Spectral DMC30s & DMA150s2

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Mint condition, x-demo, very light use.

£18,000.00 £8,590.00

Call Choice Hifi on 020 8392 1959 or to enquire about this product!


Spectral products blend high technology with hand craftsmanship of an incomparable standard. The immense care taken in their manufacture is an integral outcome of the technological vision that inspires them. Spectral’s style of wide bandwidth, super-fast circuit design requires the finest materials and components, extremely close tolerances, and perfectionist standards of soldering, wire-harnessing, welding, finishing and all the other operations that go into manufacturing and assembly. Design engineers everywhere are constrained not only by the limits of the imaginations and the laws of physics, but by what is practically feasible in production. The Spectral design team enjoys the freedom of being far less constrained than most. Our military – and NASA – certified production technicians, representing decades of cumulative experience in Silicon Valley industry, are the most dedicated and skilled in the audio field today. Working unhurriedly on very limited production runs, they welcome the complex challenges posed for them by Spectral’s innovative product designs.

Purchased parts and components must also meet the same exacting criteria as our in-house production. Spectral searches the world for premium quality suppliers, routinely having parts custom made to our designs and specifications. We carefully screen and hand match components and devices, skimming the créme de la créme for use in our products. Incoming inspections, production quality control and final burn-in and testing are rigorously performed to merciless standards. Every Spectral product that leaves our premises must first pass a personal listening test by Spectral’s president and founder. The goal: that every Spectral unit perform as well as the best of its type we have ever produced.

Some might question whether such fanatical devotion to quality is really worth the effort. Spectral has been described as building “museum-quality” pieces. Our view is that recordings and playback systems are the museum of our musical heritage. It is a boon to all that the contents of this museum are accessible to us in our own homes. And it is our privilege at Spectral to play a role in making them available at the highest possible level of reproduction.

Brand: Spectral Audio

Model Name/Number: DMC30s pre and DMA150s2 power

Price (RRP): £14000

Choice Hifi Price: £8590

Product Information:

The Spectral DMC-30S Studio Reference Preamplifier

On the occasion of our twenty-fifth anniversary Spectral released a special reference preamplifier design for serious music enthusiasts. The DMC-30SL commemorates twenty-five years of state-of-the-art preamp design at Spectral beginning with the company’s first revolutionary products which were introduces in the mid 1970s. The DMC-30SL has again redefined the art of preamplifier design with a comprehensive array of engineering breakthroughs which set new sonic standards and raise the bar on signal accuracy in the most demanding systems. Now Spectral introduces the DMC-30S Studio Reference Preamplifier based on the engineering refinements developed for the DMC-30SL anniversary reference preamp. The original DMC-30 now encompasses the innovative signal advances pioneered in the DMC-30SL while continuing to combine state-of-the-art performance with exceptional value.

The heart of the new DMC-30S preamplifier is Spectral’s remarkable SHHA signal technology. The SHHA module (Spectral High-speed Hybrid Amplifier) takes Spectral’s wideband, fast-settling discrete circuit topology to a new level of performance and signal linearity. Using newly available premium discrete components, Spectral engineers have developed a dense, highly optimized surface mount layout topology for higher signal speed and ultra-fast signal extinction. Reduced size of the new all fet, fully balanced topology results in improved cross-coupling and noise isolation for ultra-quiet operation. Even more remarkable given the compact layout of the SHHA module is the exceptional nature of its power capabilities. The SHHA module is a high-current powerhouse producing full output at 1 MHz and one full ampere, setting new standards for headroom and drive capability in a preamplifier line section.

For music enthusiasts and audiophiles alike, the benefits of the DMC-30S are invaluable. The DMC-30S offers an extraordinary level of dynamics, dimension, lifelike detail and transparency while offering a rare combination of remote control convenience and functionality. Superb low frequency detail and articulation exceed the benchmark performance of the remarkable DMC-30. Through improved circuit settling speed, resolution and transient decay are presented with the natural timbre of the event while providing more low level information than ever before. Staging and image holography are further improved over the original DMC-30 and set a new standard.

DMC-30 Reference Preamplifier (Note spec not for “S”)

