Product Specification Sheet APS191

Rev. 03/2017

TTU-3 Counter Top 2-Way Talk-Thru Communications System

TTU-3 Counter-Top 2-Way Talk-Thru
Electronic Communication System
Mounting Details
Mechanical Specifications

Outside Assembly: Machined aluminum, anodized finish, tamper-resistant
Inside Assembly: 
Machined aluminum, anodized finish, tamper-resistant 
Dimensions: Stand. Model: 2.375" H x 6.00" W x 2.375" D 
Opt. Model: 2.375" H x 12.50" W x 2.375" D
(Specify when ordering if you need this size - otherwise standard model is shipped)

3.50 lbs.
Panel Controls: 
Listen volume, talk volume, power on-off, LED power indicator

The Ideal Counter-Top Communication System

Where It is Impractical to Cut a Hole In the Barrier

There are times when its impractical - for various reasons - to cut a 3- to 4-inch hole through an isolation barrier. But your employees and your customers still have a way to communicate - clearly, calmly. In such cases, the Alpha Communications®/Norcon TTU-3 is the communication system of choice. The prismshaped units of the TTU-3 are ideal for mounting on a countertop on both sides of a barrier. Yet they allow free communication through barriers typically found in banks, cashier's booths, information booths, and similar environments.

How It Works...

The TTU-3 incorporates the same high-quality electronics as the basic (Norcon) patented model TTU-1 Talk-Thru system. It is a duplex system, enabling the attendant and the customer to talk and listen simultaneously. 

The TTU-3 provides clear communication even in environments with high ambient noise, shaping the sound for maximum intelligibility. Its compression circuitry decreases loud, annoying sounds.

How To Install...

The TTU-3 comes ready to operate. The prism units are quickly and easily mounted on the counter-top on opposite sides of the barrier. They can be positioned back-to-back (as shown) or randomly. The unit with the gooseneck microphone and controls goes inside the booth; the unit without controls is mounted outside the booth. There are two ways to install the TTU-3: either run the cable between the units through a small hole in the barrier, or under the counter-top (as shown on next page).

The TTU-3 uses a continuous-duty, 117-Volt AC power supply which is stepped down to 12 Volts.

  • Clear, 2-way hands-free voice communication (duplex).
  • Quality electronic design and engineering.
  • Rugged, tamper-resistant materials.
  • Simple, one-person installation. No need to cut a hole in the barrier.
  • Compact, contemporary design. Fits any decor.
  • Avoid shouting, repetition, misunderstanding.
  • 220VAC Export models available (ask for details).
  • Made in U.S.A. 

Talk-Thru systems are shipped complete with mounting hardware, instructions, and 120VAC (primary) power supply (for AC operated units) or charger (for battery operated units).

Electrical Specifications

Audio Frequency Response:  Selectively shaped for maximum voice intelligibility
Audio Power:
2 watts per amplifier
Less than 2%
Listen Mode:
20 dB compression
Talk Mode:
Duplex (VOX)
Low-Z dynamic and electret
Power Supply:
Input: 120 VAC, 60 Hz, Output: 15 VDC, 175mA
Alpha Communications
42 Central Drive • Farmingdale • NY • 11735-1202 • Phone: (631) 777-5500 • Fax: (631) 777-5599
TOLL-FREE: (800) 666-4800 • Web: • Email:
Copyright© 1998-2020 Alpha Communications® - All Rights Reserved.
Talk-Thru™ is a registered trademark of Norcon Communications Inc.
Due to continuous product improvement, all colors, sizes, materials, finishes and specifications are subject to change without notice.