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Radio Design Labs

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    • RDL TX-PA40D 40 W Stereo Audio Amplifier - 8 Ohm with Power Supply

      RDL TX-PA40D 40 W Stereo Audio Amplifier - 8 Ohm with Power Supply

      The TX‑PA40D is the ideal choice in many applications where a high quality, high‑efficiency utility amplifier is needed to drive a pair of 4 Ω or 8 Ω speakers. It is specifically suited to fixed‑gain amplification applications where gain is controlled by other equipment. Examples include projectors with variable audio outputs used in classrooms, boardrooms and video conferencing. The TX‑PA40D features two unbalanced line level inputs on high‑reliability...

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      Item #: RDL-TXPA40D

      Availability: Usually ships in 3-10 business days

      Our Price: $228.27

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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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      Item #: RU-MX4L

      Availability: Usually ships in 3-10 business days

      Our Price: $281.84

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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. Features: 10 k Ohm Operation Combine Audio...

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      Item #: STD-10K

      Availability: In Stock

      Our Price: $56.67

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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 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 RU-MX5ML 5 Channel Mic/Line Audio Mixer with Phantom Power

      RDL RU-MX5ML 5 Channel Mic/Line Audio Mixer with Phantom Power

      The RU-MX5ML is the ideal choice in many applications where a combination of balanced mic and/or balanced or unbalanced line-level signals needs to be mixed with the ability for additional expansion. All connections are made using detachable terminal blocks on the rear panel. Four of the RU-MX5ML inputs can accept either mic or line inputs. The fifth input is for line level sources. 24 V phantom is individually switch selectable for each mic input. The output from one RU-MX5ML may connect to...

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      Item #: RU-MX5ML

      Availability: In Stock

      Our Price: $265.15

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    • RDL DS-RC3M Remote Audio Mixing Control with Muting

      RDL DS-RC3M Remote Audio Mixing Control with Muting

      The D-RC type remote audio mixing controls provide user-accessible volume knobs for two or three sources. Each control is available with level controls only, or with level controls plus a muting button for each channel. They function exactly as a mixer without the need to send audio to and from the remote location. A rear-panel RJ45 jack provides the connection for standard twisted-pair wiring between the remote control and an RDL remote-controlled mixer. The cable sends the knob position and...

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      Item #: RDL-DS-RC3M

      Availability: Usually ships in 3-10 business days

      Our Price: $145.08

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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: Usually ships in 3-10 business days

      Our Price: $137.80

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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: Usually ships in 3-10 business days

      Our Price: $168.98

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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: Usually ships in 3-10 business days

      Our Price: $133.63

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    • RDL D-BZR Piezo Alert Module - Wall-Box

      RDL D-BZR Piezo Alert Module - Wall-Box

      ANYWHERE YOU NEED... Audible Alert of A Remote Condition An LED Alarm Indicator A Front-Panel Reset Button Remote Reset Provision Momentary or Latching Operation Selectable Audio Level You Need The BZR! The BZR is an audible alert module available in two formats. The R-BZR can be mounted in limited space using the adhesive methods popularized by RDL's STICK-ON series. The D-BZR may be mounted in a wall-box enclosure for use in walls or...

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      Item #: RDL-D-BZR

      Availability: Usually ships in 3-10 business days

      Our Price: $102.00

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    • RDL DS-RC3 Remote Audio Mixing Control

      RDL DS-RC3 Remote Audio Mixing Control

      The D-RC type remote audio mixing controls provide user-accessible volume knobs for two or three sources. Each control is available with level controls only, or with level controls plus a muting button for each channel. They function exactly as a mixer without the need to send audio to and from the remote location. A rear-panel RJ45 jack provides the connection for standard twisted-pair wiring between the remote control and an RDL remote-controlled mixer. The cable sends the knob position and...

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      Item #: RDL-DS-RC3

      Availability: Usually ships in 3-10 business days

      Our Price: $126.04

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    • RDL DS-SP1A 2 Watt Decora-Style 8 Ohm Loudspeaker - Stainless Steel

      RDL DS-SP1A 2 Watt Decora-Style 8 Ohm Loudspeaker - Stainless Steel

      The D SERIES-SP1A is a compact 8 ohm loudspeaker that delivers rich, detailed sound in Decora-compatible wall or chassis mounts. The driver is constructed of materials found in premium larger speakers. The unique steel enclosure provides full baffling in a tightly sealed rigid structure. This produces sonic presence within an extended frequency range expected from larger speakers. Internal filtering rolls off out-of-band frequencies to reduce distortion and increase peak power capability. Dispersion...

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      Item #: RDL-DS-SP1A

      Availability: Usually ships in 3-10 business days

      Our Price: $78.87

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    • RDL DS-TPA1A 3.5 W Audio Power Amplifier

      RDL DS-TPA1A 3.5 W Audio Power Amplifier

      The -TPA1A modules are two pair audio amplifier modules compatible with RDL Format A twisted pair products. Each -TPA1A receives stereo audio and 24 Vdc power through a rear-panel RJ45 jack. The left and right audio signals received on pairs B and C of the twisted pair cable are summed to mono and amplified. The amplified output level is set by an internal VCA which is controlled by a front-panel volume control. The VCA attenuator provides years of scratch-free gain adjustment.The -TPA1A circuits...

