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ATC Loudspeakers "Engineered To Entertain" -- ATC Technology
ATC Loudspeakers "Engineered To Entertain" -- ATC Technology
 
ATC SH 25mm soft dome tweeter ATC SH 25mm Super Dome tweeter
25mm soft dome tweeter 25mm Super Dome tweeter
ATC SB 125mm midbass driver ATC SB 150mm CLD midbass driver ATC SL 150mm Super Linear midbass driver
ATC 125mm midbass driver 150mm midbass driver 150mm SL midbass driver
ATC SM 75mm midrange driver ATC SM 75mm Super Dome midrange driver
75mm soft dome dual suspension midrange 75mm Super Dome midrange
ATC SC 180mm bass drivers ATC SL 234mm Super Linear bass drivers
180mm bass driver 234mm SL bass driver
ATC SL 314mm Super Linear bass drivers ATC SL 375mm Super Linear bass drivers
314mm SL bass driver 375mm SL bass driver
ATC SCA2 Preamplifier ATC SPA2-150 Power amplifier ATC SIA2-150 Integrated amplifier
Preamplifiers Power amplifiers Integrated amplifiers
 
 
ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 25mm soft dome tweeter
 
ATC SH 25mm soft dome tweeter
  • Features:

    • 1" complex shaped, soft-domed diaphragm
    • short coil/ long gap voicecoil system
    • 1.5 tesla (15,000 Gauss) neodymium magnet
    • black heat-treated top plate
    • precision-machined 5.5mm rigid alloy waveguide
    • dual suspension system
    • no ferrofluid

SH25-76 Tweeter
Sharing technology with the renowned ATC soft domed mid-range drive unit, the new tweeter employs a unique dual suspension system suppressing rocking modes even at high power output levels. The ATC configuration of a short edge-wound voice coil in a long, narrow magnetic gap ensures exceptionally low distortion throughout its operating band and removes the need for ferrofluids, which can dry out over time, compromising performance.

ATC SH 25mm soft dome tweeter

A complex shaped, soft-domed diaphragm extends high frequency range and offers a smooth off-axis response. The tweeter’s 15,000 gauss (1.5 tesla) neodymium magnet has a black heat-treated top plate, which dissipates heat away from the voice coil to maintain high power handling and low power compression.

ATC SH 25mm soft dome tweeter exploded view

A precision-machined 5.5mm rigid alloy waveguide provides optimum dispersion, a flat on-axis frequency response and resonance-free operation.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 25mm Super Dome tweeter
 
ATC SH 25mm Super Dome tweeter
  • Features:

    • 1" complex geometry soft-domed diaphragm
    • short coil/ long gap voicecoil system
    • 2.0 tesla (20,000 Gauss) huge neodymium magnet
    • black heat-treated top plate
    • precision-machined 5.5mm rigid alloy special waveguide designed for optimum dispersion and an extended on-axis frequency response,
    • dual suspension system
    • no ferrofluid

SH25-76S Super Dome Tweeter
The SH25-76S is ATC's premium 25mm soft dome tweeter, designed and built with the same no compromise philosophy as all other ATC drive units and to perfectly compliment the renowned SM75-150S Super Dome midrange driver.

Unlike almost any other 25mm tweeter on the market the SH25-76S is a dual suspension design which ensures pistonic motion, suppressing anharmonic rocking modes, even at high drive levels, and enables the use of narrower magnetic gaps. This, along with a short coil, long gap configuration ensures unparalleled linearity and incredibly low distortion throughout its intended operating band.

ATC SH 25mm Super Dome tweeter

The soft dome diaphragm is based on a complex geometry which maximises power transfer from the former, extending the high frequency response and giving a smooth off-axis response.

ATC SH 25mm Super Dome tweeter exploded view

The geometry of the waveguide is designed for optimum dispersion and an extended on-axis frequency response. It is made from a precision machined alloy so that the entire structure is extremely rigid and free from resonances. The motor topology and moving assembly design negate the requirement for ferro fluid.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 125mm midbass driver
 
ATC SB 125mm midbass driver
  • Features:

    • 125mm highly linear midbass driver
    • doped fabric cone
    • 45mm integral soft dome
    • 45mm flat wire voice coil
    • short coil/ long gap voicecoil system
    • die-cast aluminum  chassis, vented below spider
    • 3.5kg high-energy magnet system

ATC’s highly linear 125mm midbass driver. It features a 45mm soft dome - exceptional for its horizontal dispersion of mid-band frequencies - and a huge 3.5kg high-energy magnet system, which includes a 45mm flat wire voice coil, meticulously milled and formed by ATC.

