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The Spectral DMA-200S Series 2 Reference Amplifier
TThirty years ago Spectral introduced the DMA-200 Class A reference power amplifier. The high-speed, high powered DMA-200 was a new kind of audio amplifier inspired by high technology innovations and instrumentation design in Silicon Valley. A radically different approach to amplifier design, the DMA-200 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. Today, the new DMA-200S builds on the achievement of the original DMA-200 and illustrates Spectral’s insistence on state-of-the-art signal resolution with high value.

As the foundation of the Spectral amplifier family, the DMA-200S represents striking progress in the development of an ideal power amplifier for highperformance music systems. Drawing on the many design advances developed for Spectral’s ambitious DMA-360 S2 Monaural Reference Amplifier, the performance and technology of the DMA-200S are fundamentally superior to that of conventional SS and tube power amplifiers, achieving significantly lower distortion levels and radically faster signal response.

The uncompromising high-speed amplifier topology of our DMA-360 S2 Reference Amplifier forms the basis for the remarkable DMA-200S. This new generation topology features innovative input, gain and output driver stages based on a new family of premium discrete silicon devices. The pure class A driver and gain sections now operate up to ten times faster than previous Spectral designs and offer dramatic improvment in transient resolution and an ultra-low noise floor. Amplifier settling and recovery are perfect. The result is immersive sonics of extraordinary purity and detail which emerge from an absolutely uncompressed soundfield, free of artifact or fatigue.

 From much listening and design experimentation, Spectral has consistently pioneered component systems having fast settling, high-speed circuit architecture. These have invariably outperformed more traditional often cumbersome high-end design methods to achieve superlative detail, soundstaging and listener involvement. 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. Only then can one preserve instantaneous waveform accuracy to prevent cover-up of delicate musical signals by previous events. Construction and performance of the Spectral DMA-200S Reference Amplifier for this demanding criterion and resulting sonic resolution are unmatched among contemporary high-end amplifier designs.

Unparalleled Resolution, Unprecedented Control
The very high-speed launch and high current reserves of the DMA-200S are possible with the use of Spectral’s proprietary “Focused Array” construction. This breakthrough topology aligns high-current vertical fet output devices for rapid, pistonic signal launch. The output section is comprised of eight individual V-fet amplifier modules paralleled to achieve a minimum 180 watt RMS /per channel with 60 amp capability. With this “Focused Array” arrangement of parallel fet amplifiers, full rated power is delivered with total load stability at an unprecedented 1 MHz.

Like the renowned DMA-360 Reference Amplifier, the DMA-200S utilizes Spectral’s unique “Focused Array” output section design with powerful ultra-fast Mega Fet devices. 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. Individual teflon bias trimmers are used to calibrate each output device separately. Groups of these individual output device / power supply circuits utilize field folding construction and electronic shielding to further impede propagation of stray interference. The resulting “Focused Array” of individual isolated output sections performs as one with virtually no cross-coupling and energy storage artifacts reflecting between output devices. 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. Gone are performance damaging magnetic and electrical field propagation problems of conventional multiple device power amplifiers. Without stray radiation, critical small signal paths within the DMA-200S and other sound system components can perform with lowest possible distortion and settle to signal extinction in microseconds. Hence, the DMA-200S works with power and speed yet behaves inert to other electronic parts of the system. 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.

Premium Discrete High Speed Circuitry
Small signal circuitry is based on Spectral's proven discrete circuit multiple cascode, double push-pull fet technology. Premium silicon array construction, similar to circuitry in the DMA-360 Reference Amplifier, is applied to the DMA-200S to achieve enormous internal dynamic range capability. This reserve is linear class A with many times greater dynamic capability than program demands. 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. Unhindered by interferences and slow cumbersome response of conventional practice, these parts operate with unyielding control
and exacting precision. Reproduction is absolutely pure, effortless and highly focused and holographic.

Audio amplification paths through the DMA-200S are direct, inherently linear and simple. These minimalist configurations have always sounded and measured the best but normally become ponderous and overburdened when protection and support functions are added. The DMA-200S takes a different route to solve the sonic problems of amplifier protection circuitry. To maintain the pristine signal path, a sophisticated analog computing ancillary system is thermal and optocoupled within the amplifier. This “hands off” operational management system observes device loading and power dissipation as well as speaker damaging out of range signals. It takes control without circuitous cross interfering connections to electronics in the signal path, leaving the musical signal absolutely pure and totally untouched.

The Reference Amplifier for the Rest of Us
The Spectral DMA-200S Reference Amplifier is a ‘game changer’ just as its revolutionary predecessor was decades ago. With its extreme ultra-low distortion and extraordinary signal response courtesy of the benchmark DMA-360 S2, the DMA-200S sets a very high standard indeed. Today’s DMA-200S distills the essence of what Spectral engineers have discoverd over decades of painstaking engineering research in pursuit of ultimate amplifier design. The DMA-200S is also eloquent proof that state-of-the-art performance and ultimate refinement need not cost a kings ransom. Although of moderate cost, the DMA-200S offers uncompromising sonic sophistication and drive precision for the most critical of music system applications. The DMA-200S is the reference amplifier for the rest of us.


Power Output (continuous): @ 8 ohms - 180 Watts RMS
@ 4 ohms - 320 Watts RMS
@ 2 ohms - 590 Watts RMS
(Minimum at clipping)  
Output Current: 60 Amps peak per channel
Frequency Response: ±0.1 dB, DC-150 KHz
±1 dB, DC-1 MHz
±3 dB, DC-1.8 MHz
Distortion Static: Less than 0.015% from DC to 100 KHz,
typically 0.009% @ 200 WRMS/8 ohms
Distortion Dynamic: 8 Tone Cluster Test 20 KHz
@ 500 Hz separation
0.01% 8 ohms
0.015% 4 ohms
Rise Time: Less than 400 nanoseconds
Setting: 1.5 microseconds to -40dB
Slew Rate: 600 volts/microsecond
Signal to Noise: 97dB unweighted, 107dB ASA A
Crosstalk: 102dB @ full power 8 ohms
Input Impedance: 10K ohms in parallel with 100 pf
Sensitivity: 1.5 volts/nominal output
Line Voltage: 100 volts, 120 volts, 240 volts (factory set)
AC Voltage Range: ±10%
Maximum Consumption: 1600 Watts
Quiescent Consumption: 115 Watts
Operating Temp: 0° to 50° Celsius range;
32° to 122° Fahrenheit
Gewicht: 28,1kg
Breedte: 482 mm
Hoogte: 184 mm
Diepte: 458 mm

> DMA-200 Series 2 documenten

> Prijslijst Spectral
> Interview met ontwerper Richard Fryer Music Emotion


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