SKU: 75351269498

Pro Intercom AD920 Balanced/Unbalanced Interface Adapter

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Description

Pro Intercom AD920 Balanced/Unbalanced Interface AdapterBalanced Unbalanced System Interface Adapter The AD920 Balanced Unbalanced Interface provides impedance matching and signal conversion between a balanced intercom circuit and an unbalanced intercom circuit. Both channels become audio and light signal compatible. Power may come from either intercom circuit or from both simultaneously. This is particularly useful for production crews wanting to use their unbalanced system with a balanced 'house' system.

Balanced / Unbalanced System Interface Adapter

The AD920 Balanced/Unbalanced Interface provides impedance matching and signal conversion between a balanced intercom circuit and an unbalanced intercom circuit. Both channels become audio and light-signal compatible. Power may come from either intercom circuit or from both simultaneously.

This is particularly useful for production crews wanting to use their unbalanced system with a balanced 'house' system. Each circuit to be used will require its own AD920.

There are no user-operated controls. Connection is via clearly marked 3-pin XLR connectors; 1 female, 1 male.

The first intercom systems used in entertainment applications were simply strings of telephone operator headsets strung together in parallel along a pair of wires powered by a set of batteries. There was no individual volume control and no signaling system. As electronic equipment began to be used on the stage and throughout the venues, these systems rapidly became inadequate.

Two very similar looking but quite different standards began to emerge; one finding its dominant market in fixed venues and the other becoming the most popular for systems which were going to go "on the road". The systems for fixed venues took advantage of the thousands of feet of twisted pair telephone wires already built into fixed venues. The other made use of the miles of 2-conductor shielded microphone cable that were required to stage a traveling show, could be strung very casually and even left lying on the ground for short periods. In the U.S. the best known manufacturer of the systems which operated on microphone cable was Clear-Com while the company dominating the twisted pair market was Telex.

The type of wire being used wasn't the real issue, but the differences in the electronics required to take greatest advantage of each wire type. The twisted pairs did not offer the noise eliminating feature of a shield, and therefor had to run in a balanced mode to avoid interference pickup. The 2-conductor shielded microphone cable was much more expensive and rewiring a huge auditorium or sports facility could cost tens of thousands of dollars. However, its shield provided high degree of resistance to interference pickup.

Many manufacturers adopted the Clear-Com unbalanced standard, including Pro Intercom, while Telex"AudioCom" retained its dominancy in the "balanced" market and does so even today. Along the way Telex purchased a company called RTS, which had developed but yet another standard and had captured the motion picture and broadcast markets. Telex and RTS have the same ownership, but only Audiocom uses the balanced standard and most of the newer Audiocom products will operate on either standard. The AD920 does not work with RTS products, only with Telex Audiocom being used in its balanced mode.

In more modern times, the chances of a facility being pre-wired with miles of twisted pairs has diminished in favor of cat5, cat6 or fiber. Even earlier, many huge attractions had begun to appear in both indoor and outdoor environments. That raised the issue of integrating an indoor facility's Telex system with the show's Clear-Com system. They are incompatible in too many ways.

The AD920 resolves that problem. The AD920 is powered by the circuits to which it is attached. It matches the unbalanced line to the balanced line and translates the signal activating voltage of the unbalanced system to the 20kHz tone used for signal activation in the balanced system and vice-versa. There are no controls or adjustments. One AD920 is required for each circuit to be matched.

Specifications

  • Supply voltage: 24~30VDC
  • Current consumption: 10~15mA
  • Impedances: Balanced 600 ohm, Unbalanced 200 ohm
  • Trigger voltage (unbalanced side): 8~12VDC
  • Trigger tone (balanced side): 20kHz
  • Size: 3.70x4.30x2.50in (93.98x109.22x63.5mm)
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: 75351269498

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junebugged
Lowell, US
★★★★★ 1
Not the same rubber.
I just received these today. I already have two of the same size direct from the local pet store. The one thing I liked about them that made me want to buy more - my 13lb dog could chew on them all night and never leave a mark. The red one I received was as expected. The blue one I received was not made out of the same rubber. It was softer. We played catch a few times and it didn’t bounce the same. I looked away for 5 minutes and she had it already starting to shred. Not sure what happened but 1 of the 2 balls I was sent was not up to par, possibly defective.
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Reviewed in the United States on May 23, 2024
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Verified Purchase
Amy L
West Palm Beach, US
★★★★★ 5
Best ball toy I have found
Size: Small
This is my dog’s absolute favorite. I bought this one as a replacement. Finally after years of use one of the tiny ribs gave way. Ball is still completely useable, but got another. She chomps down on it constantly, tears at it, shakes it in her mouth. It is extremely durable. One of the great things about this ball is how ‘soft’ it is. Meaning the way it’s constructed makes it have a lot of give. The texture of the ball itself is firm, but the amount of ‘airiness’ means you can throw it inside your home, against walls, furniture, etc without worrying about any damage. Great toy inside and outside. Highly recommended ball toy. They make all different sizes. My dog is 25 lbs and loves both the 3” and the mini. The mini ones are the same size as mini tennis balls..problem is she would destroy a mini tennis ball within a day of getting one. She has had the mini Hol-ee Roller for years. Super durable.
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Reviewed in the United States on March 18, 2026
L
Verified Purchase
LJH
Belleville, US
★★★★★ 5
I have a toy dog and she really loves this
Size: Small
however her mouth is very small and she had a difficult time gripping the ball. so I took a pair of scissors and cut out a section to make a bigger hole for her to get her little mouth through and now she has a lot of fun picking it up and playing with it. The ball is well-made and is one of her favorite toys. if I tell her to go get her ball she will even go under the bed and is able to grab it and carry it up the stairs to the bed for playtime. It also makes it easy when we are in the yard when I throw it. It is light enough for her to carry and bring back to me. But, as I said , I did have to adapt it so she could get a grip.
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Reviewed in the United States on November 8, 2025
L
Verified Purchase
Lois
Birmingham, US
★★★★★ 5
Holds up great!
Size: Small
Nice ball for puppies!
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Reviewed in the United States on February 16, 2026
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LaVonne
Grantham, US
★★★★★ 4
Easy to grab and throw!
Size: Medium
Our puppy loves this ball, although it gets stuck on her teeth sometimes, but she gets it off just fine! Easy to play and throw. She has a blast catching it, too!
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Reviewed in the United States on August 20, 2024

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