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Pro Audio Design (PAD) has a very nice pre-owned Genelec 1039A LCR system with 7071 dual 12" subwoofers, available at a fraction of the price of a comparable new system.

The Genelec 1039A is a powerful, 3-way active reference main monitor system for soffit or in-wall-mounted installation with dual 15" drivers, 5" proprietary midrange driver, and 1" metal dome tweeter, featuring Genelec’s Directivity Control Waveguide.

Manufactured between 1995 and 2015 (your PAD Professional has the complete details) the TEC Award-winning Genelec 1039A was designed for flush, wall-mounted use in large control rooms. The 1039A is an 11.3 ft3 (320 liters) enclosure that houses two 15" LF drivers, and a 5" proprietary midrange driver plus 1" metal dome tweeter mounted in Genelec’s Directivity Control Waveguide (DCW™). The waveguide is the secret behind the 1039A’s excellent on- and off-axis response, which provides a stable and neutral sound image regardless of listener position or acoustic environment—great for clients scattered around a large control room when it’s time to crank up the party speakers. Power and control for the 1039A includes 3 amplifiers, low-level active crossover, precise room response controls, and protection circuitry all combined in a 7U 19" equipment rack. Designed for large control rooms the 1039A is ideal for music recording studios, large film and video post-production facilities and mastering suites, where broad bandwidth, high SPL, and extended low-frequency response are the order of the day.

Genelec 1039A key features and tech:

  • Large, optimized Directivity Control Waveguide (DCW™) allows for excellent on- and off-axis response
  • Protection circuitry prevents speaker damage and distortion
  • Bass, midrange, and treble low-distortion amplifiers output 126dB SPL at 2m
  • Dual long-throw LF drivers and field replaceable midrange driver and tweeter
  • Flush mounting prevents unwanted reflections
  • Versatile crossover controls for precise matching to different environments

Genelec 1039A—What’s In The Box

Directivity Control Waveguide Technology

The revolutionary Directivity Control Waveguide improves the performance of direct-radiating, multi-way loudspeakers in normal listening conditions. The concept is to match the different drive units precisely, both in terms of frequency response and directivity, resulting in a more smooth and virtually uncolored off-axis response. Due to improved control of directivity, especially in the midrange frequencies, more direct sound and less early boundary reflections occur at the listening position. This results in more accurate stereo imaging and makes the system less sensitive to differing control room acoustics than any conventional direct radiator design. DCW Technology improves drive unit sensitivity from +2dB to +6dB, thus increasing the system’s maximum sound pressure level.

The consistent off-axis frequency response of the waveguide enables engineers to move in and out of the sweet spot without losing perspective while working. It also helps clients hear an accurate mix regardless of their listening position in a large control room. In addition, simply rotating the waveguide allows vertical mounting.  

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 soundstage imaging
  • Increased drive unit sensitivity up to 6dB
  • Increased system maximum sound pressure level capacity
  • Decreased drive unit distortion
  • Reduced cabinet edge diffraction
  • Reduced complete system distortion

Protection circuitry

The 1039A amplifier unit contains electronic circuitry which serves to protect the drivers from damage by overload and distortion. These circuits monitor each amplifier channel and automatically reduce the signal level to a driver if overload conditions occur, also reducing the signal level to all drivers in the loudspeaker by the same amount. This preserves the frequency balance of the loudspeaker. An LED on the loudspeaker enclosure indicates the protection circuitry’s status.


The bass, midrange and treble amplifiers each produce 2 x 400W, 350W, and 120W respectively of short-term power with very low THD and IM distortion (total harmonic distortion and intermodulation distortion). The electronics have been carefully designed to ensure the highest possible sound quality. Along with driver overload protection, the system incorporates special circuitry for the amplifier’s thermal protection, The fast, low distortion amplifiers are capable of driving a stereo system to peak output levels in excess of 126dB SPL at 2 m with program signals.


The 1039A’s low frequencies are handled by two long-throw 15" (385 mm) bass drivers loaded with a vented 11.3 ft3 (320 liters) box. Bass extension is down to 29Hz (-3dB) and 25Hz at the -6dB point. Midrange frequencies are reproduced by a proprietary 5" (130 mm) high-sensitivity, direct-radiating cone driver loaded in the DCW (waveguide). The high-frequency driver, also loaded in the waveguide, is a 1" (25 mm) metal dome with an upper -3dB point at 22kHz. The midrange and high-frequency drivers have field replaceable diaphragms.

