SPECTRAL DMA 200S SERIES 2

July 26, 2019 posted by

The result is immersive sonics of extraordinary purity and detail which emerge from an absolutely uncompressed soundfield, free of artifact or fatigue. The twin power transformers are mounted between massive machined mounting plates for damping and resonance control. Transformer structure is then mounted on a constrained rubber floating suspension system employing multiple compliances similar to a fine turntable suspension. Construction and performance of the Spectral DMAS Reference Amplifier for this demanding criterion and resulting sonic resolution are unmatched among contemporary high-end amplifier designs. From much listening and design experimentation, Spectral has consistently pioneered component systems having fast settling, high-speed circuit architecture. This reserve is linear class A with many times greater dynamic capability than program demands.

The pure class A driver and gain sections now operate up to ten times faster than previous Spectral designs and offer dramatic improvement in transient resolution and an ultra-low noise floor. Gone are performance damaging magnetic and electrical field propagation problems of conventional multiple device power amplifiers. Transformer structure is then mounted on a constrained rubber floating suspension system employing multiple compliances similar to a fine turntable suspension. Dynamic range limitations are removed with a sonic clarity and quietude which is palpable. A radically different approach to amplifier design, the DMA introduced the first ultra-wideband, high power signal response in the audio industry and was an immediate worldwide success, changing the way serious designers defined amplifier performance. This breakthrough topology aligns high-current vertical FET output devices for rapid, pistonic signal launch. The high-current power transformers are now intimately sited next to their own high-current output devices with extraordinary noise isolation. Premium silicon array construction, similar to circuitry in the DMA Reference Amplifier, is applied to the DMAS to achieve enormous internal dynamic range capability.

As the foundation of the Spectral amplifier family, the DMAS represents striking progress in the development of an ideal power amplifier for high performance music systems.

Individual teflon bias trimmers are used to calibrate each output device separately. The result is immersive sonics of extraordinary purity and detail which emerge from an absolutely uncompressed soundfield, free of artifact or fatigue. Construction and performance of the Spectral DMAS Reference Amplifier for this demanding criterion and resulting sonic resolution are unmatched among contemporary high-end amplifier designs.

This virtually universal method extracts a significant sonic price, however, because of the speed and regulation losses which are imposed by the long power supply wiring harness.

Spectral DMA-200S Series 2 Stereo Power Amplifier [Expired]

Hence, the DMAS works with power and speed yet behaves inert to other electronic parts of the system. Until now, amplifiers could not offer both powerful speaker control capability and the sonic transparency and life possible only with high-speed, fast settling circuitry. Audio amplification paths through the DMAS are direct, inherently linear and simple.

The high-current power transformers are now intimately sited next to their own high-current output devices with extraordinary noise isolation. Premium Discrete High Speed Circuitry. Premium silicon array construction, similar to circuitry in the DMA Reference Amplifier, is applied to the DMAS to achieve enormous internal dynamic range capability. Breakthrough circuits backed by Spectral experience have now brought together the necessary combination of speed, accuracy, control and stealth.

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The Focused Power output section of the DMAS is only one of the many Spectral innovations designed to create the ultimate in amplifier control and resolution. Amplifier settling and recovery are perfect. Reproduction is absolutely pure, effortless and highly focused and holographic. Reproduction is highly articulate and resolving yet has all the powerful unlimited character of the finest very high power amplifier designs due to its superb overload and ultra-fast recovery characteristics.

To maintain the pristine signal path, a sophisticated analog computing ancillary system is thermal and optocoupled within the amplifier. These unique designs are the result of years of research and development to maximize isolation and regulation.

The Power Vault electromagnetic field containment system virtually eliminates EMI radiation to the amplifier signal path circuitry as well as power and regulation losses through the traditional power supply harness. In traditional high-end power amplifiers, output transformers are located spechral from active amplifier circuitry for purposes of noise isolation and construction ease.

