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Radio Design Labs

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    • RDL TX-1W Music on Hold Amplifier - 1 Watt

      RDL TX-1W Music on Hold Amplifier - 1 Watt

      The TX-1W is the ideal choice in on-site installations where the central telephone switching unit needs to be fed with music, voice or combined music/voice signals.

      There is a wide variety of telephone instruments in use. When a caller is placed on hold, the audio quality perceived is affected by the caller's own telephone, as well as the telephone lines, central switch and on-site equipment. Due to these variations, conventional audio amplifiers used as music-on-hold drivers frequently produce a

         

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        Item #: TX-1W

        Availability: Usually ships in 3-10 business days

        Our Price: $68.49

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      • RDL PS-24AS 500mA AC/DC Power Supply For Stick-Ons & Rack Ups

        RDL PS-24AS 500mA AC/DC Power Supply For Stick-Ons & Rack Ups

        Unit powers multiple, similar Stick Ons and Rack-Ups. Call our Tech Support for compatibility of non similar units.

         

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        Item #: PS24V

        Availability: In Stock

        Our Price: $24.06

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      • RDL STA-1 Dual Balanced/Unbalanced Line Amplifier -12 to 20 dB Gain

        RDL STA-1 Dual Balanced/Unbalanced Line Amplifier -12 to 20 dB Gain

        The STA-1 is a dual-channel line-level preamplifier with bridging inputs, adjustable gain or loss, and low-impedance outputs. Each of the two identical circuits is both an electronic line transformer and a line amplifier. Hook up the STA-1 just like a pair of audio transformers with gain. True dc amplifiers produce unsurpassed audio clarity, high common-mode rejection, ultra-low distortion and low noise. The STA-1 is perfect for most line amplification, impedance or balanced/unbalanced conversio

           

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          Item #: STA1

          Availability: Usually ships in 3-10 business days

          Our Price: $144.49

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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 of

             

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            Item #: ST-UBA2

            Availability: In Stock

            Our Price: $148.95

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          • RDL TX-J2 Unbalanced Input Transformer

            RDL TX-J2 Unbalanced Input Transformer

            • Mix two unbalanced audio signals to mono balanced
            • Combine stereo into mono with balanced output
            • Unbalanced to balanced conversion without gain
            • Hum cancellation on unbalanced line inputs
            • Frequency response 30 Hz to 20 kHz (+/- 1 dB)

             

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            Item #: TX-J2

            Availability: In Stock

            Our Price: $57.49

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          • RDL DB-PSP1A Decora-Style Active Loudspeaker - Format-A

            RDL DB-PSP1A Decora-Style Active Loudspeaker - Format-A

            The D SERIES-PSP1A is a compact active loudspeaker that delivers rich, detailed sound in Decora-compatible wall or chassis mounts. It is a single-pair audio amplifier module compatible with RDL Format A twisted pair products. The PSP1A receives audio and 24 Vdc power through a rear-panel RJ45 jack. A rear-panel switch set during installation determines which of the three FORMAT-A pairs is amplified. Amplification is provided by a high-efficiency Class D power stage with audio filtering tailored

                 

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                Item #: RDL-DB-PSP1A

                Availability: Usually ships in 3-10 business days

                Our Price: $177.27

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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 b

                     

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                    Item #: RDL-RU-ADA4D

                    Availability: In Stock

                    Our Price: $241.49

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                  • RDL HR-DAC1 Digital to Analog Converter - 24 bit 192 kHz

                    RDL HR-DAC1 Digital to Analog Converter - 24 bit 192 kHz

                    The HR-DAC1 is the ideal choice in installations requiring high quality analog audio from an AES/EBU, AES-3ID or S/PDIF digital audio source. The HR-DAC1 automatically detects a valid input on any of the four input jacks: S/PDIF optical, S/PDIF coaxial, AES-3ID or AES/EBU. The AES/EBU input is 110 Ohm terminated; the S/PDIF coaxial and AES-3ID jacks are 75 Ohm terminated. A front-panel LOCK LED indicates the presence of a valid digital audio source without any phase-lock or bit errors. Sample ra

                       

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                      Item #: HR-DAC1

                      Availability: Usually ships in 3-10 business days

                      Our Price: $465.49

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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.

                      Required Power Supply RDL PS24V Sold Separately

                      • 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: $74.49

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                    • RDL RU-UDA4 Stereo Audio Distribution Amplifier - 2x4 - RCA Jacks

                      RDL RU-UDA4 Stereo Audio Distribution Amplifier - 2x4 - RCA Jacks

                      The RU-UDA4 is the optimum choice where connectorized, unbalanced line-level distribution is needed. This unit features two separate, isolated channels. The RU-UDA4 may be used in stereo applications, or as two individual monaural distribution amplifiers. The input signals are buffered through output line drivers, providing four separate line-level unbalanced outputs for each of the two inputs.

