AC-JB20-XFMR

The Soundtube AC-JB20-XFMR is a versatile 20W speaker transformer housed in a robust J-box, designed for use in various sound systems. This transformer is engineered to handle voltages of 25 volts, 70.7 volts, or 100 volts, making it an excellent choice for commercial installations, public address systems, or other professional applications.

The AC-JB20-XFMR features a heavy-duty construction with a powder-coated steel J-box, ensuring durability and protection against harsh environments. The transformer's secondary winding is shielded, minimizing electromagnetic interference and ensuring a clear sound output. The transformer also includes a built-in over-current protective device, providing an added layer of safety.

This transformer is designed for use in 70.7V and 100V line-array systems. It has a primary winding with a 13.1A rating, allowing it to handle the power demands of larger systems. The secondary winding is rated for 20W, providing sufficient power for most mid-range or full-range speakers. The transformer's impedance is 8 ohms, making it a compatible match for a wide range of speaker types.

The AC-JB20-XFMR is also equipped with a terminal block for easy connection of speakers and power sources. The terminal block includes both screw and banana plug terminals, allowing for flexibility in wiring configurations. The transformer's dimensions are 7.7 inches (19.5 cm) long, 4 inches (10.2 cm) wide, and 2.2 inches (5.6 cm) high, making it a compact yet powerful addition to any sound system.

In summary, the Soundtube AC-JB20-XFMR is a versatile and powerful 20W speaker transformer housed in a rugged J-box. Its ability to handle 25, 70.7, and 100 volts, combined with its heavy-duty construction and shielded secondary winding, make it an ideal choice for commercial and professional sound applications. The transformer's convenient terminal block and compact size add to its versatility and ease of installation.

Pros and Cons of Buying Soundtube AC-JB20-XFMR 20W 25/70.7/100V Speaker Transformer J-Box

a. Versatile Voltage Range: This transformer supports various voltage ranges (25V, 70.7V, and 100V), making it suitable for a wide range of audio systems.

b. Compact Design: The J-box design makes it easy to install and integrates seamlessly into your audio setup.

c. Durable Construction: The transformer is built to last, with a robust design that can handle regular use in various audio applications.

d. Cost-Effective: Compared to buying multiple transformers for different voltage ranges, this transformer offers a cost-effective solution.

a. Limited Power Handling: With a power handling capacity of only 20W, this transformer may not be suitable for high-power audio systems.

b. Lack of Overload Protection: Some users have reported that the transformer does not have built-in overload protection, which could potentially lead to damage if not used carefully.

c. Potential for Hum and Noise: Depending on the quality of the transformer and the installation, there may be some hum or noise present in the audio output.

The Soundtube AC-JB20-XFMR 20W 25/70.7/100V Speaker Transformer J-Box offers a versatile voltage range, compact design, durable construction, and cost-effectiveness. However, it has limited power handling, lacks overload protection, and may introduce some hum or noise. If you are looking for a transformer for a low-power audio system and require flexibility with voltage ranges, this transformer could be a good choice. Otherwise, consider a more powerful transformer with built-in overload protection and better noise reduction features.

For a more powerful and feature-rich speaker transformer, consider the Mouser Electronics 1125-1005 Speaker Transformer. It offers a higher power handling capacity (100W), built-in overload protection, and better noise reduction features. While it may not have the same level of voltage flexibility, it could be a better choice for more demanding audio applications.

Details:

25 volt only: 2.5 w, 1.3 0.7 0.4 w. Tap settings include 20 w, 10 5 and 2.5 w 2.5 tap not available on 100 v setting. Includes 4-position tap switch. Can be added to any low impedance speaker.

From Soundtube: 20 watt 25/70.7/100 volt transformer inside a junction box.

specifications vidioaudio:

• brand: Soundtube
• mpn: Ac-jb20-xfmr
• part type: Transformer Speaker Box

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• category: Electronics > Tv, Video Home Audio

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• in stock #: 2
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• started: march 29, 2026