Flush mounting

Flush-mounting the 1039A enclosure into a wall eliminates unwanted secondary sound reflections from the cabinet’s edges and nearly idealizing the radiation space to half space* by eliminating reflections from the wall behind the loudspeaker. The advantages of flush mounting are a linear low-frequency response, increased speaker output, improved transient response and imaging, plus minimization of diffraction effects. Moreover, the 1039A has versatile crossover controls to compensate and adjust response variations due to different loudspeaker positioning and room loading.

PAD Pro tech note: A loudspeaker in the middle of an open space is said to be in free-field, radiating sound in front of and behind the loudspeaker. “Half-space” is when it’s placed next to a large solid surface such as a wall. The surface (acoustical boundary) limits the sound radiation to half of what it is in the free field. This has the effect of boosting the frequencies that are radiated omnidirectionally, i.e. the low frequencies. The amount of boost depends on the solidity of the surface (theoretically 6dB, in practice about 4dB), and the frequency range depends on the size of the loudspeaker. This can be corrected with a suitably shaped filter. In practice, half-space is experienced when a loudspeaker is placed next to or flush-mounted into a wall.

Crossover filter

The 1039A’s active crossover network consists of three parallel band-pass filters with crossover frequencies at 400Hz and 3.2kHz, 24dB/octave slopes, and a common balanced input stage. Acoustically complementary, all filters are aligned for equal phase and group delay characteristics. In order to obtain uniform frequency balance under different acoustic conditions, special calibrated controls are featured in the crossover. The bass, midrange and treble level controls operate in 1dB steps. Additionally, the Bass Tilt and Roll-off controls both have four 2dB steps to allow refined low-frequency response tailoring. A high-pass filter is included in the low-frequency channel to protect the bass drivers from subsonic interference signals. Variable input sensitivity allows for accurate level matching to the mixing console.

Genelec 7071A Studio Subwoofer

The Genelec 7071A was in production between 2002 and 2016.

The Genelec 7071A comprises two 12" bass drivers to provide double the surface area to handle the long wavelengths of low frequencies. It features Genelec’s patented Laminar Spiral Enclosure (LSE™), high sound pressure capability, and very neutral reproduction characteristics. With bass extension down to 19Hz, the 7071A enables you to hear precisely what’s occurring in the subsonic range of music production or feature film effects, which in turn allows you to make intelligent EQ and filtering decisions, saving headroom while maintaining critical bass information. And of course, it doesn’t hurt to be able to impress hip-hop and R&B artists with mo’ bass. The 7071A incorporates all the amplifier and crossover electronics needed for bass management and reproduction in modern 6.1 or 5.1 channel surround sound or traditional stereo systems, making it an ideal solution for recording studios, mastering suites, post-production houses, and broadcast facilities.

Genelec 7071A key features:

  • Dual 12" LF drivers
  • Subwoofer bypass
  • Laminar Spiral Enclosure (LSE) technology
  • Bass management system
  • Optimized amplifiers
  • Protection circuitry
  • Active crossovers
  • Room response controls

Genelec 7071A—What's In The Box?

The 7071A features an amplifier unit integrated into the cabinet, which contains active crossover filters, driver overload protection circuitry, power amplifier, and complete bass management system. The built-in unit has six signal inputs and outputs via balanced XLR, a summed XLR signal output, an 85/120 Hz selectable low-pass LFE XLR input and a 0/+10dB LFE channel sensitivity switch.

Subwoofer bypass control

A bypass is included in the subwoofer circuits so that the effect of the subwoofer on the whole monitor system can be assessed. With bypass on, the high-pass filters for the main monitors are overridden and the system behaves as if the subwoofer wasn’t connected. The bypass function has no effect on the LFE input. Two different bypass remote controllers are available as optional equipment: 1092-400 switch that can be connected to a 1/4" jack connector on the connector panel and 7000-416 that connects to the "Remote" RJ11 connector. The 7000-416 option also includes remote control of the "LFE +10dB" function and a link for the 7000-415 remote LED option.

Laminar Spiral Enclosure (LSE)

An essential property of a subwoofer operating at high sound pressure levels is its capacity to move high volumes of air without distortion, which is a function of air turbulence inside the bass reflex port. This effect presents challenges to the woofer and reflex port designs. Genelec’s patented Laminar Spiral Enclosure (LSE) provided the solution.