                      The RU-UDA4 performance is tailored around industry standard -10 dBV input/output levels. Excellent fre

                         

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                        Item #: RU-UDA4

                        Availability: In Stock

                        Our Price: $167.95

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

                        RDL TX-1A Balanced to Unbalanced Transformer - Adjustable

                        • Provides transformer isolation between balanced line and unbalanced input
                        • Level trimpot adjusts output 4 to 24 dB below input level
                        • Input may be 10 k Ohm bridging or 600 Ohm terminated
                        • Frequency response 20 Hz to 20 kHz (+/- 0.5 dB)
                        • THD: < 0.05% (1 kHz)

                         

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                        Item #: TX-1A

                        Availability: In Stock

                        Our Price: $35.49

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                      • RDL ST-MX2 2 Channel Audio Mixer - Microphone or Line Input and Output

                        RDL ST-MX2 2 Channel Audio Mixer - Microphone or Line Input and Output

                        The ST‑MX2 is used in any application requiring mixing of two audio sources. A mic may be mixed with a line‑level music source. Two mics may be mixed to feed the mic or line level input of a power amplifier. A mic or professional +4 dBu line‑level mono sum is possible. It may be used to convert mono line‑level signals from consumer to professional, or from professional to consumer format. It may also be used as a microphone preamplifier, or conversely to adapt unbalanced

                           

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                          Item #: ST-MX2

                          Availability: In Stock

                          Our Price: $132.49

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                        • RDL EZ-MX4ML 4x1 Mic and Stereo Line Audio Mixer

                          RDL EZ-MX4ML 4x1 Mic and Stereo Line 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-MX4ML

                              Availability: In Stock

                              Our Price: $162.49

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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.

                              • 600 Ohm Operation
                              • Combine Audio Signals to

                               

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                              Item #: STD-600

                              Availability: In Stock

                              Our Price: $54.49

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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 24

                                 

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                                Item #: ST-DA3

                                Availability: In Stock

                                Our Price: $136.95

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                              • RDL EZ-MPA2 Stereo Output Dual Microphone Preamplifier

                                RDL EZ-MPA2 Stereo Output Dual Microphone Preamplifier

                                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-MPA2

                                    Availability: In Stock

                                    Our Price: $178.95

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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 t

                                       

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                                      Item #: ST-PA6

                                      Availability: In Stock

                                      Our Price: $94.49

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

                                      RDL STM-2 Adjustable Gain Microphone Preamplifier - 35 to 65 dB Gain

                                      The RDL STM‑2 is a quality low‑noise microphone preamplifier designed for use in commercial sound, broadcast, and recording. The STM‑2 is very flexible, with gain adjustment from 35 to 65 dB, two balanced or unbalanced outputs, and available phantom supply input. Its ultra‑low distortion and low noise performance make it the best choice, even when larger preamps could be used.

                                      The STM 2 supply input is single ended and operates from 24 Vdc. Operation from 12 Vdc is possibl

                                           

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                                          Item #: STM-2

                                          Availability: In Stock

                                          Our Price: $139.95

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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: $152.95

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                                            • RDL STD-10K Passive Audio Divider/Combiner - 10 k Ohm

                                              RDL STD-10K Passive Audio Divider/Combiner - 10 k 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.

                                              • 10 k Ohm Operation
                                              • Combine Audio Signals to

                                               

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                                              Item #: STD-10K

                                              Availability: In Stock

                                              Our Price: $54.49

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                                            • RDL EZ-PA20 20 Watt Stereo Audio Power Amplifier

                                              RDL EZ-PA20 20 Watt Stereo Audio Power Amplifier

                                              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-PA20

                                                  Availability: In Stock

                                                  Our Price: $128.49

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                                                • RDL RU-TPS4A Active Sender / Distributor - Three Audio Inputs to Four Outputs

                                                  RDL RU-TPS4A Active Sender / Distributor - Three Audio Inputs to Four Outputs

                                                  The RU-TPS4A is a four output audio sender, signal and power distributor module compatible with RDL Format-A twisted pair products. Three line-level sources may be connected to the module using the +4 dBu balanced detachable terminal block. A bank of studio-quality buffer amplifiers feed the three pairs of the four rear-panel RJ45 OUTPUT jacks at the correct operating level.

                                                  Three RDL Dual-LED VU meters are provided on the front panel of the RU-TPS4A. One meter monitors the audio level on each of


                                                     

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                                                    Item #: RDL-RU-TPS4A

                                                    Availability: Usually ships in 3-10 business days

                                                    Our Price: $242.49

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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: $256.95

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                                                    • RDL PT-AMG2 Portable Audio Signal Generator & Monitor

                                                      RDL PT-AMG2 Portable Audio Signal Generator & Monitor

                                                      This portable audio instrument is comprised of a precision audio oscillator, precision level meter and speaker.

                                                      The 700 Hz oscillator section features two outputs. The balanced XLR output is front-panel switch selectable for MIC or LINE level (pro level). The unbalanced output operates at -10 dBV (consumer). Output stability is suited to accurate bench top audio testing.

                                                      The audio metering circuit features two inputs, an LED meter and a monitor speaker. The balanced input is front-panel switch sel

                                                         

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                                                        Item #: PT-AMG2

                                                        Availability: In Stock

                                                        Our Price: $295.95

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                                                      • RDL ST-SH2 Stereo Headphone Amplifier - Stick-On Series

                                                        RDL ST-SH2 Stereo Headphone Amplifier - Stick-On Series

                                                        The ST‑SH2 is used in applications requiring headphones of any impedance to be driven from consumer or professional audio sources. For fixed level installations not requiring user volume control, the ST‑SH2 is wired to the audio source and to a headphone jack. Frequently, it is desirable to mount a volume knob by the headphone jack. The LEVEL ADJUST terminals (L) and ® may be wired to the respective wipers of a stereo 10 kΩ potentiometer to provide volume adjustment. It is r





                                                           

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                                                          Item #: ST-SH2

                                                          Availability: Usually ships in 3-10 business days

                                                          Our Price: $122.49

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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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