ATC 125mm midbass

The unit has a very linear low distortion drive system comprising a 45mm diameter short coil operating in a long magnet gap that guarantees controlled coil movement, excellent heat dissipation and power handling.

The magnet system and a carefully weighted doped fabric cone assembly contribute to the wide bandwidth, impressive dynamic range and convincing bass output..

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 150mm CLD midbass driver
 
ATC SB 150mm CLD midbass driver
  • Features:

    • 150mm midbass driver
    • Constrained Layer Damping cone
    • 45mm integral soft dome
    • 45mm flat wire voice coil
    • die-cast aluminum  chassis, vented below spider
    • huge high-energy magnet system

The new SCM11 features an ATC CLD 150mm midbass driver incorporating a 45mm soft dome. Constrained Layer Damping is a driver cone technology exclusive to ATC and represents a step-change in driver-to-system performance. Advantages include reduced harmonic distortion between 300Hz and 3 kHz, an extended frequency response that eases constraints on the crossover filter slope, and improved off-axis response.

ATC 150mm CLD midbass

Constrained Layer Damping cone:

Conventional loudspeaker design recognizes that stiff driver cones generate a desirable extended on-axis frequency response. However, it comes at a price: a poor off-axis frequency response and multiple resonances that color the sound. The conventional "fix" is to damp the motion of the driver cone, but this makes the loudspeaker dramatically less efficient. Thus, every loudspeaker that has ever been designed in the genre in the history of amplified sound was virtually either acoustically compromised or inefficient.

CLD is dramatically more efficient than conventional damping because of the way it shears when the cone flexes. The shearing causes unwanted vibration energy to dissipate as frictional heat, instead of as acoustic distortion. Thus, ATC's CLD design reduces harmonic distortion between 300Hz - 3kHz, creates an extended resonance-free axial frequency response, improves the off-axis frequency response, and, if all that weren't enough, causes a huge increase in loudspeaker power response.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 150mm SL midbass driver
 
ATC SL 150mm Super Linear midbass driver
  • Features:

    • ATC's Super Linear 150mm midbass driver
    • Super Linear technology
    • doped fabric cone
    • 75mm integral soft dome
    • 75mm diameter flat wire voice coil
    • short coil/ long gap voicecoil system
    • die-cast aluminum  chassis, vented below spider
    • huge 9kg optimised high-energy magnet system

ATC's Super Linear 150mm midbass driver features an integrated 75mm soft dome – exceptional for its horizontal dispersion of mid-band frequencies – and a huge 9kg high-energy, ‘Super Linear’ magnet system, which includes a 75mm diameter flat wire, underhung voice coil, meticulously milled and formed by ATC. The magnet system and a carefully weighted doped fabric cone assembly contribute to the wide bandwidth, impressive dynamic range and convincing bass output coupled with very low distortion as a result of the unique ‘Super Linear’ motor system.

ATC Super Linear midbass driver

Super Linear technology:

This is in the form of rings of SLMM which replace the steel regions concentric with the voice coil. The effect of the rings is to reduce the third harmonic distortion by 10-15dB between 100Hz and 3kHz. This makes for distortion comparable with most electronics.

Reducing the level of distortion by such a dramatic amount has revealed another layer of information to the listener. Ambient sounds and low level effects that were previously masked are now clearly audible and provide an enhanced sense of realism. The articulation of male vocals is markedly improved and piano reproduction is given a new lease of life.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 75mm soft dome dual suspension midrange
 
ATC SM 75mm midrange driver
  • Features:

    • ATC's renowned 75mm/ 3" Soft Dome midrange
    • short coil/ long gap voicecoil system
    • massive optimised motor assembly
    • dual suspension system

SM75-150 Dome Midrange
There are few engineering developments in any field that have effected change to the extent that ATC’s Soft Dome Midrange has on the monitoring of sound and particularly of music and voice. First produced in 1976 ATC’s soft dome represents the very best of midrange loudspeaker design and performance combining a smooth response from 350Hz to 3.5KHz, exceptionally low colouration, high power handling capacity, low power compression and high output level.

