LAB 1200C
LAB. GRUPPEN?s LAB 1200C is a four-channel, 370 watts per channel, light-weight power amplifier, designed for 19? rack mounting.
The LAB 1200C gives the opportunity of use in several applications, such as; in multi-channel monitor systems, four channel reproduction, and compact amplification in active 2-, 3-, and 4-way systems.
The LAB 1200C gives the possibility to bridge connect one or two of the two pair of channels (channel A and B and/ or channel C and D). These bridge mode combinations solve most of the problems concerning different impedance?s and maximum power handing of loudspeakers.
The switch-mode power supply is the modern solution of the weight and size problem. With switch technology operating at a high frequency, it is possible to use ferrite transformers instead of heavy iron transformers and large electrolytic capacitors.
Switch-mode technology has been applied in power supplies in TV-sets during the latest 30 years. But in the LAB 1200C the power capacitivity is 10 times larger.
We have designed the LAB 1200C to obtain the same characteristics as a conventional power supply. Thanks to the switch-mode power supply it is easy to get the DC-rail voltage stabilised. This is made by controlling the magnetic energy in the ferrite transformer with a pulse width processor and magnetic ?Flux Sense? windings.
Twenty-four 250 watt bipolar power transistors constitute the output stages, which are totally complimentary. The power transistors are cooled by a solid copper cooler, called Intercooler?, originally designed for our LAB 1300 power amplifier. LAB. GRUPPEN?s specially designed thermal feedback circuit protects against thermal breakdown.
The LAB 1200C is completely short-circuit protected . The LAB 1200C is equipped with LAB. GRUPPEN?s Adaptive Limiting System? short circuit protection, which permits very high peak-currents, but still holds the transistors within the so-called ?Safe Operation Area? at the present operating voltage. This makes it possible to run loudspeakers with impedance variations, which are considerably lower than the lowest permitted impedance of the power amplifier.
Six more protection circuits, which are separate for each channel, protect the LAB 1200C and the loudspeakers: Two DC protections; one DC current limitation protection, supplemented with fuses on each DC voltage power supply rail and one DC voltage protection of Crowbar type, which works by short-circuiting the output to protect the load.
Thermal protection prevents the LAB 1200C from being overheated. The protection indicators on the front panel are switched on, as a warning, before the protection occurs.
VHF protection (Very High Frequency) protects the loudspeakers against strong non-musical signals above the audible area.
Clip limiter prevents severely clipped waveforms from reaching the loudspeakers, but maintains full peak power.
AC protection shuts down the outputs if the line voltage is outside the operating voltage of the LAB 1200C.
All electronics are mounted on six modules. The modules are easily accessible for replacement or repair, etc.
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Used LAB.Gruppen
LAB.Gruppen is a Swedish sound equipment company, based in Kungsbacka, Sweden, dedicated to building mainly public address power amplifiers. It is owned by Music Group which also holds Midas, Behringer, Turbosound, TC Electronics and others. As of 2007 the company had 130 employees.
Kenneth Andersson and Dan Bävholm founded Lab.gruppen in 1979. They first met as schoolboys when they shared an interest in electronics.Andersson and Bävholm's first project was a hand-made mixing console. It was used as part of the Front of House equipment for a concert by Eartha Kitt. They created other mixers and a series of guitar heads and combos. Their intermittent manufacture of mixers and guitar amplifiers continued through the formal establishment of Lab.gruppen in 1979.
The company was located inside a local hi-fi store, where the duo serviced consumer equipment for additional income. It was here that the company's first professional audio power amplifier was created.
Between the LAB 4000 and FP Series 6400, Lab.gruppen engineers continued to advance and refine their products. The LAB Series was overhauled and augmented and subsequently became the FP range. FP designs were upgraded to meet the stringent new EMC standards in Europe, and adoption of UL safety standards allowed them to be sold in the United States. Standardization of internal components between models increased manufacturing efficiency to keep pricing competitive in all new markets.
In the late 1990s, the founders brought in new ownership and a managing director. In July 2000, Lab.gruppen was acquired by the TGI Group of the United Kingdom, and a few months later Tomas Lilja was chosen as managing director.
In early 2002, the TGI Group was acquired by TC Group of Denmark, the current corporate owner. In 2004, the company moved to its new location at Faktorvägen. Both Andersson and Bävholm remained with the company following the acquisitions.
In 1998, Lab.gruppen engineers undertook the long-term development of a new amplifier platform. The complete range would have four bridgeable amplifier channels and an integrated monitoring and control network. The basic technology of both the power supply and output stages was taken from the proven FP range, but with significant upgrades to reduce the number of components required.
Designated the C Series and targeted at the installation market, the first amplifiers of this design were shipped in the summer of 2005. This was followed up by the release of FP+ in 2006 and PLM Series in 2007.
The PLM Series was the first Lake processor with integrated amplification and it as it was embraced by the market Lab.gruppen acquired the exclusive rights to the Lake brand and the Lake processing for professional applications in touring and fixed installations late 2008.
The E Series was the first amplifier range with more than 200 W per channel that got the Energy Star approval when it was launched in 2011. More amplifiers with Energy Star were added with the LUCIA models in 2013.
In 2014, Lab.gruppen launched D Series for installations with audio over the network and PLM+, a successor to PLM Series.
