Grommes GT250C 250 Watt 7-Input Mixer/Amplifier

Powerful, Reliable Commercial Mixer Amplifier for Installed Sound

The Grommes GT250C is a 250-watt RMS, 7-input mixer amplifier designed for professional public address and commercial audio applications. Part of the trusted GTC Series, the GT250C delivers high-output performance, flexible input options, and dependable operation for churches, schools, industrial facilities, and event venues.

Built with a toroidal power transformer for improved efficiency and reduced noise, this rack-mountable amplifier provides clean, stable audio in demanding installed sound environments.

Flexible 7-Channel Input Configuration

The GT250C supports a wide range of input sources:

• Up to 5 microphone inputs (XLR or screw terminal)

• Up to 6 auxiliary line-level inputs

• 600-ohm telephone/tel-page input

• Voice or signal-activated muting

• +15V phantom power for condenser microphones

This flexibility makes it ideal for paging systems, background music, multi-microphone setups, and integrated commercial audio systems.

250 Watts of Continuous RMS Power

Delivering a full 250W RMS, the GT250C supports:

• 4–8 ohm speaker loads

• 25V and 70.7V distributed audio systems

• Dual auxiliary line output (1V @ 4.7k ohm)

• Pre-amp output (1V @ 600 ohm)

This makes it perfect for large distributed speaker systems in warehouses, schools, churches, and commercial facilities.

Professional Sound Control & Integration

• Wide-range bass and treble tone controls

• Tamper-resistant front-panel controls

• Pre-amp output and power amp input for system expansion

• Rack-mountable (2U) with included rack ears

• Toroidal transformer for reduced hum and improved efficiency

  Grommes GT250C Key Features

• 250W RMS commercial mixer amplifier

• 7 total input channels

• 70V / 25V / 4–8 ohm output capability

• Voice/signal activated muting

• +15V phantom power

• Toroidal transformer for low noise

• Rack-mountable 2U design

• 7-year warranty

GT250C Specifications

Power Output (RMS): 250W
Mixing Channels: 7

Outputs:

• 4–8 ohm

• 25V / 70.7V line

• Dual aux line: 1V @ 4.7k ohm

• Pre-amp: 1V @ 600 ohm

Frequency Response:

• Microphone: ±3dB 60Hz–15kHz

• Line: ±3dB 50Hz–20kHz

Input Sensitivity:

• 5 Mic: 1mV @ 600 ohm balanced

• 1–6 Aux: 100mV @ 10k ohm unbalanced

• 600 ohm / Tel-Page: 100mV @ 600 ohm

Phantom Power: +15V
Rack Space: 2U (rack ears included)
Dimensions (W x H x D): 17" x 3.5" x 13.5"
Weight: Approx. 19 lbs

Ideal Applications

• Churches and houses of worship

• Schools and educational facilities

• Warehouses and industrial buildings

• Retail stores and commercial spaces

• Paging and background music systems

• Public address systems