This performance is achieved in ATC’s soft dome drive unit by having a very linear low distortion drive system comprising a 75mm diameter short coil operating in a long magnet gap supported on 2 suspensions to guarantee controlled coil movement, maintain concentricity with the very tight gap-coil clearances and also ensure excellent heat dissipation and power handling. The magnet gap is also in a magnetic circuit that is saturated and therefore not affected by the non-linearity due to hysteresis of the steel used in the magnetic assembly.

ATC soft dome midrange driver ATC Super Linear bass driver

The dome diaphragm, driven at its edge by the coil-former assembly, is a soft woven fabric impregnated with a viscous damping medium to attenuate unwanted resonances and ensure a smooth response with very low audible colouration. The response of the soft dome diaphragm is further improved by mounting it in a phase correction flange the profile of which is a mirror image of the dome.

All of these elements combine to produce a midrange driver of exceptional fidelity and neutrality.

ATC’s soft dome midrange is a common element in all ATC three way systems ensuring consistency between models and the best performance money can buy.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 75mm Super Dome midrange
 
ATC SM 75mm Super Dome midrange driver
  • Features:

    • ATC's highly linear 75mm “Super Dome” midrange driver
    • short coil/ long gap voicecoil system
    • huge optimised motor assembly
    • dual suspension system

SM75-150S Super Dome Midrange
ATC's highly linear 75mm soft dome dual suspension midrange driver. The use of the Super Dome mid results in excellent clarity and wide, even dispersion resulting in excellent stereo imaging.

There are few engineering developments in any field that have effected change to the extent that ATC’s Soft Dome Midrange has on the monitoring of sound and particularly of music and voice. First produced in 1976 ATC’s soft dome represents the very best of midrange loudspeaker design and performance combining a smooth response from 350Hz to 3.5KHz, exceptionally low colouration, high power handling capacity, low power compression and high output level.

ATC Super Dome midrange driver

This performance is achieved in ATC’s soft dome drive unit by having a very linear low distortion drive system comprising a 75mm diameter short coil operating in a long magnet gap supported on 2 suspensions to guarantee controlled coil movement, maintain concentricity with the very tight gap-coil clearances and also ensure excellent heat dissipation and power handling.

The magnet gap is also in a magnetic circuit that is saturated and therefore not affected by the non-linearity due to hysteresis of the steel used in the magnetic assembly. The dome diaphragm, driven at its edge by the coil-former assembly, is a soft woven fabric impregnated with a viscous damping medium to attenuate unwanted resonances and ensure a smooth response with very low audible colouration.

The response of the soft dome diaphragm is further improved by mounting it in a phase correction flange the profile of which is a mirror image of the dome. All of these elements combine to produce a midrange driver of exceptional fidelity and neutrality.

SM75-150S “Super Dome” is only available as part of an ATC  loudspeaker system.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 180mm bass driver
 
ATC SC 180mm bass drivers
  • Features:

    • ATC's highly linear 180mm bass driver
    • carbon-paper cone
    • short coil/ long gap voicecoil system
    • die-cast aluminum  chassis, vented below spider
    • massive optimised motor assembly

ATC’s highly linear 180mm midbass features a very linear low distortion drive system comprising a short coil operating in a long magnet gap that guarantees controlled coil movement and power handling.

ATC higly linear 180mm bass driver
Used in:
ATC Loudspeakers SCM 40, SCM 40A, SCM 25A Pro, SCM 45A Pro
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 234mm SL bass driver
 
ATC SL 234mm Super Linear bass drivers
  • Features:

    • ATC's Super Linear 9˝/ 234mm bass driver
    • Super Linear technology
    • short coil/ long gap voicecoil system
    • die-cast aluminum  chassis, vented below spider
    • huge optimised motor assembly

Super Linear technology:

This is in the form of rings of SLMM which replace the steel regions concentric with the voice coil. The effect of the rings is to reduce the third harmonic distortion by 10-15dB.

Reducing the level of distortion by such a dramatic amount has revealed another layer of information to the listener. Ambient sounds and low level effects that were previously masked are now clearly audible and provide an enhanced sense of realism.

Super Linear 234mm bass drivers are only available as part of ATC loudspeaker systems. ATC's.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 314mm SL bass driver
 
ATC SL 314mm Super Linear bass drivers
  • Features:

    • ATC's Super Linear 12 ˝/ 314mm bass driver
    • Super Linear technology
    • short coil/ long gap voicecoil system
    • die-cast aluminum  chassis, vented below spider
    • huge optimised motor assembly

Super Linear technology:

This is in the form of rings of SLMM which replace the steel regions concentric with the voice coil. The effect of the rings is to reduce the third harmonic distortion by 10-15dB.

