SKU: 75351269498

Pro Intercom AD920 Balanced/Unbalanced Interface Adapter

Sale price$135.90 Regular price$151.00
Save 10%

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

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

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.7 ★★★★★
Based on 2075 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
M
Verified Purchase
Mrs. H.
Houston, US
★★★★★ 3
Came apart.
Color: Cherries
We were playing with it and the green part pulled off of the red part. I'm pretty sure that is not supposed to happen. I took the green part away from the dog because that part is too small for my pup to play with. But we continue to play with the red part. My dog likes the texture and the bounciness.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 26, 2026
N
Verified Purchase
Navigator65
Alexandria, US
★★★★★ 1
Caution - handle comes off!
Color: Cherries
I really liked this toy when I opened package--our dog liked as well! Until a short time ago when I saw her chewing on the green "stem"! The stem had come apart from the main cherries. This is a small enough part that I think she or any bigger dog could choke on. Our dog is a small lab. Would not recommend buying.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2026
A
Verified Purchase
Amazon Customer
Lowell, US
★★★★★ 5
Sturdy
Color: Bear
Good for dogs that like to chew. Smells like blue raspberry and I was not expecting that
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
S
Verified Purchase
Sara Knickmeier
Massapequa, US
★★★★★ 5
Must buy!
Color: Grape
My dogs love this and so do I. It really smells like “fun grape” like a fun smelling marker. It’s gentle for their teeth and durable! They are both interested in it and take turns using it, pretty awesome!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
S
Verified Purchase
Staci M. L.
Birmingham, US
★★★★★ 5
Great for SuperChewers. Keeps my Golden busy.
Color: Bear, Color: Bear
My dog loves it and it keeps her busy for a while. She actually pulls it out of her toy basket and brings it to me when she wants it filled. I break her treats into some pieces that are easy to get and some a little harder. This way she doesn’t get them too fast or loose interest if they’re harder to get. Also, she’s had it for 3 months and there’s barely a mark on it and she’s still a puppy that chews her toys to pieces.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026

recommand products