By way of a little background, large air currents, such as those found in bass reflex ports, have a great deal of kinetic energy, which causes the flow to be irregular and turbulent as cross-streams perpendicular to the direction of air flow is formed. A laminar air flow is a streamline flow in which air travels smoothly in parallel layers or paths, with no interference or disruption across layers. 

The Laminar Spiral Enclosure (LSE) bass reflex cabinet provides excellent laminar flow characteristics with minimal turbulence noise and enables an optimal packing of a very long reflex tube into a small space.

The 7071’s enclosure is made from a spiral-shaped strip of steel. Its purpose is to provide mechanical stability for a large amount of pressure generated inside the subwoofer. The spiral also forms the bass reflex port, enabling linear airflow even at the highest SPL output. The fact that one is part of the other means that air flow in and out of the enclosure's interior through the port is totally unrestricted. This flow-optimized construction provides extended low-frequency capacity and low distortion resulting in precise bass articulation, with measured second and third harmonic distortion levels typically better than 30dB below the fundamental. This results in an extraordinarily accurate and responsive low-frequency system.

Bass management system

Bass management, from a corporate perspective, is the man’s way of keeping the low frequencies down. Seriously, it’s quite simply a means of directing the bass content of main and low-frequency effect (LFE) channels to the speakers that are best capable of handling them. A Bass Management system uses either analog electronic circuitry or software-based filtering to take low-frequency information from the main channels and route it to a subwoofer feed. Bass management’s basic and main goal is to ensure that the entire audio bandwidth of all channels can be accurately monitored.

The bass management unit in the 7071 subwoofer splits the input into low- and high-frequency components at 85Hz. Frequencies below 85Hz are reproduced by the subwoofer. Frequencies above 85Hz are directed via the subwoofer's output connectors to the main monitors. The 7071A has an LFE bandwidth switch that can select between 19Hz-85Hz or 19Hz-120Hz.

Bass management benefits are:

  • The subwoofer extends the system frequency response down the lower limit of the audible range
  • Monitor can produce a higher maximum sound level when not reproducing low frequencies
  • Optimized low-frequency reproduction by selecting adequate subwoofer location; monitors can also be placed more freely
  • Subwoofer’s output are aligned in level and phase with monitors allowing flat and accurate reproduction down to 19 Hz and across the crossover point
  • LFE channel output level (0 or +10 dB re. main channels) can be selected for accurate reproduction depending on the source type
  • The ability to bypass the subwoofer allows you to evaluate the audible impact of the subwoofer

Optimized amplifier

A custom, Genelec-designed and manufactured Class D power amplifier connected directly to the driver produces 500W output power with very low total harmonic distortion (THD) and intermodulation distortion (IM). Driver-overload, thermal overload, and short-circuit protections are built into the amplifier circuitry. The power supply accepts mains voltages from 100 to 240 VAC.

Protection circuitry

In the studio, downtime is not an option, particularly when equipment fails and must be shipped out for repairs. Whether you’re working in a professional production environment or even as a hobbyist, it’s essential that monitoring systems remain reliable and functional at all times. Genelec’s reputation for bullet-proof reliability is a product of the internal protection circuitry found in all Genelec monitors.

The protection circuitry prevents driver failure by detecting signal levels and responding accordingly. In the case of sudden peaks or levels that are too high for long periods, the protection circuitry reduces signal level automatically. This feature does not affect the sound quality in any way when working within the specifications of the loudspeaker, but only prevents inappropriate 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 system reliability
  • Appropriate protection circuitry design for each loudspeaker and subwoofer maximizes system output level

Active crossovers

In a typical 2-way loudspeaker system, the active crossover needs two power amplifiers; one for the woofer and one for the tweeter. Electronic crossovers split the audio signal into separate frequency bands that can be separately routed to individual power amplifiers optimized for the frequency band of their respective transducers.

The power amplifiers are connected directly to the drivers of an active loudspeaker, resulting in the power amplifier’s load becoming much simpler. Each driver-specific power amplifier has only a limited frequency range to amplify (the power amplifier is placed after the active crossover), which 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)

Room response controls

While the Directivity Control Waveguide reduces room interaction, it doesn’t eliminate it entirely. The interaction between room acoustics and loudspeaker radiation is complex. Each room changes 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.

