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Dionysos

CONTROL AMPLIFIER WITH REMOTE

The control amplifier is the centerpiece of every high-end audio system. It is responsible for source selection, signal conditioning and volume control. It has the task to match the output of your source to the input of your power amp. Its output stage has to drive any power amplifier through any length of cable with optimal quality via balanced or unbalanced lines, while resisting any interference.

The input of Dionysos provides optimal loading for the source component to develop its full potential, allowing it to extract the maximum amount of information while keeping all noise picked up along the way out of the signal chain. The transformer input provides complete isolation from the rest of the system, rejects common mode signals much better than any active solution, stops EMI/RFI and ensures a truly balanced differential input, while having very low DC resistance.

The control amplifier is the centerpiece of every high-end audio system. It is responsible for source selection, signal conditioning and volume control. It has the task to match the output of your source to the input of your power amp. Its output stage has to drive any power amplifier through any length of cable with optimal quality via balanced or unbalanced lines, while resisting any interference.

The input of Dionysos provides optimal loading for the source component to develop its full potential, allowing it to extract the maximum amount of information while keeping all noise picked up along the way out of the signal chain. The transformer input provides complete isolation from the rest of the system, rejects common mode signals much better than any active solution, stops EMI/RFI and ensures a truly balanced differential input, while having very low DC resistance.

The volume control of Dionysos adjusts the level of the input signal to the value required by the power amp without burying low level information in noise while transferring enough power to properly drive the amplification stage without affecting its operation.

Potentiometers and resistor ladders, as sophisticated as they might be, have a fundamental flaw. They operate by unnecessarily dumping the excess signal across a resistor. It is like driving a car with fixed engine power (signal) and adjusting the speed with the brakes (resistor) wasting most of the engine power! Our solution is fundamentally different and as simple as it gets. We use a transformer with various winding ratios and we switch between them. In the example above it would be illustrated by a gearbox, transferring all the power of the engine at all speeds. In other words remains in CONTROL at all volume settings.

The gain stage is realised by the use of a single low noise dual triode coupled with a transformer, making the output of the control amplifier low impedance, DC free, truly balanced, isolated from the noise sources and decoupled from other components in the system. This is the absolute optimum driving method for the following power amplifier’s input stage. To further reduce the astonishingly low noise floor of the unit the active circuit is disabled below a certain volume setting and the attenuator is connected directly to the output providing low impedance noise free signal. This “gearbox” approach guarantees consistent performance at all levels making sure each component operates in it’s optimal range.

The power supply of Dionysos uses a choke input rectifier arrangement. This eliminates switching noise and any other disturbance that originates before the choke, so the power reaching the reservoir capacitor is perfectly clean. Audio signal modulates the power supply of all devices, so  we opted for a very unique way of power supply regulation eliminating the problem entirely. Dionysos uses a current sourced shunt regulator. In other words the current consumed at any given time is constant. Avoiding any variations makes intermodulation impossible while the shunt element passes all signal currents getting rid of energy storage devices (e.g. capacitors) that might affect the sound thus allowing all the finest textures to be rendered unaffected by signal content or amplitude.

All this is governed by a microprocessor switching to the appropriate combination of relays and monitoring the unit’s status and incoming commands. The chassis is milled from solid plates of different thickness aluminum that are interlocked together to form a ring like rigid structure. We have the power supply mounted on the left sidewall of this structure and the signal transformers on the right side, crossed by two semi-flexible bars on which the motherboard and its heat sink are attached via vibration isolating gel bushings. The top and bottom plates link all sides of the ring with the flexible bars and the feet made from conductive plastic on flexible screws. There are no screws visible anywhere on the chassis. And the chassis feels like a solid block protecting the circuitry from the environment both mechanically and electrically.

  • Accepts both balanced and unbalanced input signals on RCA and XLR connectors
  • Switches ground plane with input selection preventing ground loops
  • Programmable ground arrangement for large systems powered from different mains
  • Dual balanced and unbalanced output for bi-amplification or headphone amplifiers
  • Home Theater bypass feature for integration in Home Cinema systems
  • Shunt-regulated constant current PSU for lowest noise and best dynamic behavior
  • Choke input rectifier for lowest switching noise
  • Late night mode -12db pad
  • Programmable absolute phase per input and accessible via remote control
  • Stepped volume control for perfect repeatability of level setting
  • Inductive volume control for best sound quality
  • Custom vacuum encapsulated signal relays for ultimate sound and reliability
  • Modular construction
  • Microprocessor controlled
  • Interlocking solid aluminum chassis

TECHNICAL SPECIFICATIONS

Weight: 15kg (33lbs.)
Dimensions: 430 x 400 x 115 mm
Power: 45W 115/230V 50/60Hz
Max. input level: 10V Rms
Max Output level: 10V Rms
Gain: +16db to -48db in 32 steps
Minimal input impedance: 8k Ohm
Max output impedance: 180 Ohm
Signal to Noise: 112db
Frequency response: 20-20,000Hz +/- 1db