SI35A School Intercom

Bogen SI35A Desktop Control Center for School Intercom System (Up to 75 Classrooms)

Model #SI35A

Regular Price: $5,285.65

Special Price $2,774.97

Product Overview

• Cost-effective communication for 25 to 75 rooms

• Remote emergency paging capabilities

• Can be furnished with 1, 2 or 3 room selector panels (each with 25 switches), to accommodate up to 25, 50, or 75 rooms (model SBA225)

• Step-by-step instructions and color-coded guidelines for easy operation

• Instant Emergency and All Rooms announcements

• 20-watt intercom; separate 35-watt program channel

• Provision for time signalling, telco and voice call-in

• Aural and visual monitoring of program material as well as level controls

• Transmit a time tone for classroom change, etc.

• Calls to staff locations are announced by a supervisory tone signal, which repeats at regular intervals to indicate that the channel is open and the room is being monitored

• Classrooms can be equipped with call-in switches to call the control center, with options for privacy to voice call-in

• Emergency All-Call with a single push-button

• Emergency announcements take precedence over all system functions and are transmitted at a predetermined level

• Emergency paging from a remote telephone or microphone

• Teachers converse hands-free with the control center operator over their individual classroom speaker

• A CD player-AM/FM receiver can be installed when system capacity does not exceed 50 stations

• Sturdy desktop cabinet finished in an attractive simulated wood grain finish


The Bogen SI35A Desktop Control Center for School Intercom System provides fast, reliable, efficient intercommunication and tone signalling for small to medium-sized schools. It also counts with emergency announcements and background music options.

The SI35A provides a 20-watt intercom amplifier to permit instant intercommunication with any speaker-equipped location, and a separate 35-watt program amplifier for simultaneous distribution of program material to other rooms or locations.

The system also features an emergency page capability for emergency announcements to all stations at once. The SI35A provides complete facilities for distributing a variety of program materials from optional equipment such as microphones, CD playerAM/FM receiver, or other background music source.


  • Rated Output:
    Program – 35WRMS
    Intercom – 20WRMS
  • Frequency Response:
    Program – +1, -3 dB from 80 Hz to 15 kHz
    Intercom – Shaped for maximum intelligibility
  • Distortion: Less than 1% at rated power and bandwidth
  • Inputs: Two Lo-Z balanced MIC: Hi-Z unbalanced AUX; Telco Page; 25V Booster
  • Output: 25V Balanced line, Line Out to Booster
  • Phantom Power: 15V DC
  • Input Sensitivity:(for rated output)
    Program – MIC Input: 300μV balanced Lo-Z; AUX: 100mV unbalanced Hi-Z
    Telco Page: 100mV unbalanced Hi-Z; Intercom – Listen Mode: 300μV balanced Lo-Z (Console MIC: 1mV unbalanced Lo-Z)
  • Controls:
    Front Panel – Program Selection: MIC 1, MIC 2, AUX; Level: Monitor/
    Listen, Program; Distribution: All Rooms, Emergency, Press To Talk;
    Indicators: Program Talk/ Level LED
    Rear Panel – Input Gain: MIC 1, MIC 2, AUX, Telco Page, Talk, Listen
    Internal – Gain: Emergency Page, Supervisory Tone, Time Tone
    Enable/Disable: MIC 1/Console MIC; MIC 2/Telco Page, Phantom Power,
    Supervisory Tone, MIC 1/Monitor Mute
  • Tone Specifications: Time Tone – 750 Hz
    Supervisory Tone – Repeating, 500 Hz
    Call-in Tone – Repeating; oscillates between 500 Hz and 750 Hz (Switching Freq., 16 Hz)
  • Power Requirements: 120V AC, 60 Hz, 100W maximum
  • Dimensions: 20-1/2" W x 12" H x 11" D (with sloped top)
  • Cabinet: Simulated wood grain finish
  • Panels: Black with color-coded lines and instructions for Intercom, Program, Emergency Page
  • Product Weight: 29 lb.
  • Operating Temp.: 0-130° F
  • Accessory Equipment: CDR1 – CD player and AM/FM Receiver
    SCR25A – Call-in module (for switches w/o SCR)
    SBA225 – Three-Channel (Program A, Off 0, Intercom C), 25-Station Switchbank
    WMT1A – Line-matching transformer for telephone paging
    TAMB2 – Telephone access module for telephone paging
    DDU250, MBS1000A – Desktop paging microphones
    CA10A, CA11A, CA17 – Call-in switches (2-pos., 3-pos., and push-button, respectively)
    TWK351 – 2-Wire call-in adapter kit
    2518, 2520, 2522 – Connector Kits (18-, 20-, and 22-gauge respectively)
    TL156 – Insertion Tool for connector kits

Additional Information

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