radio Design Labs RU-ADA4D 4 Channel Stereo Audio Distribution Amplifier

      The RU-ADA4D is a four channel stereo audio distribution amplifier with input and output gain adjustments and input level metering. The module may be operated in mono to provide up to eight distributed mono signals. The inputs and outputs are connected on rear-panel detachable terminal blocks. Each of the two line level inputs accepts either a balanced or an unbalanced signal. Each input is equipped with a front panel INPUT GAIN trimmer. Input signal levels between -14 dBV unbalanced and +9 dBu...

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      Item #: RDL-RU-ADA4D

      Availability: In Stock

      Our Price: $241.49

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    • RDL ST-UMX3 3x1 Universal Audio Mixer - 3 Mic or Line Inputs x 1 Mic or Line Out

      RDL ST-UMX3 3x1 Universal Audio Mixer - 3 Mic or Line Inputs x 1 Mic or Line Out

      The ST-UMX3 is a three-channel audio mixer for combining mic-level or line-level signals to a single output. A MIC/LINE switch is provided for each input. A separate MIC/ LINE switch selects the output level. Each input features a separate preamplifier circuit, which isolates it from the other inputs. An audio taper single turn gain adjustment is provided for each of the three input preamps. Signals from the three preamps are actively summed and fed to the output amplifier which includes an RDL...

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      Item #: ST-UMX3

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

      Our Price: $137.80

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    • RDL STA-2A Dual High Gain Line Amplifiers

      RDL STA-2A Dual High Gain Line Amplifiers

      The STA‑2A is a dual‑channel, line‑level audio preamplifier. Each channel is identical. The audio inputs are bridged at 20 kΩ and accept either an unbalanced or a balanced audio signal. Gain is adjustable from unity to +24 dB using a 25‑turn precision audio taper trimming potentiometer. The output line driver circuits are designed to drive long balanced audio lines into 600 Ω loads. The STA‑2A features wideband circuitry for excellent phase response, low...

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      Item #: STA-2A

      Availability: In Stock

      Our Price: $151.06

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    • RDL RU-AFC2 Stereo Audio Format Converter

      RDL RU-AFC2 Stereo Audio Format Converter

      The RU-AFC2 is a stereo bidirectional audio format converter. The bidirectional format allows the RU-AFC2 to fully convert the stereo input and stereo output of a consumer audio product to professional balanced standards. It can equally convert the stereo input and stereo output of a professional audio product to consumer unbalanced standards. The audio fidelity, low noise, low distortion and excellent crosstalk performance of the RU-AFC2 are ideally suited to the most critical applications. The...

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      Item #: RDL-RU-AFC2

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

      Our Price: $302.58

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    • RDL EZ-MX4L 4x1 Stereo Line-Level Audio Mixer

      RDL EZ-MX4L 4x1 Stereo Line-Level Audio Mixer

      The EZ series offers unparalleled flexibility. Each unit is fully labeled on the front and rear for use either as a finished product or as a utility module. Installation of multiple products is quick and easy using the comprehensive range of EZ rack mounts, chassis, bezels, drawers and accessories. High quality full-size switches, long life controls, quality connectors, solid-state audio and video switching, gold plating and superior engineering combine to make EZ the best value in the industry....

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      Item #: EZ-MX4L

      Availability: In Stock

      Our Price: $159.07

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    • RDL TX-AFC1F Balanced to Unbalanced Audio Transformer - XLR / RCA

      RDL TX-AFC1F Balanced to Unbalanced Audio Transformer - XLR / RCA

      The Radio Design Labs TX-AFC1F is a studio quality balanced to unbalanced audio transformer. It takes an XLR input and transforms it to RCA by means of a studio quality bifilar audio transformer. Conveniently mounts almost anywhere because of its compact housing. The TX-AFC1F is a single-channel (mono) module featuring a female XLR input and phono jack output. A studio quality audio transformer converts the audio input to unbalanced. An integral pad is set to produce an output level of -10 dBV...

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      Item #: TX-AFC1F

      Availability: In Stock

      Our Price: $96.19

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    • RDL EZ-HDA6 1x6 Stereo Headphone Distribution Amp - Rear-Panel Outputs

      RDL EZ-HDA6 1x6 Stereo Headphone Distribution Amp - Rear-Panel Outputs

      The EZ series offers unparalleled flexibility. Each unit is fully labeled on the front and rear for use either as a finished product or as a utility module. Installation of multiple products is quick and easy using the comprehensive range of EZ rack mounts, chassis, bezels, drawers and accessories. High quality full-size switches, long life controls, quality connectors, solid-state audio and video switching, gold plating and superior engineering combine to make EZ the best value in the industry....

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      Item #: EZ-HDA6

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

      Our Price: $179.86

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    • RDL DD-BTN44 Wall-Mounted Bi-Directional Line-Level and Bluetooth Audio Dante Interface (White)

      RDL DD-BTN44 Wall-Mounted Bi-Directional Line-Level and Bluetooth Audio Dante Interface (White)

      The RDL D SERIES-BTN44 modules (DD-BTN44) are Dante networked, wall-mounted audio interfaces that include bidirectional Bluetooth audio, unbalanced analog stereo or mono audio inputs and outputs, and a balanced or unbalanced line-level output. Stereo audio from a compatible Bluetooth-enabled device feeds two Dante network audio channels. Stereo audio connected to a front-panel Mini-Jack or L and R RCA jacks feeds two other Dante network audio channels. Stereo audio is available to users...

