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Radio Design Labs

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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 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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    • 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-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 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 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 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 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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    • RDL ST-GCA3 Gain Control Amplifier - Line Level

      RDL ST-GCA3 Gain Control Amplifier - Line Level

      The ST-GCA3 constantly adjusts for changes in input levels, bringing up low levels, and reducing gain for high levels. The audio level is constantly adjusted to maintain the correct output. The AGC adjustment rate is switch-selectable. Making audio levels uniform and consistent improves the performance of nearly any type of audio system, and the ST-GCA3 SLOW mode is ideal for leveling music sources. The FAST setting of the ST-GCA3 makes it ideal for use in systems prone to loud bursts of audio,...

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      Item #: ST-GCA3

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

      Our Price: $129.48

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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: In Stock

      Our Price: $142.43

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    • RDL TX-J2 Unbalanced Input Transformer Zoom Rooms compatible

      RDL TX-J2 Unbalanced Input Transformer Zoom Rooms compatible

      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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    • 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 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 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-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 RU-MLA2 Dual Microphone / Line Preamplifier

      RDL RU-MLA2 Dual Microphone / Line Preamplifier

      The RU-MLA2 is a dual channel audio preamplifier. The inputs and outputs may be connected through the front-panel XLR jacks or on the rear panel detachable terminal blocks. Each input accepts either a balanced microphone or line level signal. Each output 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-MLA2 may be rack-mounted with the XLR jacks facing forward, or may be reverse-mounted using the RDL...

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      Item #: RU-MLA2

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

      Our Price: $266.75

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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: In Stock

      Our Price: $385.79

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    • RDL ST-PA2 2 W Mono Audio Amplifier - 8 Ohm

      RDL ST-PA2 2 W Mono Audio Amplifier - 8 Ohm

      The ST-PA2 features a single, unbalanced audio input, a gain control, and two outputs. The first output is designed to deliver a clean 2 watts RMS into an 8 Ohm speaker. The second output is intended to drive 600 Ohm transformers, typically on equipment inputs. This makes the ST-PA2 uniquely suited to applications such as music-on-hold inputs on telephone systems which may have either 8 Ohm or 600 Ohm inputs. If desired, both outputs may be used at the same time. Features: 2 Watts RMS into...

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      Item #: ST-PA2

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

      Our Price: $70.20

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    • RDL FP-PA35A 35 W Mono Audio Amp - 25 V / 70 V / 100 V w/Power Supply

      RDL FP-PA35A 35 W Mono Audio Amp - 25 V / 70 V / 100 V w/Power Supply

      The FP-PA35A is the ideal choice in many applications where multiple 25 V, 70 V or 100 V speakers in a zone need to be powered from a single audio power amplifier. The FP-PA35A features a balanced line level input that may be connected unbalanced. A front panel gain control is designed to be adjusted manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced levels as well as professional balanced levels. Multiple distributed sound system speakers connect to...

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      Item #: FP-PA35A

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

      Our Price: $218.90

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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 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: In Stock

      Our Price: $160.11

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    • RDL HD-MA35A 35 Watt Mixer Amplifier with Power Supply - Constant Voltage Output 25 V 70 V or 100 V

      RDL HD-MA35A 35 Watt Mixer Amplifier with Power Supply - Constant Voltage Output 25 V 70 V or 100 V

      The HD-MA35A is a three input audio mixer amplifier for systems demanding a broad range of features and high energy efficiency. Two output power amplifier zones are provided, 35 W (Zone 1) and 2 W (Zone 2). The Zone 1 output is driven from a high-efficiency Class D amplifier stage. The Zone 1 amplifier output level may be VCA controlled using various optional RDL remote controls, or by industry standard 0 to 10 Vdc or 0 to 10 kOhm controls. This output provides a constant voltage (25 V, 70 V or...

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      Item #: RDL-HD-MA35A

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

      Our Price: $279.55

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    • RDL D-BT1A Wall Mounted Bluetooth Audio Format-A Interface (White)

      RDL D-BT1A Wall Mounted Bluetooth Audio Format-A Interface (White)

      The RDL D SERIES-BT1A modules (D-BT1A) are Bluetooth audio receiving modules compatible with RDL® Format-A twisted pair receivers. When paired with a compatible Bluetooth enabled device, the module receives stereo audio from the Bluetooth source. The stereo signal is sent through two Format-A pairs to any RDL Format-A receiver. A stereo/mono switch set by the installer permits summed mono audio to be sent over one switch-selected pair to the Format-A receiver. If set for stereo operation,...

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      3 Colors Available

      Item #: RDL-D-BT1A

      Availability: In Stock

      Our Price: $279.00

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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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      3 Colors Available

      Item #: RDL-DD-BTN44

      Availability: In Stock

      Our Price: $685.00

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    • RDL DDB-BN22 Wall-Mounted Bi-Directional Mic/Line Dante Interface 2 x 2

      RDL DDB-BN22 Wall-Mounted Bi-Directional Mic/Line Dante Interface 2 x 2

      The DDB-BN22 is a complete wall-mounted Dante audio network interface. It features two XLR mic or line inputs and two XLR mic or line outputs on the front panels. Special software is not required to configure the DDB-BN22. Each XLR input provides three switches that may be set from the front of the unit when the cover plate is not installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain. Each XLR output provides...

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      Item #: RDL-DDB-BN22

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

      Our Price: $550.00

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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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