Genelec 1236A M

SKU: Genelec 1236A M-Single
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Genelec 1236A M

2 x 18" LF/2 x 1000W, 2 x 5" MF/800W, 1" HF/400W. Remote RAM-XL Amplifier

A masterpiece of design and application, the 1236A is the flagship of the Genelec range. Equipped with a wealth of state-of-the-art technology, its intelligence is seamlessly integrated into the finest example of acoustic engineering yet produced over more than 35 years of Genelec history.

Extremely powerful with a peak SPL of 130dB, the tri-amplified system incorporates an individually calibrated RAM-XL, 3U high rack-mountable Remote Amplifier Module, with temperature controlled forced-air cooling for super silent operation. Inside the sturdy, flush-mountable enclosure are dual 18 inch woofers, a midrange section comprising dual 5 inch drivers, and a 2 inch compression tweeter, while the very large Directivity Control Waveguide (DCW™) ensures neutral sound reproduction with absolute precision in both on- and off-axis imaging. New levels of control then become available thanks to the incorporation of Smart Active Monitoring (SAM™). Genelec Loudspeaker Manager (GLM™) software allows for the fine adjustment of up to 30 individual Smart monitors and Smart subwoofers to facilitate any multi-channel audio set-up, while AutoCal™ compensates for detrimental room influences and perfectly calibrates your set-up for your listening environment.

The highest reference available, the Genelec 1236A is where power and finesse combine for a truly extraordinary result.

Key Technologies

Smart Active Monitor (SAM™) Systems

The last decade has experienced a rapid increase in global media content creation, resulting in significant changes in the way network facilities deal with increased workload. Now, more than ever, a growing number of audio productions are done in tighter, more confined working environments. This increases acoustic problems and lowers the reliability of monitoring. At the same time, a professional audio engineer needs to have high confidence in a reliable and precise monitoring system that reproduces sound neutrally and without distortion.

Built upon the solid electro-acoustic foundations of the 1200, 8000 and 7000 Series products, Genelec advanced SAM Systems are today’s most advanced and flexible monitoring solutions. They are an indispensable tool for audio professionals, as they are capable to automatically adapt to the acoustic environments and correct for levels, delays and room anomalies. SAM Systems can be controlled via Genelec proprietary Loudspeaker Manager (GLM™) network and software, enabling you to build a highly flexible and reliable monitoring system.

The GLM 3 software is a highly intuitive and powerful monitor control networking system that manages connectivity to all SAM studio monitors and subwoofers on the network – up to 30. The GLM 3 software features adjustment of levels, distance delays and flexible room response compensation equalization with the state-of-the-art and robust AutoCal™ automated calibration system. All parameters and settings are stored in system setup files or saved in each individual monitor or subwoofer if the GLM network needs to be disconnected.

Also, all acoustical features of SAM Systems can be optimised for different working styles or client demands. Additionally, even if the monitors or the production projects move between rooms, you can expect SAM technology to achieve the highest consistency in monitoring, providing a neutral sound stage imaging with low distortion.

Genelec SAM Systems offers a comprehensive, solution-oriented, intelligently networked product range supporting analogue and digital signals in virtually any working environment.

Room Response Compensation

The interaction between room acoustic and loudspeaker radiation is complex. Each room changes somewhat the monitor’s response in a unique way, e.g. reflective vs. damped rooms, or placement against a wall vs. on a stand away from the walls.

All Genelec loudspeaker systems feature room response adjustments to compensate for the room influences and retrieve a flat frequency response at the listening position.

Analogue Systems

Genelec analogue loudspeaker systems provide versatile Room Response Controls. They include (depending on models):

  • Bass Roll-Off and Bass Tilt
  • Treble Tilt and Treble Roll-Off
  • Bass Level
  • Midrange Level
  • Treble Level
  • Desktop Control

At low frequencies two main controls are provided. The Bass Tilt control, which acts as a shelving filter together with the Bass Roll-off control allowing you to optimize the low and very low frequency response of the system in different installations. Bass, midrange and treble level controls are provided in large systems. These controls allow to optimize the relative balance between the various pass bands.

The operating manual and datasheet of each loudspeaker contains a list of preferred room response control settings for different installations. These have been specified out of long practical experience and measurements of various kind of typical acoustic environments.

Smart Active Monitor (SAM™) Systems

Genelec SAM Systems offer a comprehensive, solution-oriented, intelligently networked product range which all feature Genelec Loudspeaker Manager (GLM™) software and its automatic calibration system called AutoCal™.

Genelec AutoCal provides the industry’s first integrated process for complete automated measurement, analysis, and adjustment of every monitor on the GLM control network. The system measures the response in the listening area and applies relevant compensation in the low and low-mid frequencies to minimise the detrimental room acoustic anomalies as well as the differences between various listening positions. AutoCal also aligns relative levels, time-of-flight, as well as adjusts correct crossover phase (called AutoPhase) for all subwoofers on the network.