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      Item #: RDL-DD-BTN44

      Availability: In Stock

      Our Price: $685.00

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    • RDL ST-DA3 Line Level Distribution Amplifier - 1x3

      RDL ST-DA3 Line Level Distribution Amplifier - 1x3

      The ST-DA3 gives you the advantages of an audio distribution amplifier PLUS you can put it where you need it. The ST-DA3 allows bridging of any audio line, adjusting the gain, and driving up to three high or low impedance, balanced or unbalanced loads. The ST-DA3's wideband circuitry produces the unsurpassed pure clarity, low-distortion and low-noise for which RDL products are known. The ST-DA3 features RDL's SupplyFlex power input configuration. The module will operate directly from floating...

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      Item #: ST-DA3

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

      Our Price: $142.43

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    • RDL STM-1 Microphone Preamplifier - 50 dB Gain

      RDL STM-1 Microphone Preamplifier - 50 dB Gain

      The RDL STM-1 is a low-cost quality microphone preamplifier 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 50 dB gain to bring any mic-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 33 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. For intercom applications,...

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      Item #: STM-1

      Availability: In Stock

      Our Price: $106.03

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    • RDL SF-DN4 Two Left/Right Digital Audio to Four Dante Network Audio Signal Interface

      RDL SF-DN4 Two Left/Right Digital Audio to Four Dante Network Audio Signal Interface

      The SF-DN4 is a digital audio interface that converts two stereo digital audio sources to four Dante network audio channels. The SF-DN4 automatically detects a valid input on any of the three input jacks: S/PDIF optical, S/PDIF coaxial, or AES/EBU XLR. The input is decoded, re-clocked and transmitted to the Dante network. A yellow front-panel LOCK LED indicates a valid source received without any lock errors. Special software is not required to configure the module. The SF-DN4 is a professional...

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      Item #: RDL-SF-DN4

      Availability: In Stock

      Our Price: $510.00

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    • RDL STP-1 Universal Audio Attenuator - 2 Channel

      RDL STP-1 Universal Audio Attenuator - 2 Channel

      The RDL STP-1 is single unit containing a pair of convenient attenuator pads that can be located at the precise location that attenuation is needed. The low-cost STP-1 eliminates the costly labor of figuring and assembling fixed pads. Multi-turn trimmers in the STP-1 permit precise adjustment of levels without the need to connect any jumpers or external resistors. The STP-1 operates in either high or low impedance, balanced...

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      Item #: STP-1

      Availability: In Stock

      Our Price: $61.87

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    • RDL SF-BNC2 Bidirectional Unbalanced Stereo Audio Network Interface

      RDL SF-BNC2 Bidirectional Unbalanced Stereo Audio Network Interface

      The SF-BNC2 is a bidirectional Dante audio network interface. It features two unbalanced audio inputs (left and right) on RCA or stereo 3.5 mm Mini-jack connectors, as well as two unbalanced audio outputs (left and right) on RCA and stereo 3.5 mm Mini-jack connectors. Special software is not required to configure the SF-BNC2. Each input provides a network digital audio level of -20 dBFS for an unbalanced -10 dBV input. Each output provides -10 dBV unbalanced for a network digital...

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      Item #: RDL-SF-BNC2

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

      Our Price: $465.00

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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 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 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 TX-A2 Balanced to Unbalanced Audio Converter

      RDL TX-A2 Balanced to Unbalanced Audio Converter

      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-IC1 Intercom Amplifier

      RDL ST-IC1 Intercom Amplifier

      The ST-IC1 is the ideal choice where an intercom system is to be installed, or where an amplifier is needed to bring a mic level up to a 1 W speaker level with optional muting capability. The ST-IC1 has one input, one output and two muting control terminals. The input accepts a dynamic mic, a condenser mic (a phantom supply input terminal is provided to power condenser mics), an 8 Ohm speaker or a 45 Ohm speaker. The gain range of the module is sufficient to accommodate this wide variety of...

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      Item #: ST-IC1

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

      Our Price: $133.63

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    • RDL TX-AT1S Audio Isolation Transformer with Suppression

      RDL TX-AT1S Audio Isolation Transformer with Suppression

      The TX-AT1S is part of the group of versatile Max-TX series products from Radio Design Labs. Max-TX modules are the large format members of the RDL TX family, featuring the superior engineering and components common to RDL products. The durable adhesives provided with the TX-AT1S permit permanent or removable mounting. The TX-AT1S may be rack or surface mounted with optional TX series accessories. The TX-AT1S is the ideal choice in many applications requiring studio quality transformer coupling...

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      Item #: TX-AT1S

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

      Our Price: $99.79

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    • RDL STD-600 Passive Audio Divider/Combiner - 600 Ohm

      RDL STD-600 Passive Audio Divider/Combiner - 600 Ohm

      Each STD module is a resistive branching network with RF filtering on each of the four channels. Any channel, A through D, may be either an input or an output. This permits combining stereo signals into mono inputs, splitting mono signals to multiple inputs, and even combining microphones with output shorting switches into a single amplifier input. The STD modules are available in 150 Ohm, 600 Ohm and 10 k Ohm models. All inputs and outputs are balanced. Features: 600 Ohm Operation Combine Audio...

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      Item #: STD-600

      Availability: In Stock

      Our Price: $56.67

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    • Radio Design Labs RU-ADA8D 8 Channel Stereo Audio Distribution Amplifier

      Radio Design Labs RU-ADA8D 8 Channel Stereo Audio Distribution Amplifier

      The RU-ADA8D is an eight channel stereo audio distribution amplifier with input and output gain adjustments and input level metering. The module may be operated in mono to provide up to sixteen distributed mono signals. The inputs and outputs are connected on rear-panel detachable terminal blocks. Each of the two line level inputs accepts either a balanced or an unbalanced signal. Each input is equipped with a front panel INPUT GAIN trimmer. Input signal levels between -14 dBV unbalanced and...

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      Item #: RDL-RU-ADA8D

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

      Our Price: $385.79

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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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