Unhindered by interferences and slow cumbersome response of conventional practice, these parts operate with unyielding control and exacting precision. Spectral engineers have long recognized the problems associated with power supply noise contamination and have proposed a unique solution in the DMAS Sseries Resolution Amplifier.

This breakthrough topology aligns high-current vertical FET output devices for rapid, pistonic signal launch. Although of moderate cost, the DMAS offers uncompromising sonic sophistication and drive precision for the most critical of music system applications. Only then can one preserve instantaneous waveform accuracy to prevent cover-up of delicate musical signals by previous events.

Each device, having vacuum tube like operating character, is energized from its own dedicated high energy storage capacitor, rectifier, and individually powered from an isolated ultra-low coupled transformer winding.

Indeed, test methodology simulating music waveforms and hearing acuity confirm that quickness of response and rapid signal extinction when reproducing complex dynamics are mandatory for accurate music reproduction.

These have invariably outperformed more traditional often cumbersome high-end design methods to achieve superlative detail, soundstaging and listener involvement. The high-speed driver circuitry of the DMAS operates in a pristine environment free of the noise radiation and phantom signals which plague other power amplifiers.

A unique transformer architecture supports seriees critical requirements for lowest noise and high power capability of the powered output section array.

Spectral DMAS Series 2 Stereo Power Amplifier | Solid state | Audiogon

The DMAS is also eloquent proof that state-of-the-art performance and ultimate refinement need not cost a kings ransom. These minimalist configurations have always sounded and measured the best but normally become ponderous and overburdened when deries and support functions are added. The architecture starts with Spectral’s elaborate high performance custom power supply transformers.

With its extreme ultra-low distortion and extraordinary signal response courtesy of the benchmark DMA S2, the DMAS sets a very high standard indeed. It allows high current drive for quick controlled response from the very large output FET’s as well as isolation from their internal electronic activity. The twin power transformers are mounted between massive machined mounting plates for damping and resonance control. Gone are performance damaging magnetic and electrical field propagation problems of conventional multiple device power amplifiers.

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Dynamic range limitations are removed with a sonic clarity and quietude which is palpable. This reserve is linear class A with many times greater dynamic capability than program demands. It takes control without circuitous cross interfering connections to electronics in the signal path, leaving the musical signal absolutely pure and totally untouched.

The DMAS is the reference amplifier for the rest of us. The DMAS takes a different route to solve the sonic spectrla of amplifier protection circuitry. From much listening and design experimentation, Spectral has consistently pioneered component systems having fast settling, high-speed circuit architecture. The combined 38 lb. Transformer structure is then mounted on a constrained rubber floating suspension system employing multiple compliances similar to a fine turntable suspension.

The pure class A driver and gain sections now operate up to sspectral times faster than previous Spectral designs and offer dramatic improvement in transient resolution and an ultra-low noise floor. Improvements in high-current FET technology, high-speed amplifier topologies and new protection systems are combined in the DMAS High Resolution amplifier to successfully advance the art of amplifier design.

During extreme program dynamics, this arrangement can launch an instantaneous high current drive of over 60 amps per channel to the most sophisticated loudspeakers with assured precision waveform tracing. The resulting transformer Power Vault containment system results in an uncompromising solution to the universal power supply noise problem. A radically different approach to amplifier design, the DMA introduced the first ultra-wideband, high power signal response in the audio industry and was an immediate worldwide success, changing the way serious designers defined amplifier performance.

Each transformer features individually isolated windings to support each individual output transistor in the amplifier output section, a premium technique shared only with the Spectral DMA Reference Amplifier. Without stray radiation, critical small signal paths within the DMAS and other sound system components can perform with lowest possible distortion and settle to signal extinction in microseconds. In addition, the EMI and noise which radiate from the supply harness invariably contaminate xpectral low level circuitry by noise sfries the musical signal.

The high-speed, high powered DMA was a new kind of audio amplifier inspired by high technology innovations and instrumentation design in Silicon Valley.