DMC-30SV Series 2 "Super Veloce" Reference Preamplifier
Selected Design Highlights
- Full feature remote control operates all functions.
- Indicator displays are clearly visible from a distance.
- New generation high-level line output section topology.
- Improved SHHA G3 ultra high-speed hybrid amplifier modules with ultra precision compensation components.
- 80 volts peak-to-peak output voltage for unprecedented dynamics.
- Relays allow signal control selection at the optimal point in the circuitry, maintaining the shortest signal path.
- Microprocessor "sleep mode" and silent display architecture.
- Cost-no-object discrete custom component technologies.
- Custom ultra-precision mil-spec motorized studio audio volume attenuator.
- Ultra low-noise "silent power" supply system, with floating ground shunt regulation.
- Three-tiered architecture takes the signal path off the power supply circuit board.
- Balanced architecture takes maximum advantage of differential operation.
- Optically isolated protection systems for maximum signal purity.
- Custom semiconductor devices developed exclusively for this topology.
- Custom Teflon and polystyrene film capacitors in critical circuit locations.
- Proprietary ultra-precision Teflon Array film capacitor technology.
- Bulk metal ultra precision resistors in critical signal locations.
Design Overview of the DMC-30SV S2 “Super Veloce” Reference Preamplifier
Seeking The Missing Link With the widespread use of integrated circuit op-amp topologies in current high-end digital processors and digital source components, the role of the preamplifier to optimize the component interface has never been more critical to final system performance. Today’s digital converters have a challenging task delivering precision conversions of music files and downloads while also driving complex cables and low-impedance input loads utilizing rudimentary analog circuits and basic power supplies. Without the benefits of discrete, high-bias analog amplifiers, digital processors struggle to provide optimal drive and load isolation when faced with the full dynamics of high-resolution recordings. In addition to these output drive limitations, IC based digital processors require balanced output operation to avoid higher distortion levels which occur when used single-ended. It is also important to recognize that digital audio processors are not equipped to perform the role of preamplifier in high-end audio component systems. Power amplifiers require robust drive cap abilities from the best discrete class A preamplifier line sections to avoid impedance mismatching, current limiting and cable reflection problems associated with low bias IC op-amp output sections. The Model 304 Balanced Input Amplifier To address the shortcomings inherent in the output sections of todays high-end digital processors, Spectral engineers developed the model 304 balanced input amplifier. The model 304 is a discrete, high-speed class A unity gain buffer operating on unusually high voltage rails. This fully push-pull topology is derived from our innovative SDR-4000 I/V balanced amplifier and features superior performance to any IC buffer. The model 304 is design optimized as a discrete buffer amplifier unlike conventional IC input buffers. Custom discrete buffers are a rarity in audio today but still are found in the best ultra-premium recording consoles. Although difficult to design and hugely expensive compared to op-amps, the optimized discrete input buffer is the only uncompromised solution for interfacing digital audio components and amplifiers. Spectral engineers take the discrete input buffer to the next level in the 304 balanced input amplifier. Custom matched J-FET transistors are employed in the cascode front-end. Built to Spectral specifications for low gain applications, the handbuilt devices lower crossover distortion, noise and improve common mode rejection. Bandwidth, slew rate and distortion are all vastly superior to conventional buffers. The speed and resolution of the 304 balanced input buffer are exemplary and perfectly compliment the superlative performance of the 301C line section of the DMC-30SV S2. Instantaneous Accuracy: The Final Frontier In the DMC-30SV S2 reference preamplifier, Spectral brings together some of the most accurate and sophisticated circuits yet developed for music reproduction. Through painstaking research and development, new line-level output stages employ next generation instrumentation technology, which address historic distortion problems in solid-state semiconductor design, with heroic results. Amplifier topologies in the DMC-30SV are the fastest and deepest settling that we have developed. Premium passive component technologies used in critical locations are of unsurpassed quality. Today, no other preamplifiers have the ultra-fast signal response and the instantaneous signal extinction achieved in the DMC-30SV. This “instantaneous accuracy” sets the stage for remarkably transparent, articulate and vividly immersive sonics. The DMC-30SV S2 Reference Preamplifier: At the Leading Edge We are pleased to see more and more music enthusiasts are coming to understand that no music system can be any better than the performance of its preamplifier. There is growing sophistication in regards to absolute performance and price. At a time when ultra high price preamplifiers are routinely introduced at several times the cost of Spectral, the thoughtful music enthusiast is left to wonder exactly what benefits these lofty prices buy? We believe the sophisticated customer will find the answer in the uncompromising DMC-30SV. Few preamplifiers at any price can boast the designer credentials and unrivaled component quality of the DMC-30SV. Edge-of-the-art amplifier technology and advanced custom component design are utilized throughout the DMC-30SV to a degree rarely seen in stratospheric components. This is because Spectral engineers have identified those key components that most determine instrument stability and sonic transparency and have invested aggressively. When careful investment in superior circuit performance and signal path components becomes the design priority over elaborate metalwork sculpture, state-of-the-art clarity and signal resolution can be achieved with excellent value. The DMC-30SV Series 2 builds on the excellent fundamentals of the DMC-30SV reference preamplifier to achieve altogether superior transparency and resolution. Utilizing the new 301C line section output module featuring our exclusive “Teflon Array” technology and other topology refinements, the new DMC-30SV S2 performs with immersive sonics and dazzling realism. Now our goal of achieving 2C3D and true spatial coherence has been fully realized. Compare our new DMC-30SV series 2 reference preamplifier against the most costly and ambitious high-end preamps in the industry. We are confident you will discover the important musical difference superior engineering experience and design innovation make.
DMC-30SV Series 2 Preamplifier Technical Data Input Compliment 7 inputs - 5 normal (RCA), 1 balanced (XLR), tape monitor (RCA) Output Compliment 3 outputs - normal (RCA), balanced (XLR), tape (RCA) Control Compliment: Output Attenuation Motorized custom fader conductive plastic, modified log taper Output Balance Relay attenuator system with center position bypass Mute Switch 0, -20 dB attenuation High Level Trim 0 and -12dB attenuation for all high level inputs Mode Switches Stereo/Mono Absolute Phase Input Select 6 position, and Tape Monitor Output Level Display 50 step LED Output Balance Display 50 step LED Input Impedance 15K ohms Output Impedance 100 ohms Gain 20 db unbalanced, 26 db balanced Recording Amplifiers: Input Impedance 11K ohms, 100 ohms minimum load Output Impedance 2K ohms Protection Circuit: Protection Mode DC offset, oscillation Method: Crowbar output relays Sensitivity 20 mV continuous DC Recovery Approximately 10 seconds Chassis Temperature Internal 48 degree Celsius @ 25 degree C room temperature Frequency Response: DC to 5 MHz -3dB DC to 1 MHz -0.10dB Any level to 36 V RMS Slew Rate 1000 V/us or greater Rise Time 70 ns Distortion - Static Less than .005% THD and IM Crosstalk Greater than 97dB Noise 108dB A Weighted, ref 100 mV @ 1 KHz Output Voltage 1.6 VRMS, 100 V peak to peak maximum Output Current 1 Ampere maximum per channel, balanced out Gain Options 15 dB, 21 dB
Remote Control Operates all front panel functions, level and balance rates, display brightness and system reset DMC-30SV Series 2 Mechanical Specifications Dimensions: 19" W 12.25" D 4.1" H 48.3 cm W 31.1 cm D 10.4 cm H Weight: 26 lbs net. 11.8 kg net. Please note that all of the information and specifications provided herein are subject to change owing to the evolutionary nature of Spectral designs and technology.