7071A rear-panel room-compensation controls include: +12 to –6dBu input sensitivity; bypass; 85/120Hz LFE bandwidth; 0/+10dB LFE sensitivity; Redirect (redirects LFE channel signal above 85 Hz to center channel); Sum In (changes subwoofer to Sum in mode); 85Hz test tone for phase adjustment; bass roll-off (0/-2dB/-4dB/-6dB @ 20Hz); and phase switch (0/90/180/270°).

With Pro Audio Design’s pre-owned program, which includes assessment, service, and a 90-day warranty, you can be assured the system will work like new at a fraction of the price of a comparable current system. For more information integrating a Genelec 1039A/7071A LCR system into your studio, contact your PAD Professional today.



  • Lower cut-off frequency, -3dB: ≤ 29Hz
  • Upper cut-off frequency, -3 dB: ≥ 20kHz
  • Free field frequency response: 31Hz – 20kHz (±2.5dB)
  • Maximum short term sine wave acoustic output on axis in half space, averaged from 100 Hz to 3 kHz: @ 1 m >126 dB SPL
  • Maximum long term RMS acoustic output in same conditions with IEC-weighted noise (limited by driver unit protection circuit): @ 1m >120 dB SPL
  • Maximum peak acoustic output per pair @ 2 m from the engineer with music material: ≥ 130dB
  • Self generated noise level in free field @ 2 m on axis: ≤ 15dBA
  • Harmonic distortion at 100dB SPL: 50-200Hz <1%; 200-10kHz <0.5%


  • Bass: 2x 15" (385mm)
  • Mid: 5" (130 mm)
  • Treble: 1" (25 mm) metal dome

Amplifier Section

  • Bass amp @ 8 ohm: Short term 2 x 400W
  • Mid amp @ 8 ohm: Short-term 350W
  • Treble amp @ 8 ohm: Short-term 120W

(Long-term output power is limited by driver unit protection circuitry)

  • Slew rate: 80V/μs
  • THD: ≤0.05%
  • SMPTE-IM: ≤0.05%
  • CCIF-IM: ≤0.05%
  • DIM 100: ≤0.05%
  • Signal to noise full output (bass, mid, treble): ≥100dB
  • Mains voltage: 100/200V or 115/230V
  • Voltage operating range @ 230V: 207 - 244 V (-10/+6 %)
  • Voltage operating range @ 115V: 104 - 122 V (-10/+6 %)
  • Power consumption: 70W idle; 1000W full output

Crossover Section:

  • Input connector: XLR female balanced
  • Input impedance: 10k ohm balanced
  • Input level for 100dB SPL output @ 1 m: Variable from +6 to -6dBu
  • Input level for maximum short term output of 126 dB SPL @ 1 m: Variable from +32 to + 20dBu
  • Subsonic filter below 27Hz: 18dB/octave
  • Subsonic filter below 22kHz: 12dB/octave
  • Bass/mid crossover frequency: 400Hz
  • Mid/treble crossover frequency: 3.2kHz
  • Crossover acoustical slopes: >24dB/octave

Level control operating range in 1dB steps:

  • Bass: 0 to -6dB & Mute
  • Mid: 0 to -6dB & Mute
  • Treble: 0 to -6dB & Mute
  • Bass roll-off control (2dB steps): 0 to-8dB @ 29Hz
  • Bass tilt control (2dB steps): ): 0 to-8dB @ 50Hz

The ‘CAL’ position corresponds to a maximally at free-field response with all tone controls set to “off” and input sensitivity control to maximum

Speaker dimensions (Horizontal mounting)

  • Height: 32-1/4" (820 mm)
  • Width: 39-3/8" (1050 mm)
  • Depth: 21-5/8" (550 mm)

Amplifier dimensions:

  • Height: 12-3/16" (310 mm)
  • Width: 19" (483 mm)
  • Depth: 9-13/16" (250 mm)


  • Speaker: 253 lb. (115kg)
  • Amplifier 49 lb. (22kg)

Genelec 7071A subwoofer specifications:

  • Max SPL: 118dB
  • Frequency response (free field): 19Hz – 85Hz ±3dB; LFE 85/120Hz
  • Frequency range: 19Hz-85Hz (-6dB)
  • Output power (short term): 500W
  • Inputs: 6.1 XLR
  • Outputs: 6x XLR
  • Link out: 1x XLR
  • Dimensions (HWD): 29-3/4" x 31-5/8" x 19-5/16" (755 x 803 x 490 mm)
  • Weight: 178 lb. (81 kg)




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