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atc sca2 pre-amp high definition pre-amp for sale in the usa at
  • The SCA2 offers eight audio inputs - all of which are electronically buffered and selected by precision gas-filled gold-plated relays: two are balanced (CD Bal and Aux 1 - each individually trimmed for optimum CMRR).
  • CD, TA/AV, Tuner, Aux 2, Tape 1 and Tape 2 are unbalanced. Buffers for both tape circuits use a monolithic operational amplifier as used extensively in recording studio equipment and provides monitor and 'howlround' protection.
  • Clean stable power supplies result from local active decoupling of supply rails adjacent to each gain stage, with each channel separated to minimize crosstalk of supply artifacts.
  • The distinctive case of the SCA2 is constructed from aerospace grade peened stainless steel. The 440mm (17%) wide front panel is edged with bead-blasted machined aluminum the fascia being finished in polished acrylic. Optional alternative colors and surface treatments are available to special order.


Main Output Level  
Balanced 15V into 600 ohms
Unbalanced 7.5V into 600 ohms

Effective Input Noise (all inputs) >120dB
THD >114dB (0.0002%)
Crosstalk >100dB @ 1kHz
Frequency Response DC - 500kHz
Linearity (Left-Right) >0.2B
Output Impedance 10 ohms

Signal To Noise Ratio >100dB
THD >95dB
Crosstalk >100dB
Frequency Response 10Hz - 80kHz
Output Level 0dB

Sensitivity (for 1 Volt output)  
Balanced 250mV
Unbalanced 150mV
Input Impedance  
Balanced >5K Ohms
Unbalanced >10K Ohms
Primary Stage Gain  
Balanced 0dB
Unbalanced +6dB

Main Output (Balanced)  
Balanced CD and Aux 1 XLR
Main Output (Unbalanced)  
CD, TV/AV, Tuner, Aux 2, Tape 1 and 2 RCA Phono

Supply Selectable between
Frequency 50/60Hz
Consumption 10VA-35VA

WxDxH 440x360x100mm
Packed 11.5Kg
Unpacked 9.5Kg
For those whose enjoyment of recorded music is paramount, auditioning the SCA2 will prove both a revelation and a source of enjoyment for years to come. For those who appreciate not only fine audio performance, but also innovative design and outstanding build quality, the SCA2 will continue to impress long after the novelty of lesser products has waned.

The SCA2 by ATC. A landmark in audiophile preamplifier design.

ATC SCA2 Preamp


SCA2 with phono stage

Contact for sale price!      Call 508-274-4330.

CA2   SCA2   SIA2-150   SPA2-150   P1   P4   P6

The SCA2 preamplifier was initially conceived to fulfill 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 SCA2 preamplifier was capable of enhancing the performance of any audiophile separates system. In fact, the outstanding ability of the SCA2 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.

A key feature of the SCA2 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 minimize 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 SCA2 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.

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 SCA2, dynamic range is outstanding.
'Volume', 'Monitor' and 'Record' selection can be operated manually at the front panel using rotary controls (Volume, via a precision motorized potentiometer, Monitor, and Record, via processor-controlled switches). Three push buttons activate Standby/Reset, Mute, and Gain, the latter providing 12db attenuation for convenient low-level listening. Alternatively, all functions may be accessed remotely from the system's optional SCA R handset. Output is automatically muted during any input selection function.

For the ultimate in vinyl replay, ATC's own SPH 2 optional in-board phono stage can be specified to special order. This definitive design is capable of extracting the very most from today's state-of-the-art moving coil and magnetic cartridges. Being a totally discrete design with no integrated circuits, the SPH 2 uses ATC proprietary capacitors, features split passive/active equalization, and provides for both resistive and capacitive cartridge matching. On board power supply regulation is separate for each channel.

The SCA2 preamplifier offers both balanced and unbalanced main outputs. Balanced output is via XLR connections and offer high output drive capability (15V from 10 Ohms). Consequently, the SCA2's ability to drive long cable runs of up to 50 meters without any signal loss makes it an ideal partner for active loudspeaker systems. Unbalanced output is provided by RCA phono connections assuring full compatibility with power amplifiers which do not offer balanced operation.
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