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      Item #: RDL-DS-TPA1A

      Availability: Usually ships in 3-10 business days

      Our Price: $149.86

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    • Radio Design Labs FP-MR2 Message Repeater

      Radio Design Labs FP-MR2 Message Repeater

      The FP-MR2 is a message repeater that permits electronic storage of a single recording up to one minute forty seconds in duration. This message may be played back manually using an external contact closure to ground or using the front-panel START button. The message may also be played back periodically using the interval timer included in the FP-MR2. A balanced line-level music input allows background music to be connected and the associated input potentiometer allows the installer to set the music...

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      Item #: RDL-FP-MR2

      Availability: In Stock

      Our Price: $296.90

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    • RDL FP-TPX3A Format-A Twisted Pair Remote Controlled Mixer

      RDL FP-TPX3A Format-A Twisted Pair Remote Controlled Mixer

      The FP-TPX3A is the ideal choice where a user-accessible mixer must control the volume of multiple sources in a zone. RDL Format-A twisted pair audio senders connect directly to the mixer, allowing each user input to be balanced or unbalanced, mic or line level. FP TPX3A outputs are provided in balanced and unbalanced formats. Two unbalanced outputs are available to feed the mono mixer output to a stereo amplifier input. Remote control of the mixer allows audio signals to be kept at a single equipment...

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      Item #: RDL-FP-TPX3A

      Availability: Usually ships in 3-10 business days

      Our Price: $335.00

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    • RDL HD-PA35U/A 35 W Power Amplifier 25 70 100 V w/Power Supply

      RDL HD-PA35U/A 35 W Power Amplifier 25 70 100 V w/Power Supply

      The HD-PA35UA is a single input audio amplifier for systems demanding the highest energy efficiency. It may be used as a single zone amplifier fed from a variety of RDL or OEM mixers. It is ideal for providing one or more additional zones to a mix originating from another RDL HD series mixer amplifier. The 35 watt power amplifier output is driven from a high-efficiency Class D amplifier stage. The amplifier normally shuts down (standby "sleep" mode) when audio is absent and automatically turns on...

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      Item #: RDL-HD-PA35UA

      Availability: Usually ships in 3-10 business days

      Our Price: $241.79

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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: Usually ships in 3-10 business days

      Our Price: $345.79

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    • RDL ST-CX2 Two Band Active Line-Level Crossover

      RDL ST-CX2 Two Band Active Line-Level Crossover

      The ST-CX2 is a line-level two band crossover to drive audio power amplifiers. The input and outputs are balanced and may be connected unbalanced if necessary. The input accepts a +4 dBu line-level signal. The module operates at nominal unity gain. The FULL RANGE output is designed for use with full-range speaker systems which do not contain a woofer (below 100 Hz). The passband is 100 Hz to 30 kHz, with an equalization adjustment centered at 2 kHz. Through the application of a smile-curve providing...

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      Item #: ST-CX2

      Availability: Usually ships in 3-10 business days

      Our Price: $124.27

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    • RDL ST-CX2S Subwoofer Crossover Filter

      RDL ST-CX2S Subwoofer Crossover Filter

      The ST-CX2S is a subwoofer signal equalizer in the STICK-ON series of products from RDL. The ST-CX2S offers flexibility in equalization adjustment, with the exceptional performance of RDL. The ST-CX2S features two separate, isolated balanced bridging inputs which may each be wired balanced or unbalanced. The output driver is 150 Ohm balanced which can drive low or high impedance balanced or unbalanced lines. The module operates at unity gain at 63 Hz (balanced input to balanced output). A BOOST...

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      Item #: ST-CX2S

      Availability: Usually ships in 3-10 business days

      Our Price: $124.27

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    • RDL ST-HP3 High Pass Filter - 300 Hz and 500 Hz

      RDL ST-HP3 High Pass Filter - 300 Hz and 500 Hz

      The ST-HP3 is the ideal choice where line-level audio filtering needs to be provided at the input of a power amplifier for protection of public address horns against damage from low frequencies. The ST-HP3 has one input and two filtered outputs: 300 Hz high pass and 500 Hz high pass. Both the input and output are balanced, and each may be wired unbalanced if required. The input accepts line-level (+4 dBu nominal) audio. The module operates at unity gain (balanced input and output). The two outputs...

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      Item #: ST-HP3

      Availability: Usually ships in 3-10 business days

      Our Price: $122.93

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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: Usually ships in 3-10 business days

      Our Price: $133.63

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    • RDL ST-VP1 Voice-Over / Paging Module - Manual

      RDL ST-VP1 Voice-Over / Paging Module - Manual

      The ST-VP1 is intended for voice-over paging with user adjusted and controlled FADE or CUT between two input sources. This unit is also perfect for voice-overs where precise and consistent fade levels are required. Automatic operation can be achieved when used in conjunction with RDL's ST-ACR products. Features: High-Quality Voice-Over Mixing Noiseless Paging Single Input Adapted for Paging or Voice-Over Selectable Fade-Under or Hard-Cut Adjustable Fade DEPTH and RATE Soft Audio...

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      Item #: ST-VP1

      Availability: Usually ships in 3-10 business days

      Our Price: $135.18

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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: Usually ships in 3-10 business days

      Our Price: $160.11

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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...

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      Item #: TX-1W

      Availability: Usually ships in 3-10 business days

      Our Price: $71.24

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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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