Pro Intercom AD903 2-to-4 Wire Adaptor Active Transformer Isolation Audio In & Out
SKU: 17440818437

Pro Intercom AD903 2-to-4 Wire Adaptor Active Transformer Isolation Audio In & Out

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Description

Pro Intercom AD903 2-to-4 Wire Adaptor Active Transformer Isolation Audio In & OutThe AD903 has many functions for getting various levels of audio into an intercom circuit, or getting the intercom audio "traffic' out to an amplifier or recorder. It is also useful as a 2 to 4 wire adaptor for connecting 4 wire communications into and out of a standard intercom circuit. Both the input and the output are transformer isolated from whatever devices are connected. The wide range of level adjustments will accommodate almost any audio

The AD903 has many functions for getting various levels of audio into an intercom circuit, or getting the intercom audio "traffic' out to an amplifier or recorder.

It is also useful as a 2-to-4 wire adaptor for connecting 4-wire communications into and out of a standard intercom circuit.

Both the input and the output are transformer isolated from whatever devices are connected. The wide range of level adjustments will accommodate almost any audio signal.

The 'Null" control allows you to minimize or even eliminate any "cross-talk' between the input and output.

The input transformer is a studio grade device and will not degrade any audio that you feed it.

Access to the input and output are via a rear panel 4-pin XLR. Pins 1 and 2 are input and pins 3 and 4 are output.

The AD903 connects to the intercom circuit just as a beltpack does, through a rear panel 3-pin XLR.

The AD903 is also commonly used for connecting to a video camera CCU where a built-in intercom is provided that is not compatible with Pro Intercom or any of the other 200 Ohm unbalanced intercom systems.

The AD903 is powered by the intercom system and requires no batteries or separate power supply.

  • Transformer Isolated I/O
  • Use as 2-to-4 Wire Adapter
  • 4-pin XLR Input & Output
  • No Power Supply Needed
  • Power requirement:
    • 24 - 30 VDC, 15-25 mA
  • Input:
    • -60 to +30 dBm into 10K ohm nominal, balanced and floating
  • Output:
    • -60 to +30 dBm from 200 ohm nominal source, balanced and floating
  • Sidetone rejection:
    • 50 dBA
  • Audio bridging impedance (to the intercom system):
    • 200 ohm unbalanced
  • Size:
    • 3.70 x 4.30 x 2.50 in.(93.98 x 109.22 x 63.5 mm)
  • Weight:
    • 14.5 oz (0.411 Kg)
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SKU: 17440818437

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Yaite Carnero
Charlottesville, US
★★★★★ 5
Cuidado
Size: Size 6, Unit Count: 112
Exelente calidad
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
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Vassilios Damiras
Battle Creek, US
★★★★★ 5
History of Egypt
Format: Kindle
Egypt has played a vital role throughout history. This book traces and evaluates the history of Egypt from ancient times until the modern period. During ancient times, the Pharaohs created a strong Egypt. During the Ottoman times, Egypt played a significant role as a regional power. Both French and British played a vital role in Egyptian politics. The Suez canal put Egypt, an important player in world commerce. The Nasser regime entered Egypt into cold world politics. The USA managed under Sadat to place Egypt at the American camp. Eventually, Egypt was the first Arab country to sign a peace treaty with Israel after various brutal wars. Egyptian culture dominated western civilization throughout the centuries. The reader will enjoy this book.
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Reviewed in the United States on July 17, 2022
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Paul Shain
Whiting, US
★★★★★ 4
Great summary of Egyptian history
Format: Kindle
The book is—as the subtitle states—an “Overview of Egyptian History.” The book is a brief summary of Egypt’s long and interesting history. It starts with historical events: who were the rulers? What territories did Egypt conquer? Who conquered Egypt. The second part of the book discusses social, economic, and religious history. This primer lays out all of the above topics but with little detail so the reader may wish to select topics of interest to study in further depth elsewhere. Because Egypt’s history includes millennia, I find it hard to understand, so reading this book was valuable to me. The book is written in a style that makes it easy to read. It is not at all dry as some textbooks can be. I recommend this book to anyone who wants an overview of Egyptian history and look forward to reading other books in the series.
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Reviewed in the United States on August 2, 2022
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Alexander King
Los Angeles, US
★★★★★ 5
It’s excellent
Format: Paperback
My dad loves this book. I’m glad I got it for him
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Reviewed in the United States on March 27, 2026
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Strawberry Girl
New York, US
★★★★★ 3
Far from enthralling, but I did learn
Format: Paperback
This book was a disappointment. It looked like exactly what I was looking for: an overview of the history, society, and culture of Egypt from ancient to modern times that wasn't 500+ pages long. I did learn a fair bit of information, but unfortunately, the book is far from "enthralling." It reads like a high school student's book report. In addition, it sometimes just throws terms out there with no explanation, and I found myself having to consult Google. For example, it says "Since hieroglyphs were difficult to create, the Egyptians developed hieretic writing, which was a type of cursive script. Later, demotic writing was developed for ordinary documents." What is demotic writing? How is it different from hieretic? The book doesn't even provide a picture. I had to go to Wikipedia to find out what these things are. This book needs slightly more detail and an author with better writing style / storytelling abilities. That said, it still may be the best short introduction available.
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Reviewed in the United States on August 6, 2024

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