Glass Mounted System STS-K021

The STS-K021 Window Intercom System provides clear communication for applications where there is a hole in the glass. This robust system overcomes communication barriers caused by glass, security screens or similar partitions.
The kit features a STS-BL0, a glass mounted, all-in-one speaker and microphone customer unit. It allows for simple installation and ensures both the customer and staff can be clearly heard.

This kit is available in two other ballistic rated variations STS-K022 (Level 3 UL 752 Ballistic Rated) and STS-K023 (Level 8 UL 752 Ballistic Rated).

COMPONENTS

  • STS-A31H, Hearing Loop and Duplex Audio Communication Amplifier
  • STS-SU1-3W-SIL-400, Staff Unit Speaker and Microphone
  • STS-BL0, Customer Speaker and Microphone Unit (Non Ballistic Rated)
  • IL-AE98, Window Mounted Hearing Loop Aerial
  • PS-55, Power Supply

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Product Sheet
Installation Instructions

Applications

Perfect for settings where clear one-on-one communication is essential, such as: 

  • Banks
  • Post Offices
  • Theaters
  • Information Centers
  • Public Transit Systems
  • Ticket Counters
  • Embassies
  • Government Buildings

Standards

  • CE, ROHS and WEEE compliant
  • BS EN 60118-4, in correct installations

Physical Data (Boxed)

DIMENSIONS & WEIGHT

Height:
5.90”
Width:
20.40”
Depth:
12.50”
Weight:
6.4 lbs

CONSTRUCTION

Metalwork:
Mild Steel
STS-A31H:
ABS Plastic Housing

FINISH OPTIONS

Powder Coated:
Silver Sparkle

Physical and Technical Data (Individual Parts)

STS A31 Hearing Loop and Duplex Audio Communication Amplifier

PHYSICAL DATA

Height:
4.63”
Width:
4.50”
Depth:
1.58”
Weight:
0.32 lbs
Construction:
ABS Plastic Housing
Finish:
Matt Black, Fine Texture

TECHNICAL DATA

Supply Voltage:
12-14 VDC
Quiescent Current:
100mA typical
Operating Current:
2A typical on speech peaks
Power Switch:
Push on – push off (tact switch under membrane)
Microphones:
Electret, supply 5V via 2.2K load resistor
Speaker Output Power:
RMS: 2.5W / 8 Ω 4.4W / 4 Ω
Loop Drive Compliance:
Constant current, bounded by 4V RMS & 3A RMS
Total Harmonic Distortion:
<5% (loop and speakers)
STS-SU1-3W-SIL-400 Staff Unit Speaker and Microphone

PHYSICAL DATA

Height:
18.50”
Width:
3.80”
Depth:
6.02”
Weight:
1.79 lbs
Construction:
Mild Steel
Finish:
Silver Sparkle

TECHNICAL DATA

Speaker

RMS:
5W
Impedance:
4 Ω
Output:
SPL 1W @ 1M 85dB
Frequency Resonse:
150Hz – 10300Hz

Microphone

Directional Response :
Cardioid
Sensitivity:
49.5dB+ 2dB @ 1kHz (0dB=1V/pa)
Impedance:
1.6K Ohms+ 3-% @ 1kHz
Frequency Response :
150Hz – 10500Hz
STS-BL0 Customer Speaker and Microphone Unit (Non Ballistic Rated)

PHYSICAL DATA

Depth:
4.84”
Diameter:
5.51”
Construction:
Mild Steel, SR500 Steel
Finish:
Powder Coated Silver Sparkle

TECHNICAL DATA

Microphone
Directional Response:
Omnidirectional
Sensitivity:
-44 ±3dB @ 1kHz
Impedance:
1.0k +/- -30%
Frequency Response:
100Hz – 10,000Hz

Speaker

RMS:
5W
Output:
SPL 1W @ 1M 85dB
Impedance:
4 Ω
Frequency Response:
150Hz – 10,300Hz

 
   
IL-AE98 Glass Mounted Hearing Loop Aerial
Height:
8.50”
Width:
8.50”
Depth:
0.01”
Weight:
0.26 lbs
Connection Cable Length:
6.50ft
PS-55 Power Supply
PHYSICAL DATA

Height:
1.38”
Width:
2.08”
Depth:
3.92”
Cable Length:
70.87”
Weight:
0.50 lbs
Construction:
ABS Case
Finish:
Black
 TECHNICAL DATA

Input:
100-240V 50-60Hz 1A max
Output:
14V 2.14A 30W max

Alternative Solutions

Glass Mounted System STS-K022

Specifically designed to retrofit into a window with a hole in the glass
STS-K035

Curved Microphone System STS-K035

Features individual speaker and microphone units for the customer-side

Glass Mounted System STS-K021

Specifically designed to retrofit into a window with a hole in the glass
Dual Loudspeaker Pod System
STS-K073

Dual Loudspeaker Pod System STS-K073

Ensures clear sound through partitions with mounted or free-standing pods, perfect for medium-noise ...
Curved Microphone System STS-K035

Bridge Bar System STS-K001

Perfect for natural speech with a microphone in the center and speakers on either side
Overhead Speakers & Anti-Vandal Mic System STS-K064

Overhead Speaker and Microphone System STS-K064

Features microphone, overhead speaker, combined microphone and loudspeaker unit for staff

Glass Mounted System STS-K023

Specifically designed to retrofit into a window with a hole in the glass
Glass Mounted System STS-K020

Glass Mounted System STS-K020

Specifically designed to retrofit into a window with a hole in the glass

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