Micro Precision Z-Studio Z-ST 4c 4-Channel Amplifier

Thomas: Overall Concept

Roberto: Development & Production

Colpo: Development & Production

Licio: Administration

Cemil: Morale and Advice

• “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.

• 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.

• +5 Volts for the microcontroller and reference for regulation.
• +12 Volts for relay switching.

• +/- 15 Volts level control.
• +/- 67 Volts bias.
• +/- 47 Volts pre-stage / driver stage.
• +/- 40 Volts power amplifier.

• 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.

• 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.

• 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.

• Displays operating voltage (min. 9.0V – max. 16.0 Volt) and working temperature.
• Displays channel-related level reduction (channels 1-4).

• 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.

• 325 x 550 x 90mm.