120W IP Network Power Amplifier with Integrated Decoder
100V / 4-16Ω Output • 3.4" LCD • USB Playback • EMC Priority • Master/Standby Redundancy
T-77120B
120W of reliable IP amplification for mid-size zones. The T-77120B is a 120W member of the T-7700B series, combining a professional-grade power amplifier with an integrated IP network decoder. Perfect for classroom wings, restaurant dining areas, retail floors, and office zones requiring clean, dependable audio with network connectivity.
| Model Number | T-77120B |
| Product Type | IP Network Power Amplifier with Integrated Decoder |
| Output Power (RMS) | 120W @ 100V / 100W @ 4-16Ω |
| Form Factor | 2U, 19" Rack Mount |
| Display | 3.4-inch LCD (Character/Graphic) |
| Network | 10/100Mbps Ethernet (RJ45) |
| Audio Protocols | TCP/IP, UDP, HTTP, RTP, RTSP |
| Audio Codecs | MP3, WAV, PCM |
| Frequency Response | 80Hz – 16kHz (±3dB) |
| THD+N | < 0.5% (1kHz, rated power) |
| S/N Ratio | > 85dB |
| Input Sensitivity | MIC: 5mV, AUX: 300mV |
| USB Playback | USB 2.0, FAT32, MP3/WAV |
| Priority Control | EMC input (contact closure), highest priority |
| Redundancy | Master/Standby switch, <0.3s failover |
| Cooling | Variable speed fan, front-to-rear airflow |
| Protection | Overload, short circuit, over-temperature, DC fault |
| Power Supply | AC 100-240V, 50/60Hz, internal |
| Dimensions (WxDxH) | 483 x 340 x 88 mm (2U) |
| Weight | 10.2 kg |
| Operating Temperature | 0°C – 40°C |
| Humidity | 10% – 90% non-condensing |
| Certifications | CE, FCC, RoHS |
The T-77120B features master/standby redundancy. When paired with a second T-77120B, failure of the primary unit triggers automatic switchover to the backup in less than 0.3 seconds. Ideal for emergency systems, hospitals, and critical communication zones.
The T-77120B is a 120W IP network power amplifier that integrates a high-efficiency Class-D amplifier with an ITC network audio decoder in a single 2U rack chassis. It is designed for mid-size commercial sound applications where reliable network audio and amplification are required in one unit.
All-in-One Solution: By combining decoding and amplification, the T-77120B eliminates the need for separate components. It receives streaming audio directly from the T-7700 series server and drives 100V speaker lines or low-impedance speakers without any additional equipment.
120W Power for Mid-Size Zones: With 120W of clean power, this amplifier is ideal for spaces such as:
Local Media Playback: Front-panel USB port enables direct playback of MP3/WAV files from USB drives. This provides background music capability independent of network server availability.
Emergency Priority: The EMC input has absolute priority, automatically muting all other sources when triggered – essential for fire alarm integration and emergency paging.
No external decoder required. Receives network streams directly from server. Reduces rack space and simplifies wiring.
Dual-mode output: 100V constant voltage for distributed speakers, plus 4-16Ω for direct drive of horn speakers and subwoofers.
Master/standby redundancy with <0.3 second switchover. Hot-standby mode keeps backup amplifier synchronized.
Front-panel USB port for background music or emergency messages. Plays continuously or scheduled via server.
| Parameter | Specification |
|---|---|
| Configuration | Two identical amplifiers, one master, one standby |
| Detection Method | Audio presence, power supply monitoring, heartbeat |
| Switchover Time | < 0.3 seconds (typical) |
| Switchover Type | Automatic, manual override |
| Standby Mode | Hot standby - amplifier powered, audio synchronized |
<0.3s failover
Seamless redundancy
• Overload: Automatic output limiting, recovers when load normalizes • Short circuit: Instant shutdown, auto-retry every 5 seconds • Over-temperature: Fan speed increases, output attenuates at 85°C, shutdown at 95°C • DC fault: Output relay disconnects if DC detected • Soft start: Prevents inrush current
| Speaker Load | Recommended Model |
|---|---|
| 1-15 speakers (small office) | T-7700B (60W) |
| 15-30 speakers (classroom wing) | T-77120B (120W) |
| 30-60 speakers (retail floor) | T-77240B (240W) |
| 60-90 speakers (school gym) | T-77350B (350W) |
| 90-130 speakers (factory) | T-77500B (500W) |
| Model | Power | Zone Outputs | Redundancy | Form Factor | Best For |
|---|---|---|---|---|---|
| T-7700B | 60W | 1 zone (100V) | Master/Standby | 2U | Small zones |
| T-77120B | 120W | 1 zone (100V) | Master/Standby | 2U | Mid-size zones |
| T-77240B | 240W | 1 zone (100V) | Master/Standby | 2U | Large zones |
| T-77350B | 350W | 1 zone (100V) | Master/Standby | 2U | Gyms, auditoriums |
For 100V systems, calculate total speaker tap wattage, then add 20% headroom. Example: 20 speakers at 5W each = 100W total, so T-77120B (120W) is ideal. For mixed 100V and low-impedance loads, consult ITC engineering support.
To configure redundant amplifier pair: Set both units to same network zone. Connect Master/Standby control cable (supplied) between units. Set one unit to MASTER, other to STANDBY. Test failover by disconnecting master speaker output. Switchover occurs in <0.3s.