In 2015, Lab.gruppen and the other brands of TC Group were acquired by Music Group.
In 2016, Lab.gruppen expanded the E and LUCIA product lines so that there are now 15 models with Energy Star.
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Efficiency Rating: Level of sound output measured at a prescribed distance with a standard input power. Efficiency rating standard is 1 watt (2.83V at 8 ohms) at 1 meter over a specified frequency range and is measured in decibels.
Equalization: Loosely, any type of relative frequency adjustment. Specifically, the process of changing the frequency balance of an electrical signal to alter the acoustical output.
Equalizer: A component designed to alter the frequency balance of an audio signal. Equalizers may be graphic, parametric, or a combination of both.
Fade: A gradual increase in audio, i.e. a fade-up, or a gradual decrease in audio, i.e. a fade-down.
Feedback: The transmission of current or voltage from the output of a device back to the input, where it interacts with the input signal to modify operation of the device. Feedback is positive when it’s in phase with the input and negative when it's out of phase.
FM: Frequency Modulated.
Frequency: The number of cycles (vibrations) per second. In audio, audible frequencies commonly range from 20 to 20,000 cycles per second (Hz). In video, frequency is used to define the image resolution. Low-frequency video images depict large objects or images. Higher frequencies depict smaller objects (finer details.
Frequency Response: A measure of what frequencies can be reproduced and how accurately they are reproduced. A measurement of 20 to 20,000 Hz, 3dB means those frequencies between 20 and 20,000 Hz can be reproduced no more than 3 dB above or below a reference frequency level.
Full-Range: A speaker designed to reproduce the full range (20 Hz to 20 kHz) of audio frequencies.
Gain: Increase in level or amplitude.
Gooseneck: This refers to a microphone with a flexible neck that is most frequently attached to a podium or lectern. It is designed to allow the speaker to raise or lower the microphone to a suitable height.
Graphic Equalizer: A type of equalizer with sliding controls that creates a pattern representing a graph of the frequency-response changes. Raising sliders boosts the affected frequencies lowering sliders cuts (attenuates) the affected frequencies.
HDCP: High-Bandwidth Digital Content Protection. Created by Intel, HDCP is used with HDTV signals over DVI and HDMI connections and on D-Theater D-VHS recordings to prevent unauthorized duplication of copyright material.
HDR: Hard-Drive Recorder. Device that uses a computer hard drive to store compressed digital audio and video signals.
High Pass: A filter that passes high frequencies, and attenuates low frequencies. Same as low cut.
Hz: Hertz or cycles per second. Something that repeats a cycle once each second moves at a rate of 1 Hz.
Incue/Inq/In-Point: These words all refer to the initial few seconds of audio signifying the beginning of the production.
Integrated Amplifier: A combination preamp and amplifier.
Impedance: A measure of the impediment to the flow of alternating current, measured in ohms at a given frequency. Larger numbers mean higher resistance to current flow.
KHz: Kilohertz or one thousand Hz.
Lavaliere: A small microphone that attaches to clothing, allowing the speaker to have a hands-free presentation.
Line Array: A group of speakers that have been arrayed or ” built up” in the vertical or horizontal plane, which allow for a highly consistent sound field. A Line Array is perfect for medium to large audiences.
Line-Level (Low-Level): A level of electrical signals too low to make the average speaker move sufficiently. Amplifiers receive line-level signals and amplify them to speaker level.
lockout: The final words of a segment used to signify the production’s conclusion.
Low Pass: A filter that lets low frequencies go through but doesn’t let high frequencies go through. Same as high cut.
MHz: Megahertz, or 1 million Hz.
Midbass: The middle of the bass part of the frequency range, from approximately 50 to 100 Hz (upper bass would be from 100 to 200 Hz). Also used as a term for loudspeaker drivers designed to reproduce both bass and midrange frequencies.
Midrange: The middle of the audio frequency range. Also used as a term for loudspeaker drivers designed to reproduce this range.
Mixer: This is the unit in which audio signals are directed from. A mixer provides for both mic and line input combinations while allowing you to control one or more outputs.
MLP: Meridian Lossless Packing. Encoding format that is able to completely reconstruct the original signal at the receiving end. No information is lost or discarded, regardless of how trivial it might be. Used to encode six channels of high-resolution audio on DVD-A.
Mono: Monophonic sound. One channel.
MP3: MPEG-1 Audio Layer-3. Compression scheme used to transfer audio files via the Internet and store in portable players and digital audio servers.
Natural Sound (NATS): The nonverbal audio that occurs in a non-studio setting. NATS can be used to help characterize the setting.
Noise: An unwanted portion of a signal such as hiss, hum, whine, static, or buzzing.
Nonlinear Editing: Digital audio systems that allow for clips to be extracted without affecting the master recording.
Professional used lighting equipment.| Professional second hand lighting equipment.| Professional pre owned lighting equipment.
Professional used audio equipment.| Professional second hand audio equipment.| Professional pre owned audio equipment.
Second hand audio gear. | Second hand lighting.
Pro audio equipment, second hand amplifiers, DJ, second hand sound systems, second hand Microphones, second hand Media Players.
Outdoor & Indoor LED screens for sale, LED mobile truck.
Light trussing, Gebrauchte Veranstaltungstechnik, used stage equipment Stage & Theatre lighting products.
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