Reducing the level of distortion by such a dramatic amount has revealed another layer of information to the listener. Ambient sounds and low level effects that were previously masked are now clearly audible and provide an enhanced sense of realism.

Super Linear 314mm bass drivers are only available as part of ATC loudspeaker systems. ATC's.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
ATC 375mm SL bass driver
 
ATC SL 375mm Super Linear bass drivers
  • Features:

    • ATC's Super Linear 15 ˝/ 375mm bass driver
    • Super Linear technology
    • short coil/ long gap voicecoil system
    • die-cast aluminum  chassis, vented below spider
    • huge optimised motor assembly

Super Linear technology:

This is in the form of rings of SLMM which replace the steel regions concentric with the voice coil. The effect of the rings is to reduce the third harmonic distortion by 10-15dB.

Reducing the level of distortion by such a dramatic amount has revealed another layer of information to the listener. Ambient sounds and low level effects that were previously masked are now clearly audible and provide an enhanced sense of realism.

Super Linear 375mm bass drivers are only available as part of ATC loudspeaker systems. ATC's.

Used in:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
Preamplifiers
 
ATC Preamplifier technology
  • Features:

    • Ultra-low noise fully discrete design
    • Frequency Response: DC – > 500kHz (-3dB)
    • S+N/ N Ratio > 108dB (IEC "A")
    • Aerospace grade peened stainless steel case
    • Hand built in the UK

The SCA 2 preamplifier was initially conceived to fulfil a specific need – to create a no-compromise amplifier to partner the range of ATC active loudspeaker systems. However, as development progressed it became abundantly clear that the SCA 2 preamplifier was capable of enhancing the performance of any audiophile separates system.

In fact, the outstanding ability of the SCA 2 left many who auditioned the final pre-production prototype in no doubt that they were listening to possibly the finest example of preamplifier design – ever.

The result is remarkable audiophile product which, in both laboratory and subjective listening tests, clearly redefines the state of the art.

ATC CA2 MK2 Preamplifier

A key feature of the SCA 2 is the total elimination of audio integrated circuits in the main signal path which is made possible through the introduction of no fewer than ten high performance discrete circuitry gain blocks. Furthermore, all amplifiers in the monitor chain are of similar type and built from discrete bipolar transistors and FETs. The input stage is a fully complimentary dual long tail pair arrangement which uses low-noise bipolar transistors with constant collector voltages provided by cascoded junction FETs. Output of the current mirrors is buffered by a pair of complimentary Sziklai Darlington transistors. To further minimise signal degradation, input circuitry including all sockets, selection relays and tape buffer is mounted directly onto a single PCB.

In essence, the gain block within the SCA 2 is a high output, low distortion amplifier with a very wide bandwidth which is easy to use in conventional feedback configuration because it has only one stage of gain (in other words, there is only one possible source of roll-off and phase shift at high frequency).

The result is remarkable audiophile product which, in both laboratory and subjective listening tests, clearly redefines the state of the art.

ATC CDA2 Preamplifier

Clean stable power supplies result from local active decoupling of supply rails adjacent to each gain stage, with each channel separated to minimise crosstalk of supply artifacts.

Auditioning reveals an open, neutral, transparency the amplifier creating a solid soundstage which is both wide and deep. Voices are reproduced with uncanny realism being portrayed with natural warmth and articulation. Bass takes on a rich, superbly controlled solidity. Strings are reproduced with a fine degree of detail and texture, while brass is conveyed with attack and clarity. Percussion is handled with great speed and definition. As you’d expect from a design as highly specified as the SCA 2, dynamic range is outstanding.

The distinctive case of the SCA 2 is constructed from aerospace grade peened stainless steel. The 440mm (17%) wide front panel is edged with bead-blasted machined aluminium the fascia being finished in polished acrylic. Optional alternative colours and surface treatments are available to special order.

ATC preamplifiers:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
Power amplifiers
 
ATC P1 Power amplifier
  • Features:

    • Fully discrete design
    • Frequency Response > 400 kHz (-3dB)
    • S+N/ N Ratio > 110dB (IEC "A")
    • Damping Factor > 400
    • ATC “Grounded Source Topology”
    • Soft limiting driver protection
    • Hand built in the UK

As designers of the worlds most sophisticated loudspeaker drive units ATC are only too aware of the requirements for a power amplifier to properly drive a real loudspeaker load. The grounded source amplifier, with its novel swinging supply, best meets those requirements.

