Overview

C SERIES C 28:4

The C 28:4 is One of Two Mid-Power, Four-Channel Amplifiers in the C Series Family.

The C 28:4 is one of two mid-power, four-channel amplifiers in the C Series family. Attractively packaged in a 2U chassis, it provides 4 × 700 W output into 4 ohm loads.

C Series amplifiers are uniquely capable of adapting to a wide variety of demanding load conditions. Each channel has an individually configurable Voltage Peak Limiter (VPL™), which allows the output to be optimized for any loudspeaker load – whether a single large subwoofer or a series of small 100/70 V loudspeakers. VPL works in combination with adjustable input gain to achieve maximum headroom regardless of input levels or output impedances.

Every C Series is ready for the NomadLink® network right out of the box. With NomadLink, key amplifier parameters are displayed via DeviceControl software, and remote control of channel mutes and power on/off is under network control.

Product Features

• 2,800 Watt, 4-channel amplifier with up to 700 Watts output per channel and NomadLink network for monitoring and control
• Selectable gain plus scalable Voltage Peak Limiter (VPL) and bridge-mode operation allow custom configuration for any application
• 4 x 300 Watts into 2 Ohms, 4 x 700 Watts into 4 Ohms, 4 x 700 Watts into 8 Ohms, 4 x 600 Watts into 16 Ohms, 4 x 700 Watts into Hi-Z 70 V, 4 x 700 Watts into Hi-Z 100 V
• Proven and reliable Class-TD output stage delivers Class-A/B audio quality with Class-D efficiency
• Regulated Switch Mode Power Supply (R.SMPS) ensures constant power output at all times
• Intuitive DeviceControl software monitors and controls key functions via the NomadLink network
• Comprehensive protection scheme including current, voltage, DC, temperature, short circuit and open load warnings
• Efficient Intercooler copper cooling system dissipates more heat for extended peak output
• 4 x balanced analog audio inputs on 3-pin Phoenix connectors
• 4 x barrier strip 2-pole screw terminal output connectors
• Removable dust filter grille for increased air circulation
• Compact and durable 2U rackmount chassis saves space in install applications

Specifications

General

• Number of channels: 4
• Peak total output all channels driven: 2800 W
• Peak output voltage per channel: 141 V
• Max. output current per channel: 12 Arms

Max. Output Power

• Per Channel: 600W (16 ohms), 700W (8 ohms), 700W (4 ohms), 300W (2 ohms), 700W (Hi-Z, 70V/100V)
• Bridged per Channel: 1400W (16 ohms), 1200W (8 ohms), 600W (4 ohms), 1400W (Hi-Z, 70V/100V)

Performance with Gain: 35 dB and VPL: 100 V

• THD 20 Hz - 20 kHz for 1 W: <0.1%
• THD at 1 kHz and 1 dB below clipping: <0.05%
• Signal To Noise Ratio: >112 dBA
• Channel separation (Crosstalk) at 1 kHz: >70 dB
• Frequency response (1 W into 8 ohms) +0/-3 dB: 6.8 Hz - 34.2 kHz
• Input impedance: 20 kOhm
• Input Common Mode Rejection, CMR: 50 dB
• Output impedance @ 100 Hz: 30 mOhm

Voltage Peak Limiter (VPL), max. peak output

• VPL, selectable per ch.: 141, 118, 100, 85, 71, 59, 50, 42 V
• VPL, when bridged: 282, 236, 200, 170, 142, 118, 100, 84 V
• Voltage Peak Limiter mode (per ch.): Hard / Soft

Gain and Level

• Amplifier gain selectable (all channels) - rear-panel switches: 23, 26, 29, 32, 35, 38, 41, 44 dB
• Default gain: 35 dB
• Level adjustment (per ch.): Front-panel potentiometer, 21 position detented from -inf to 0 dB, hidden behind security panel/dust filter grille

Connectors and switches

• Input connectors (per ch.): 3-pin Phoenix, electronically balanced
• Output connectors (per ch.): Barrier strip 2-pole screw terminals
• Output bridge mode: A+B and/or C+D, inputs A and C are input source
• NomadLink network: On board, 2 x RJ45 connectors
• Intelligent fans (on/off): Yes, depending on presence of output signal
• Power on/off and Remote enable on/off: Individual switches on front-panel
• Cooling: Two fans, front-to-rear airflow, temperature controlled speed

Front-panel indicators

• Common: NomadLink Network; Power Average Limiter (PAL) 2); Power on
• Per channel: Signal present / High-impedance; -10 dB and -4 dB output signal; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL); Very High Frequency (VHF); High Temperature; Fault; Mute

Power

• Operating voltage, 230 V / 115 V nominal: 130 -265 / 65-135 V
• Minimum power-up voltage, 230 V / 115 V: 171 V / 85 V
• Power Average Limiter (PAL) 2): Yes
• Soft start / Inrush Current Draw: Yes / max. 5 A
• Mains connector: 230 V CE: 16 A, CEE7; 115 V ETL: 20 A / NEMA 5-20P

Physical

• Dimensions (W/H/D): W: 483 mm (19"), H: 88 mm (2 U), D: 343 mm (13.5")
• Weight: 12 kg (26.4 lbs.)
• Finish: Black painted steel chassis with gray painted steel front
• Approvals: CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC