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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 th

         

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        Item #: ST-VCA3

        Availability: Usually ships in 3-10 business days

        Our Price: $117.95

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      • RDL ST-TC1 Telephone System Coupler - CO Line Simulator

        RDL ST-TC1 Telephone System Coupler - CO Line Simulator

        The ST-TC1 is intended to be connected to an on-site telephone system switching unit KSU. It is NOT intended to be connected directly to a telephone CO line. Connections from the ST-TC1 go into the telephone switching unit as if the ST-TC1 was an incoming phone line.

        When the KSU seizes the line to the ST-TC1, a relay contact closure is provided which can be used to control a variety of equipment, such as a paging system or radio system. The closure is maintained as long as the line is seized. A

           

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          Item #: ST-TC1

          Availability: Usually ships in 3-10 business days

          Our Price: $100.95

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        • Jensen JT-11-BMCF Line Output Audio Transformer

          Jensen JT-11-BMCF Line Output Audio Transformer

          1:1 BIFILAR WINDINGS
          This transformer is designed for ultra-high performance line output stages.Specially processed 80% nickel core alloy is used for lowest possible harmonicdistortion of high level low frequency signals. For best performance, driving signalsshould be free of DC and source impedance kept as low as possible.

          • Distortion 0.002% typ at 20 Hz and +4 dBu output level
          • Wide bandwidth: !3 dB at 0.15 Hz and 15 MHz
          • Drives 600 S loads to levels up to +27 dBu at 20 Hz
          • Excellent time d

           

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          Item #: JT-11-BMCF

          Availability: Direct Ship From Manufacturer

          Our Price: $94.95

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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: Usually ships in 3-10 business days

            Our Price: $148.95

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          • JLCooper MLA-10 4 In 4 Out MIDI Line Amplifier - Rack Mount

            JLCooper MLA-10 4 In 4 Out MIDI Line Amplifier - Rack Mount

            JLCooper Electronics extends the distance of MIDI with the MLA Series - MIDI Line Amplifiers. They let you effectively extend MIDI cable length using twisted pair wire or a standard audio snake.

            MIDI Line Amplifiers are specifically designed for sending MIDI data over long distances with the capability to send information in excess of 1000 feet.

            Ideal for touring systems or permanent installations, MLA's can be used in schools, recording and production facilities, board- rooms, live performances,



                 

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                Item #: JLC-MLA-10

                Availability: Usually ships in 3-10 business days

                Our Price: $499.00

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              • JLCooper MLA-XLR MIDI Line Amplifier Over Balanced Audio Cables

                JLCooper MLA-XLR MIDI Line Amplifier Over Balanced Audio Cables

                JLCooper Electronics extends the distance of MIDI with the MLA Series - MIDI Line Amplifiers. They let you effectively extend MIDI cable length using twisted pair wire or a standard audio snake.

                MIDI Line Amplifiers are specifically designed for sending MIDI data over long distances with the capability to send information in excess of 1000 feet.

                Ideal for touring systems or permanent installations, MLA's can be used in schools, recording and production facilities, board- rooms, live performances,



                     

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                    Item #: JLC-MLA-XLR

                    Availability: Usually ships in 3-10 business days

                    Our Price: $249.95

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                  • ATI 4 CH Line Amplifier - Transformer Output

                    ATI 4 CH Line Amplifier - Transformer Output

                    ATI 4 CH Line Amplifier - Transformer Output
                    Four or eight individual channels to boost either microphone or line level balanced inputs up to +24 dBm, 600 ohm line levels with either active or transformer balanced outputs. Use as microphone, line buffer, IHF interface, audio distribution and level matching amplifiers. Drive headphones or interfaces phone line. Combine channels with rear connector jumpers to formstereo summing networks, DAs, simple mixers or even a press box. Adjustable gain, up t


                     

                    3 Types Available

                    Item #: MLA400-1

                    Availability: Direct Ship From Manufacturer

                    Our Price: $1,090.00

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                  • Palmer Audio PLDB02 Line Driver and Booster

                    Palmer Audio PLDB02 Line Driver and Booster

                    Balancing and boosting weak unbalanced signals, the PLDB02 is the perfect solution where signal integrity must be maintained over long cable runs. Unlike common active DI boxes, the PLDB02 provides up to 18 dB of signal boost in 6 dB steps making unbalanced -10 dBV consumer equipment compatible with the professional studio level. The balanced PLDB02 output provides lossless signal transfer via microphone cable lengths of up to 100s of yards. If required, the companion PLDB02R matchbox unbalances

                         

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                        Item #: PLM-PLDB02

                        Availability: In Stock

                        Our Price: $329.95

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                      • QSC SPA4-60 1/2 RU 4 Channel ENERGY STAR Low Impedance Amplifier

                        QSC SPA4-60 1/2 RU 4 Channel ENERGY STAR Low Impedance Amplifier

                        The SPA Series amplifiers from QSC are two half rack 1U, convection cooled power amplifiers delivering two or four channels of 60 watts per channel into 4Ω and 8Ω. These amps can also be bridged to supply 200 watts into 4Ω and 8Ω, and up to 250 watts into 70V or 100V loads making them extremely flexible for Low-Z or High-Z applications. Utilizing an advanced Class-D amplifier design and Universal Power Supply the SPA Series are amazingly efficient allowing them to be conv


                           

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                          Item #: QSC-SPA4-60

                          Availability: Usually ships in 3-10 business days

                          Our Price: $700.00

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                        • Radial J Plus-4 Stereo -10dB to Plus-4dB Line Driver

                          Radial J Plus-4 Stereo -10dB to Plus-4dB Line Driver

                          The Radial J+4 is a stereo interface designed to accept unbalanced low output level devices such as instruments, computers or CD players and boost the signal to a balanced +4dB level for easy manipulation in professional environments such as broadcast, recording studios and live touring.

                          The design begins with 100% discrete components for optimal signal transfer. Careful attention has been paid to eliminate noise by combining the advantages of active signal buffering with transformer isolation. T




                               

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                              Item #: RAD-J4

                              Availability: Usually ships in 3-10 business days

                              Our Price: $229.99

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                            • RDL STA-1M Audio Line Amplifier - Mono: -14 to 14 dB Gain

                              RDL STA-1M Audio Line Amplifier - Mono: -14 to 14 dB Gain

                              The STA-1M allows bridging any audio line, adjusting the gain, and driving a balanced or unbalanced line. The circuit design allows the input to accept either balanced or unbalanced signals, of either high or low impedance. This is an instrumentation type input stage which will amplify the differential input, regardless of ground reference. The output is capable of driving either high or low impedance loads, and the output may be connected either balanced or unbalanced.

                              RDL's SupplyFlex power inp





















                               

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                              Item #: STA-1M

                              Availability: Usually ships in 3-10 business days

                              Our Price: $105.95

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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 no


                                 

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                                Item #: STA-2A

                                Availability: In Stock

                                Our Price: $145.25

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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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                                  Audio Line Amplifiers

                                  Audio line amplifiers can be purchased in balanced, unbalanced, mono or multichannel configurations and Markertek carries them all! Audio line amplifiers provide varying degrees of gain, depending on your application requirements. Line amplifiers can be used to match signals between CD players, cassette decks, computers and professional audio equipment. If you aren't sure which Audio line amplifier is right for you, contact a Markertek representative today.

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