Contract 400 NI
400W Class AB 6 Zone Mixer Amplifier
Product at a Glance
The British Acoustics Contract 400 NIis a reliable 6-zone Class AB mixer amplifier delivering 400W at 4Ω and 250W at 8Ω, with support for 70V/100V systems. It offers flexible input options including 2 mic, 2 aux, USB, wireless, siren, and control ports, suitable for paging, emergency alerts, and media playback. Featuring bass, treble, master controls, LED metering, peak limiting, and protection circuits, it ensures safe operation. Housed in a black aluminium chassis with a brushed steel front, it provides individual volume controls, zone mute buttons, siren/chime triggers, and priority switching. Ideal for retail, transport, schools, and offices, it delivers practical power with smart zoning.
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
• 1 Channel, 6 Zones
• 250W/ Ch @ 8Ω
• 400W / Ch @ 4Ω
• 400W / Ch @ 2.7Ω
• 400W / Ch @ 100V
• 400W / Ch @ 70V
AMPLIFIER INPUTS
• 1 x Priority Mic Input
• 2 x Mic Inputs
• 2 x Aux Inputs
• 1 x USB Input
• 1 x Wireless Input
• 1 x Siren
• 1 x Fireman"s Mic Input
• 1 x Siren Control Input
• 1 x Paging Network Input
AMPLIFIER OUTPUT
• 1 x Direct Output for 100V/70 or Low-Z
• 6 x Individual Zone Outputs
CONNECTORS
• Euroblock Connectors for Direct & Signal
Outputs
• TRS Jack Connectors for Mic Inputs
• USB-A Type Media Input
• Cat 6 Connection for Paging
SYSTEM
SPECIFICATIONS
• Input CMRR > 60 dB
• Freq. resp.: 20Hz - 20kHz ±3dB
• THD : better than 0.1% (1 kHz)
• THD : better than 0.21% (FR)
• Nominal system gain: 27 dB
• Input Impedance — 20kΩ
• Signal Limiters Present
• Protection Against Short Circuit & DC
Outputs Peak Limiting
• Mains In-rush Control present
CONTROLS &
MONITORING
• Bass, Treble & Master Controls
• LED Strip for Output Metering
• 3 x Mic, 2 x Aux & 1 x Media Volume
Control Knobs
• Mute Buttons for Zones 1-3 & Volume
Control Knobs for Zones 4-6
• Media Selection & Playback Controls
• Chime, Alert & Siren Trigger Buttons
• Vox Switch for Priority Input
POWER CONSUMPTION
• 1A Power Consumption, Nominal @ 240V,
4 Ohms
• 2A 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
AESTHETIC SPECIFICATIONS
• White Aluminum Chassis
• Matte Star Silver Front Pane
SIZE
• Product : 88 x 482 x 458 mm (H x W x D)
• Product : 3.4 x 19 x 18 inch (H x W x D)
• Packed individually
WEIGHT
• Net : 11 Kgs
• Net : 24.2 Lbs
SHIPPING INFORMATION
• Carton Size
163 x 556 x 533 mm (H x W x D)
6 x 22 x 21 inch (H x W x D)
• Gross Weight : 13 Kgs / 28.7 Lbs
• Packed : Individually
DOWNLOADS CENTRE
Datasheet Contract 400 Ni
DWG Drawing Contract 400 Ni
PDF Drawing Contract 400 Ni
Contract 400 Ni User Manual
