LAB GRUPPEN C 68:4 เพาเวอร์แอมป์ Total output of 6800 W (4 ohms) in 2U
• Unprecedented power density – Total output of 6800 W
(4 ohms) in 2U
• Four channels – All channels bridgeable for 2- or 3-channel
configurations
• Lo-Z or Hi-Z (70 V / 100 V) – 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
An Installation Amplifier without Compromise
Installed or on tour, uncompromising quality begins with superior sound. Over the past decade, the sound of Lab.gruppen amplifiers has earned praise from renowned FOH engineers and owners
of the world’s premier sound rental companies. At the core of
the C Series high-power* model’s tight and transparent sound is
patented Class TD technology. As a proprietary implementation of
tracking Class D, Class TD approaches the exceptional efficiency of
Class D while retaining the superior sonic quality of the best Class B
output stages.
A Regulated Switch Mode Power Supply (R.SMPS) contributes to
the remarkable efficiency of the C Series high-power models, while
at the same time providing stable operation even with wide fluctuations in mains voltage. R.SMPS also works in conjunction with Class
TD to give extraordinary power density. More channels with more
power are condensed into a smaller package, allowing C Series amplifiers to minimize rack space requirements and reduce installation
costs.
Extreme power density demands efficient cooling, and here
Lab.gruppen’s Intercooler® proves remarkably effective. Thousands
of small copper cooling fins dissipate heat, and all output devices are
mounted on one row perpendicular to airflow for uniform cooling.
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 one
massive subwoofer or a series of small 100 V loudspeakers. VPL
works in combination with adjustable input gain to achieve maximum
headroom regardless of input levels or output impedances.
To assure reliability, and minimize service interruptions, C Series
amplifiers offer comprehensive warning and protection features.
Whenever faulty wiring, improper use, or extreme ambient temperatures threaten trouble, a C Series amplifier gives clear and accurate
warning indications. Protection measures are inserted only when
dangerous thresholds are passed. Conditions are re-checked at
six-second intervals, and normal operation resumes when measurements return to nominal.
Every C Series amplifier 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. (NomadLink® requires
the separate NLB 60E NomadLink® Bridge & Network Controller.)
Specifications C 68:4
General
Number of channels 4
Peak total output all channels driven 6800 W
Peak output voltage per channel 141 V
Max. output current per channel 24.5 Arms
Max. Output Power 16 ohms 8 ohms 4 ohms 2 ohms Hi-Z
Per ch. (all ch.’s driven) 650 W 1200 W 1700 W 1200 W 1600 W (70 Vrms / 100 V peak)
Bridged per ch. 2400 W 3400 W 2400 W n.r. 3200 W (140 Vrms / 200 V peak)
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. 3) 141, 118, 100, 85, 71, 59, 50, 42 V
VPL, when bridged 3) 1) 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) 1)
– 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
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