The Acoustic Response Editor provides accurate graphical display of the measured response, filter compensation and the resulting system response for each monitor, with full manual control of acoustic settings

Protection Circuitry

When working in critical audio production environments it is essential that monitoring systems remain reliable and functional at all times. One of the main reasons behind Genelec’s excellent success in broadcasting environments is the reliability of our products and a key element behind the reliability is the internal protection circuitry found in all products since 1978.

The protection circuitry prevents driver failures by detecting signal levels, and in case of sudden peaks or constantly too high levels, taking the signal level down automatically. Of course this feature does not affect the sound quality in any way when working within the specifications of the loudspeaker, but only prevents inadequate input signals from breaking the loudspeaker.

Protection circuitry features and benefits:

  • Reduces the output level when required, (e.g. when driver voice coil temperature reaches the safe limit) which highly improves the system reliability
  • Appropriate protection circuitry design in every loudspeaker and subwoofer enables to maximise system output sound level.

Intelligent Signal Sensing (ISS™) Technology

Introduced early 2013, Genelec’s Intelligent Signal-Sensing technology has been developed to meet with both European Union ErP Directives and the company’s own wider sustainability commitments.

The Intelligent Signal Sensing, ISS™ circuitry tracks the signal input of the loudspeaker and detects if it is in use. If the ISS circuit does not find any audio on the input for a period of time, it sets the loudspeaker to a low-power sleep state and the loudspeaker will consume less than 0.5 watts. When an input signal is detected, the loudspeaker immediately turns itself on. Basically, the loudspeaker system will start saving power as soon as work is interrupted.

Additionally an ‘ISS Disable’ switch is located on each product’s back plate next to the other room response controls. First, when the mains power switch of the loudspeaker is set to “ON”, the ISS™ auto-start function (low-power sleep state on/off) of the loudspeaker is active.

If this function is not desired, the ISS™ function can be disabled by setting the “ISS Disable” switch on the back panel to “ON” position. In this mode, the monitor is only powered on and off using the mains power switch.

Note that the mains power switch will always turn the monitor off completely.

Directivity Control Waveguide (DCW™) Technology

A revolutionary approach was taken by Genelec in 1983 with the development of its Directivity Control Waveguide (DCW™) used at the time in an egg-shaped enclosure. The Genelec DCW technology developed and refined over more than 30 years greatly improves the performance of direct radiating multi-way monitors.

The DCW technology shapes the emitted wavefront in a controlled way, allowing predictable tailoring of the directivity (dispersion) pattern. To make the directivity uniform and smooth, the goal is to limit the radiation angle so that the stray radiation is reduced. It results in excellent flatness of the overall frequency response as well as uniform power response.  This advanced DCW technology minimizes early reflections and provides a wide and controlled listening area achieving accurate sound reproduction on- and off-axis.

Minimized early reflections and controlled, constant directivity have another important advantage: the frequency balance of the room reverberation field is essentially the same as the direct field from the monitors. As a consequence, the monitoring system's performance is less dependent on room acoustic characteristics.

Sound image width and depth, critical components in any listening environment, are important not only for on-axis listening, but also off-axis. This accommodates not only the engineer doing his or her job, but also others in the listening field, as is so often the case in large control rooms.

DCW™ Technology key benefits:

  • Flat on- and off-axis response for wider usable listening area
  • Increased direct-to-reflected sound ratio for reduced control room coloration
  • Improved stereo and sound stage imaging
  • Increased drive unit sensitivity up to 6 dB
  • Increased system maximum sound pressure level capacity
  • Decreased drive unit distortion
  • Reduced cabinet edge diffraction
  • Reduced complete system distortion

Active Crossovers

Audio electronic crossovers allow to split the audio signal into separate frequency bands that can be separately routed to individual power amplifiers which then are connected to specific transducers optimized for a particular frequency band.

Active crossovers come in both digital and analogue varieties. Genelec digital active crossovers include additional signal processing, such as driver protection, delay, and equalization.

Genelec analogue active crossover filters contain electronic components that are operated at low signal levels suitable for power amplifier inputs. This is in contrast to passive crossovers that operate at the high signal levels of the power amplifier's outputs, having to handle high currents and in some cases high voltages.

In a typical 2-way system the active crossover needs two power amplifiers — one for the woofer and one for the tweeter.

The active crossover design offers multiple benefits:

  • The frequency response becomes independent of any dynamic changes in the driver's electrical characteristics or the drive level.
  • There is an increased flexibility and precision to adjust and fine tune each output frequency response for the specific drivers used.
  • Each driver has its own signal processing and power amplifier. This isolates each driver from the drive signals handled by the other drivers, reducing inter-modulation distortion and overdriving problems.
  • The ability to compensate for sensitivity variations between drivers.
  • The possibility to compensate for the frequency and phase response anomalies associated with a driver’s characteristics within the intended pass-band.

