Micro Precision Z-Studio Z-ST 4c 4-Channel Amplifier - Version 2 Coming Soon Specifications
Micro Precision Z-Studio Z-ST 4c four channel amplifier - Uncompromising Quality.
The Micro Precision Z Studio Amplifier, also known as the Z-ST 4c and 2c, are high-end, four-channel and two-channel amplifiers that represent the culmination of years of meticulous design and engineering. Initially conceived in 2013, the project sought to break away from conventional standards, driven by the expertise of Thomas Hoffman and his team. Following the unfortunate passing of an early collaborator, the development continued with a new team from Italy, resulting in an amplifier that prioritizes durability, serviceability, and exceptional sound quality. The Z Studio amplifier is built with a philosophy of “form follows function,” avoiding the use of SMD components to ensure ease of repair even decades into the future. Key features include a robust power supply with MUNDORF capacitors, a discrete high-voltage driver stage, and a careful selection of top-tier components like Sanken transistors and precision resistors from Mundorf and Caddock Electronics.
This amplifier is not only technically impressive but also delivers an extraordinary auditory experience. It offers an expansive soundstage, precise sound imaging, and a dynamic response across all volume levels. The Z Studio amplifier is designed to operate with minimal interference from its power supply, maintaining the integrity of the signal path. Even at low volumes, it provides a refined, delicate sound, while at higher volumes, it unleashes powerful, immersive audio without distorting the sound field. This amplifier is ideal for audiophiles who demand the highest quality in both construction and sound, offering an unparalleled listening experience that embodies the very essence of Micro Precision’s commitment to excellence.
Z-ST 4c Design Philosophy
- “Form follows function.”
- Designed for repairability even after 20 years.
- Avoidance of SMD components to facilitate easier repairs.
- Recognition of the significant influence of an amplifier as a necessary technical construction.
- Not an ideological lifestyle product.
Z-ST 4c Power Supply
- Three 30 Ampere primary fuses (90A).
- Eight 80 Ampere switching transistors (2x240A).
- Eight high-speed switching diodes to minimize switching noise.
- Two high-current filter chokes to reduce disturbances from switching frequencies.
- Four primary 22,000 uF storage capacitors from the MUNDORF range.
- Eight secondary 4,700uF storage capacitors from the MUNDORF range.
- Various necessary voltages generated by the power supply.
Z-ST 4c System Voltages
- +5 Volts for the microcontroller and reference for regulation.
- +12 Volts for relay switching.
Z-ST 4c Audio Voltages
- +/- 15 Volts level control.
- +/- 67 Volts bias.
- +/- 47 Volts pre-stage / driver stage.
- +/- 40 Volts power amplifier.
Z-ST 4c Driver Stage
- High-voltage technology in discrete circuitry.
- No operational amplifiers (IC) in the signal path.
- Only high-impedance FET-transistor built OP amplifiers.
- Bias adjustable via precision potentiometer.
- AUDIONOTE KAISEI coupling capacitors.
Z-ST 4c Power Amplifier
- Sanken transistors, four pieces at 160 Watts per channel.
- CADDOCK 1% precision emitter resistors, 16 pieces.
- PANASONIC high-current relays for speaker on/off.
- High-quality speaker screw terminals with 4mm banana through cable optimally connected to the board. No losses on conductor tracks.
Z-ST 4c Input Circuitry
- Bridgeable from 4-channel to 2-channel.
- Bridgeable from 4-channel to 2+1 channel.
- LED control indicator for sequential bridging operation.
- Input level adjustable via programmable resistance matrix in 0.5 dB steps.
- No problematic potentiometers in the signal path.
- No filter functions in this amplifier. Linear phase & amplitude.
- High-impedance FET transistor input stage to minimize unnecessary load on the signal source.
- 20.0 kOhm constant input resistance regardless of level control.
- Input capacitance 5pF.
- Input stage coupling capacitors: AUDIONOTE KAISEI & MUNDORF MCAP EVO.
- Optional amplifier without resistance network for a “direct input” without level control.
Z-ST 4c Micro-controller Display
- Displays operating voltage (min. 9.0V – max. 16.0 Volt) and working temperature.
- Displays channel-related level reduction (channels 1-4).
Z-ST 4c Protection Circuits
- Overheating: Programmable 85 degrees via microcontroller.
- Overload; Short circuit.
- Undervoltage: Shutdown at 10V, which can be disabled via the controller.
- Temperature: Around 45 Celsius in normal operation with passive cooling. No fan needed due to large heatsink and side panels. Shutdown at 85 degrees Celsius.
Z-ST 4c Dimensions
- 325 x 550 x 90mm.
Z-ST 4c Idle Current
- Total: 5 Amperes = 4 channels at 1.25 Amperes each.
- The idle current depends on the bias pre-setting, affecting harmonic (K2) or unharmonic (K3) distortion. The bias influences sound, idle current, and operating temperature.
Z-ST 4c Performance Metrics
- Self-noise: A-weighted -90dBV.
- Frequency response: 5 – 250,000 Hz at -1dBV, 5 – 420,000 Hz at -3dBV.
- Power at 4 Ohm load: 160 Watts at 1% THD+N.
- Power at 2 Ohm load: 280 Watts at 1% THD+N.
- Power at 4 Ohm BR: 580 Watts at 1% THD+N.
- Power at 2 Ohm BR: Not permissible.
- Damping factor at 10W: 2700.
- DC Offset
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