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)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 17440818437

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4.7 ★★★★★
Based on 11 reviews
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Stacy
Omaha, US
★★★★★ 5
Best Handbag Iv ever Purchased from Amazon
Size: Large, Color: 2-croco Purple
I was a scrolling to purchase a new Handbag. Many of my Handbags were ruined in my storage due to a water leak and mold damage. So feeling sorry for myself a new handbag just may cheer me up. I saw this BEAUTIFUL handbag and looking at hundred’s of bags on Amazon. Then after close inspection on this particular handbag I really liked I realized it’s the exact same handbag Iv been using the past several years. Lol 😂 Mine is now a bit worn and starting to show which after 2-3 years of continual and I have a tendency too be hard on my handbags. It’s super easy to wear on my arm or just by the very sturdy handle. It holds up to the weight of all my things So it’s time for several new ones now that my collection has been destroyed. I have to say I still LOVE this handbag. The Color, Style and multiple pockets organizes my belongings. It’s just and Amazing handbag and the price point is great an absolute plus. It stacks up to other high priced brand names. Even after being well worn I still receive compliments on this handbag. Now the decision do I buy it again since Purple is my favorite color or maybe get it in a different color. Maybe Red for the holidays or Black for versatility? Still purple is my favorite. I’ll never be able to decide but if you’re considering a new handbag I’d give this one a try you won’t regret it. Enjoy 👜
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 23, 2025
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Verified Purchase
Jp0593
Birmingham, US
★★★★★ 5
Beautiful presentation and great quality! 👜✨
Size: Large, Color: 1-black/Beige+red, Size: Large, Color: 1-black/Beige+red
This handbag really exceeded my expectations. The presentation was beautiful, and the material feels high-quality and durable. I especially love the small pouch that comes with it — I used it for a quick meeting with just my essentials inside, and it looked elegant and simple on its own. The larger bag has plenty of space, the stitching looks well done, and the overall design feels very sturdy and stylish. It’s a great set that you can use for everyday wear or for quick outings with the small pouch. I’m very happy with this purchase!
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Reviewed in the United States on November 28, 2025
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Verified Purchase
Roxanne
Charlottesville, US
★★★★★ 5
Spacious n elegant
Size: Large, Color: 2-croco Purple
Beautiful bold color, I got lots of compliments. It has lots of space also
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Reviewed in the United States on April 25, 2026
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Aundine
Grantham, US
★★★★★ 4
Study and Attractive, but limited space.
Size: Large, Color: 3-ostrich Purple
I've owned it since Sept 2025 and used it about three times. The Pros are that it's a really rigid purse, like luggage. It doesn't collapse, which probably means it can handle a roughing up. (I'm not hard on my purses.) Another pro is that it's VERY attractive. I got the purple and it was quite elegant. The cons are that things don't fit into it smoothly. There's a zip pocket in the middle of the purse which is cumbersome. And though it fits a lot, there's a lot of work to configure it.
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Reviewed in the United States on February 18, 2026
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C. Wilson
Bozeman, US
★★★★★ 5
Great Company and BEAUTIFUL purse
Size: Large, Color: White Floral, Size: Large, Color: White Floral
I wrote the following review. I changed from 2 starts to five stars. The company reached out to me and offered to rectify the problem. I am very IMPRESSED!!! I will say that a stranger thought it was a Dooney and Bourke!!! "I love this purse and have received many compliments on it. However, one of the pins holding the handles fell out somewhere. I tried to work with Amazon to get a new pin for it, but because I received it in March, they cannot do anything. I will use a paper clip to hold the handle, but obviously it will not look like a purse anyone would want to purchase. I expected it to last at least through the summer."
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Reviewed in the United States on May 16, 2026

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