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Contract 350 RT

2 X 350W CONSTANT VOLTAGE COMPATIBLE INSTALLATION AMPLIFIER

Product at a Glance

The Contract 350RT is a compact and efficient 2-channel amplifier purpose-built for commercial and contractor-grade installations. Offering 350W per channel at 4Ω, this Class-AB amplifier delivers clean, controlled output suitable for background music systems, paging applications, and mid-scale public address zones. What sets the 350RT apart is its high and low impedance adaptability—supporting both 70V distributed audio systems and standard 8Ω/4Ω speaker setups, making it ideal for versatile multi-zone environments.

With a damping factor of >300, excellent THD performance (<0.18% at 1kHz), and input load protection, it ensures stability and longevity across all installations. Front panel metering, dual rotary volume controls, and a rugged black aluminum chassis with a matte white front panel complete a package built for reliable integration into any professional rack. Simple, functional, and robust, the Contract 350RT fits seamlessly into modern installation workflows.

CRAFTSMANSHIP

Painstakingly Perfect Production

Over the years, craftsmanship has been closely linked with small scale individualistic production. Back in 1972, we started the same way. As we grew in scale & size, it was difficult to build each speaker individually, but quality control was of utmost importance as so switching to a general assembly line was simply not an option. So we wrote up a code, one quite like enigma, to ensure quality control. We selected the right partners, got the right tools, and in cases where those weren't available, we invented them. We grew slower than most as our aim was to last longer than most.

TECHNICAL SPECIFICATIONS

OUTPUT POWER

• 2 Output Channels
• 250W/ Ch @ 8Ω
• 350W / Ch @ 4Ω
• 350W / Ch @ 2.7Ω
• 700W / Ch @ 8Ω􀀀 Bridged
• 1000W / Ch @ 4Ω􀀀 Bridged

AMPLIFIER INPUTS

• 2 x Analogue Inputs

AMPLIFIER OUTPUT

• 2 Link Outputs
• 2 Power Outputs

CONNECTORS

• XLR Connectors for Signal Input and Link
Output
• Speak-on and Binding Post Connectors for
Channel Outputs

SYSTEM
SPECIFICATIONS

• Input CMRR > 60 dB
• Freq. resp.: 20Hz - 20kHz ±3dB
• THD : better than 0.18% (1 kHz)
• THD : better than 0.2% (FR)
• Nominal system gain: 32 dB
• Input Impedance — 20kΩ􀀀
• >300 Damping Factor, 1kHz, 8􀀀Ω
• Signal Limiters Present
• Protection Against Short Cicrcuit & DC
Outputs Peak Limiting
• Input Load Protection

CONTROLS &
MONITORING

• LED Strip for Output Metering
• Rotary Knobs for Channel Volume

POWER CONSUMPTION

• 5A Power Consumption, Nominal @ 240V,
4 Ohms
• 10.4A Power Consumption, Nominal @
120V, 4 Ohms
• See Power Consumption & Thermal
Emission Chart for a detailed specification

OPERATING PARAMETERS

• Operating positions : To be used in a
rack-mount case with no front to back airflow
restriction
• Maximum permitted ambient temperature
(Ta max) 45° C (113° F)
• Minimum permitted ambient temperature
(Ta min): 0° C (32° F)
• 32 dB Fan Noise