Lab.gruppen C 28:4 700W 4 Channel Power Amplifier

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Lab Gruppen C 28:4 700W 4 Channel Power Amplifier

Description

Details

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 × 700W 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 100/70V 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.

Features

Features

Unprecedented power density – Total output of 2800W (4 ohms) in a 2U cabinet
Four channels – All channels bridgeable for 2- or 3-channel configurations
Lo-Z or Hi-Z (70V / 100V) – Selectable per channel, normal or bridged
Patented Class TD® amplifier topology
Voltage Peak Limiter (VPL) – Configurable per channel to optimize each output for connected loads
Phoenix-type input connectors
Screw terminal output connectors
Comprehensive protection and warning – Excessive output current, DC, high temperature, very high frequency (VHF), short circuit, open load, mains fuse protection, and soft start
Efficient and uniform Intercooler® cooling
NomadLink® network ready

Specification

General
Number of Channels	4
Peak Total Output all Channels Driven	2800W
Peak Output Voltage per Channel	141V
Max. Output Current per Channel	12 Arms
Max. Output Power
16 ohms	Per ch. (all ch.’s driven) : 600W; Bridged per ch. :1400W
8 ohms	Per ch. (all ch.’s driven) : 700W; Bridged per ch. :1200W
4 ohms	Per ch. (all ch.’s driven) : 700W; Bridged per ch. :600W
2 ohms	Per ch. (all ch.’s driven) : 300W
Hi-Z	Per ch: 700W (70V rms / 100V peak); Bridged per ch.:1400W (140V rms / 200V peak)
Performance with Gain: 35 dB and VPL: 100V
THD 20 Hz - 20 kHz for 1W	<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 (1W into 8Ω) +0/-3 dB	6.8 Hz - 34.2 kHz
Input Impedance	20k Ohm
Input Common Mode Rejection, CMR	50 dB
Output Impedance @ 100 Hz	30m Ohm
Voltage Peak Limiter (VPL), Max. Peak Output
VPL, Selectable per Ch.	141, 118, 100, 85, 71, 59, 50, 42V
VPL, when Bridged	282, 236, 200, 170, 142, 118, 100, 84V
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
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
Power
Operating Voltage, 230V / 115V Nominal	130 - 265 / 65 - 135V
Minimum Power-Up Voltage, 230V / 115V	171V / 85V
Power Average Limiter (PAL)	Yes
Soft Start / Inrush Current Draw	Yes / max. 5 A
Mains Connector	230V CE: 16 A, CEE7; 115V ETL: 20 A / NEMA 5-20P
Dimensions (H x W x D)	3.46" (88 mm) x 19" (483 mm) x 13.5" (343 mm)
Weight	26.4 lbs (12 kg)

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