The flat frequency response of a high-quality active loudspeaker is a result of the combined effect of the crossover filter response, power amplifier responses and driver responses in a loudspeaker enclosure.

Using the active approach enables frequency response adjustments and optimization of the full loudspeaker system, placed in various room environments, without expensive external equalizers. The end result is a simpler, more reliable, efficient, consistent and precise active loudspeaker system.

Optimized Amplifiers

Audio electronic crossovers allow to split the audio signal into separate frequency bands that can be separately routed to individual power amplifiers which then are connected to specific transducers optimized for a particular frequency band.

In a typical 2-way loudspeaker system, the active crossover needs two power amplifiers — one for the woofer and one for the tweeter. The power amplifiers are connected directly to the drivers of an active loudspeaker, resulting in the power amplifier’s load becoming much simpler and well known. Each driver-specific power amplifier has only a limited frequency range to amplify (the power amplifier is placed after the active crossover) and this adds to the ease of design.

The active design principle offers multiple benefits:

  • The power amplifiers are directly connected to the speaker drivers, maximizing the control exerted by the power amplifier’s damping on the driver’s voice coil, reducing the consequences of dynamic changes in the driver electrical characteristics. This may improve the transient response of the system.
  • There is a reduction in the power amplifier output requirement. With no energy lost in the passive crossover filter components, the amplifier power output requirements are reduced considerably (by up to 1/2 in some cases) without any reduction in the acoustic power output of the loudspeaker system. This can reduce costs and increase audio quality and system reliability.
  • No loss between amplifier and driver units results in maximum acoustic efficiency
  • Active technology can achieve superior sound output vs. size vs. low frequency cut-off performance
  • All loudspeakers are delivered as a factory aligned system (amplifiers, crossover electronics and enclosure-driver systems)


      • Lower cut-off frequency, –6 dB: ≤ 17.5 Hz
      • Upper cut-off frequency, –6 dB: 26 kHz
      • Accuracy of frequency response, ± 2 dB: 21 Hz – 20 kHz
      • Maximum short term sine wave acoustic output,100 Hz to 3 kHz at 1 m: 130 dB SPL
      • Maximum long term RMS acoustic output at 1 m: 125 dB SPL
      • Maximum peak acoustic output per pair, at 2 m: 136 dB
      • Self generated noise level, at 1 m (A-weighted): ≤ 5 dB
      • Harmonic distortion at 90 dB SPL at 1 m: < 0.5 %
      • Bass driver (magnetically shielded): 2 x 18 in cone
      • Midrange driver (magnetically shielded): 2 x 5 in cone
      • Treble driver (magnetically shielded): Compression tweeter 2" into 1 " throat
      • Weight (monitor encloser): 401 lb (182 kg)
      • Weight (amplifier): 25 lb (11.2 kg)
      • Dimensions (monitor encloser): 37 3/4 in, 46 1/2 in, 25 5/8 in
      • Dimensions (amplifier): 19 in, 16 3/4 in, 11 1/4 in
      • Bass amplifier short term output power: 2 x 1000 W
      • Midrange amplifier short term output power: 2 x 400 W
      • Treble amplifier short term output power: 250 W
      • Amplifier system THD at nominal output: <0.003 %
      • System Signal to Noise ratio, A-weighted: > 115 dB
      • Mains voltage: 100-120, 220-240 VAC 50/60 Hz
      • Power consumption- Standby, idle, full output, full output (peak): 6 W, 40 W, 1000 W, 2400 W
      • Analog input: XLR, balanced 10 kOhm
      • Maximum analog input signal: +25.0 dBu
      • Analog input sensitivity (100 dB SPL at 1 m): -6 dBu
      • Analog input gain selection: 0, +6, +12, +18 dB
      • Digital input: XLR female 110 Ohm, AES/EBU Single Wire
      • Digital output/thru-put: XLR male 110 Ohm, AES/EBU Single Wire
      • Digital input word length: 16 - 24 bits
      • Digital input sample rate: 32 - 192 kHz
      • Digital input sensitivity (100 dB SPL at 1 m ): -30 dBFS
      • Digital input gain selection: 0, +6, +12, +18 dB
      • Control network type: Proprietary GLM network
      • Control network connection: 2 RJ45, CAT5 cables
      • Crossover frequency: 420 Hz, 3.2 kHz
      • GLM notch filters: 4 LF and 2 HF
      • GLM shelving filters: 2 LF and 2 HF
      • System room response calibration: Genelec GLM AutoCal


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