Front Panel Controls

  • Output Level
  • Balance left/right
  • Input selectors
  • Monitor switch
  • Stereo/Mono switch
  • Absolute Phase switch
  • Mute Switch
  • Surround LED indicator
  • Protection LED indicatorFront Panel Display
  • Output Level display – 50 step LED
  • Output Balance display – 50 step LEDRear Panel
  • 5 RCA Input connector sets (gold)
  • Balanced Input Neutrik XLR connectors (gold)
  • Tape input and output RCA connector set (gold)
  • Main Output RCA connectors (gold)
  • Balanced Output Neutrik XLR (gold)
  • AC Power input connector, switch and line fuseDMC-30R Remote ControlControl Buttons
  • Output Level
  • Channel Balance
  • Mute
  • Input selectors
  • Stereo/mono
  • Phase Invert
  • Tape Monitor
  • Display Brightness
  • Control Rate
  • Control Reset
DMC-30 Preamplifier Technical Data
Input Compliment: 7 inputs
Output Compliment: 3 outputs – normal, balanced, tape
Input Impedance: 15k ohms
Input Attenuation: 0, -12 dB
Output Impedance: 100 ohms
Control Compliment
Output Attenuation: Motorized fader conductive plastic, modified log taper
Output Balance: Relay attenuator system with center position bypass
Mute Switch: 0, -20 dB attenuation
Mode switches: Stereo/mono, absolute phase
Input Selections: 6 plus tape monitor
Recording Amplifiers
Input Impedance: 11K ohms, 100 ohms minimum load
Output Impedance: 2K ohms
Protection Circuit
Protection Mode: CD offset, oscillation
Method: Crowbar output relays
Sensitivity: 20 mV continuous DC
Recovery: Approx. 10 seconds
Chassis Temperature: Internal 40 deg. Celsius @ 25 deg. room temp
Model 201 Balanced Output Module
Fully Balanced Operation: All DC coupled
Frequency Response: DC to 2.5 MHz +-0.10 dB
-3 dB at 15 MHz
Any level to 36 V RMS
Slew Rate: 1000 V/us or greater
Rise Time: 70 ns
Distortion: Less than .01% THD and IM
Crosstalk: Greater than 90 dB
Noise: 105 dB A Weighted,
ref 100 mV @ 1 KHz
Output Voltage: 1.6 VRMS, 100 V
peak to peak maximum
Output Current: 1 Amp maximum per channel, balanced out
Gain Options: 15 dB, 21 dB
Model 303 Balanced Input Module (optional)
Fully Balance Operation: All DC coupled
Frequency Response: DC to 10 MHz +-0.10 dB
-3 dB at 15 MHz
Slew Rate: 500 V/us or greater
Distortion: Less than .01% THD and IM
Input Impedance: 10K ohms
Gain: 0, -10dB
attenuation continuaously variable
Power Supply Technical Data
Line Voltage: 100 volts, 120 volts
AC Voltage Range: +-10%
Quiescent Consumption: 80 Watts
Protection: Short circuit, over voltage, line transient protected
Operating Temperature: 0 deg. to +50 deg. Celsius
32 deg. to +122 deg. Fahrenheit
AC Main Fuse: 5 x 20mm 1A slo blo
DMC-30 Preamplifier Mechanical
Weight: 26 lbs. (11.8 KG)
Dimensions: 4 1/10″H x 19″W x 12 1/4″D (10.4 cm x 48.3cm x 31.1cm)



DMA-150 Stereo Power Amplifier (Note Spec not for “S2”)

Power Output:

    • @ 8 ohms – 150 Watts RMS


    • @ 4 ohms – 300 Watts RMS


    • @ 2 ohms – 570 Watts RMS


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




    • Less than 0.015% from DC to 100 KHz, typically 0.009% @ 200 WRMS/8 ohms



    • 8 Tone Cluster Test 20 KHz @ 500 Hz separation; 0.01% 8 ohms; 0.015% 4 ohms



Rise Time:

    • Less than 400 nanoseconds



    • 1.5 microseconds to -40dB


Slew Rate:

    • 600 volts/microsecond



Signal to Noise:

    • 97dB unweighted, 107dB ASA A



    • 98dB @ full power 8 ohms




    • 100K ohms in parallel with 100 pf



    • 1.5 volts/nominal output



Power Supply:
Line Voltage:

    • 100 volts, 120 volts, 240 volts (factory set)


AC Voltage Range:

    • ±10%


Maximum Consumption:

    • 1600 Watts


Quiescent Consumption:

    • 250 Watts



Operating Temp:

    • 0° to 50° Celsius range; 32° to 122° Farenheit



Protection Features:
DC Protection Servo:

    • 0.5 volt range


Current Limit Onset:

    • 60 Amps


Thermal Threshold:

    • Protects at 85° Celsius, 185° Farenheit


AC Main Fuses:

    • 2 @ 2-1/2A 3 AG slo-blo, for 100 – 120 VAC


    2 @ 1-1/4A 3AG slo-blo, for 220-240 VAC


Size and Weight:

    • 48.22cm (19″)W x 18.4cm (7 1/4″)H x 45.8cm (18″)D



    62 lbs, 28.1 KG Net


Age: 15 Years

Condition: 9/10

Voltage: 220/240/50Hz

Finish/Colour: Black/Silver

Packaging? Yes

Accessories? N/A

Item Location: In Stock

Status: X-Demo

Dimensions 5708473 cm