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ISP 4500 Series
The 4500 is a solid state digital message repeater designed to inject messages over a background music feed. The messages are loaded into the unit through the cassette tape drive or a telephone handset. The unit accepts a live music feed, and then mixes the stored messages with the music feed. The 4500 can store two zones of messages that output at two different time intervals. Most commonly used as In-Store messaging and On-Hold messaging, the In-Store zone or zone two can also output daypart messages that play at a specified time of day.

Flash Memory-The 4500 is equipped with the most advanced memory. The (NAND) flash memory assures the unit retains the messages and a program settings in the event of a power interruption.

Automatic Mixing-The 4500 automatically mixes messages with background music from a live feed. Messages can be tape loaded or handset loaded.

Re-Recordable Messages-Messages can be erased and rerecorded into any message position. New messages can be any length you want. The on board microprocessor realigns the memory for maximum efficient memory usage.


  • Dual zone output (independent in-store and on-hold zones)
  • Telephone on hold messaging
  • In store promotion messaging
  • Dayparting / time of day triggered messages (play messages at a specific time of day)
  • Automatic mixing (messages mixed with background music)
  • Music pass through (live music shared across both zones)
  • Flash memory (NAND)
  • Background music (fade or turn off music when messages are played)
  • Re recordable messages

ISP 4500 Technical Specifications

Recording Time4, 8, 16, 24, and 32 Minutes
Message CapabilityZone 1 - MOH - 12 messages
Zone 2 - ISP - 21 messages
Zone 2 - Trigger/Timed - 12 messages
Memory TypeNAND Flash Memory, non volatile (holds all programming in memory until user makes a change)
Frequency Response/ BandwidthMessages - 200 Hz to 8 KHz
Music - Same as external music source
8 Ohm output (MOH)8 Ohm and 5 Watt (RCA type connector)
600 Ohm output (MOH)600 Ohm output for “line-in” connection to amplifier (RCA type connector)
"Line-Out" (ISP)RCA type connector
Music Input"Line-Out" type connector from music source (RCA type connector)
Handset InputCarbon Handset

4500 PDF

  • ISP 4500 Product Brochure
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