TSD, VCA, 2 In x 2 Out

The AtlasIED TSD-ML22VCA combines a 2-input, 2-output true VCA with a high-quality microphone preamplifier. Its published specifications cover microphone and line-level operation, balanced and unbalanced impedance values, selectable signal-conditioning features, and 24V operation. With a 20Hz to 20kHz frequency response and a compact 4-inch-wide enclosure, the unit provides a clearly defined set of audio functions without requiring a large installation footprint.

Ideal Use Cases

This model is suited to audio systems that require two inputs, two outputs, VCA functionality, and microphone preamplification in one component. It is particularly relevant when a design must accommodate microphone or line-level signals while retaining documented balanced and unbalanced impedance specifications. The defeatable phantom power and low-cut filter also make it appropriate for installations where those features may be required for one configuration but should be bypassed in another. Its dimensions can benefit systems where available equipment space is limited.

Why Choose This Model

The TSD-ML22VCA provides a specific combination of a true VCA and microphone preamplifier rather than addressing only one of those functions. The microphone input is specified for 46dB of gain with a 10mV (-40dBV) balanced input level. Defeatable 24VDC phantom power is available, allowing it to be enabled only when the connected microphone arrangement requires it. A defeatable 125Hz/12dB low-cut filter adds another selectable stage to the signal path. These published controls and operating values make it easier to evaluate the unit against defined system requirements before installation.

Installation and Integration

The enclosure measures 4 inches wide, 1.5 inches high, and 2.5 inches deep, equivalent to 10.16 x 3.81 x 6.35 cm. It weighs 6 ounces, or 0.165 kg. The unit is compatible with 24V power and has a listed 24VDC power requirement of 70mA. Input impedance is specified as 1.2K ohms balanced or 600 ohms unbalanced, while output impedance is 300 ohms balanced or 150 ohms unbalanced. These values give an installer concrete criteria for checking compatibility with upstream sources and downstream equipment. Mounting method, connector type, included accessories, and operating-temperature limits are not specified in the supplied data and should be confirmed separately when planning the installation.

Performance Highlights

The published frequency response spans 20Hz to 20kHz. Signal-to-noise ratio is listed at 85dBV for line-to-line operation and 55dBV for line-to-mic operation. The line input specification is listed as 1V (0dBV) balanced with 2V (+6dBV) balanced output, while the separate line output level entry is listed as 1V (0dBV) in. For microphone input, the stated 46dB gain and 10mV (-40dBV) balanced level provide the key values needed when matching a source. The supplied technical data also lists a 125Hz refresh rate.

What Makes It Different

The defining feature is the pairing of a 2 x 2 true VCA with a microphone preamplifier in the same model. Its feature set also includes defeatable 24VDC phantom power and a defeatable 125Hz/12dB low-cut filter, so both functions can be included or removed from the operating configuration as needed. Balanced and unbalanced impedance figures are provided for both the input and output sides, offering useful integration data for different signal arrangements. This combination is housed in a chassis measuring only 4 x 1.5 x 2.5 inches.

Final Assessment

The AtlasIED TSD-ML22VCA is a focused option for systems needing two-input, two-output VCA operation with microphone preamplification. Its 20Hz to 20kHz response, 46dB microphone gain, defeatable phantom power, defeatable low-cut filter, documented impedance values, and 70mA power requirement provide a practical basis for system matching. The product carries a warranty period of 36 months from the date of purchase.