We are using a grounded source output stage, driven by a buffer based on a discrete gain block which enables the amplifier to deliver such astonishing performance figures. Used in this way to drive the FET output stage, distortion components are more than 95db down under any conditions, ensuring totally clean and transparent sound with the effortless dynamics for which ATC is justly famous.

ATC P1 Power amplifier

ATC amplifiers are thermally protected and include a super fast acting FET limiter to protect the drivers in the event of an unexpected peak. Because these limiters are designed specifically for driver protection, they do not leave a big audio footprint and are far less intrusive in operation than conventional limiter designs.

The high electrical damping from the power amplifier keeps the system tightly controlled, providing well defined bass and midrange detail.

SPA2-150 Power amplifier

Input to the amplifier utilises a similar discrete gain block and offers both balanced and unbalanced capability for universal system matching. This input buffer, which completely eliminates integrated circuits, achieves the same levels of transparency as the famous ATC SCA2 pre amplifier.

ATC SPA2-150 Power amplifier

Input to the amplifier utilises a similar discrete gain block and offers both balanced and unbalanced capability for universal system matching. This input buffer, which completely eliminates integrated circuits, achieves the same levels of transparency as the famous ATC SCA2 pre amplifier.

The output stage of the SPA2-150 is continuously monitored by microcomputer and a carefully programmed limiter prevents amplifier clip and protects loudspeaker drive units.

Front panel indication of limiter operation is provided separately for each channel. Additionally the amplifier is monitored for over-temperature and DC offset.

ATC P1 Power amplifier

Construction is Twin-mono, with separate high capacity mains transformers for each channel. The FET output stage is very fast and layouts follow best RF practice with direct signal paths and direct low impedance power supplies.

Remote control of the SPA2-150 is possible using the SCA R remote controller, or any other standard RC5 device. High quality connectors are used throughout including massive WBT terminals.

Styling is complementary to the SCA2 with high quality peened stainless steel covers atop naked aluminium machined corners. A dark grey textured finish is also available to special order.

ATC power amplifiers:
ATC Loudspeakers
 
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ATC Loudspeakers "Acoustic Engineers" -- ATC Products
 
Integrated amplifiers
 
ATC SIA2-150 Integrated amplifier
  • Features:

    • Fully discrete design
    • Frequency Response 2 Hz – > 400kHz (-3dB)
    • S+N/ N Ratio > 110dB (IEC "A")
    • Damping Factor > 400
    • ATC “Grounded Source Topology”
    • Soft limiting driver protection
    • 5 RCA inputs
    • Record, sub and pre outputs
    • Headphone jack
    • Remote control
    • Hand built in the UK

The amplifier driving the loudspeaker must deliver sufficient power over the full dynamic range of the program material to sustain the required sound level.

Front panel indication of limiter operation is provided separately for each channel. Additionally the amplifier is monitored for over-temperature and DC offset.

ATC SIA2-150 Integrated amplifier

All of ATC’s electronics are built in house to their exact requirements and share a common grounded source MOSFET power stage design. The ATC-built Class AB amplifier operates in Class A up to approximately 66% of rated power, with Class B operation taking over above that point to provide ample headroom.

The high electrical damping from the SIA2-150 integrated amplifier keeps the system tightly controlled, providing well defined bass and midrange detail.

ATC integrated amplifiers:
ATC Loudspeakers
 
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Film, Post & Broadcast

powered by ATC Loudspeakers
  • BBC UK
  • Carlton Television
  • London Post
  • Swedish Radio
  • Broadcast Station Sapporo
  • London Studios (ITV)
  • Polish Broadcast
  • CBC Canada
  • Hokkaido Television Sapporo
  • Asahi Television Tokyo
  • SBS Television Australia
  • Esprit Film & Television, Gloucestershire, England
  • Ishikawa Television Japan
  • Tokai Television Nagoya
  • Fuji Television Tokyo
  • WGBH Boston
  • Off the Fence, Bristol, England
  • Studio KGB, Paris, France
 
 
   

Engineers & Producers

powered by ATC Loudspeakers
 
 
   

Download

  ATC Loudspeakers
 
Why is ATC different?
Why is ATC different? (PDF)
 
Loudspeaker Technology
Loudspeaker Technology Limited (PDF)
 
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