Micro Precision Z-ST 4c: a 4-channel, top-of-the-line amplifier with 160W/280W power at 4/2 Ohm, discrete circuitry, adjustable bias, and passive cooling. Features linear phase/amplitude and low-noise design for precise audio clarity.
Available on backorder
The Micro Precision 7-Series Mono Amplifier, a marvel in audio technology, blends technical sophistication with a sleek, user-centric design. Designed for the audiophile seeking unparalleled sound quality, this amplifier incorporates advanced engineering principles to deliver exceptional audio performance.
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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.
. 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.
. 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
Z-Studio 170 Updates:
The Z-Studio 170 has seen several updates to enhance its performance further:
September 2011: Introduction of a new surround geometry, reducing mechanical resistance.
November 2013: Inclusion of a new spider and voice coil, lowering mechanical resistance due to these new components and geometry. The QTC was adjusted to 0.7, with updated parameters available on page 3.
December 2015: A revamped magnet system with internal triple shielding, improved venting, and a new visual design for the backside.
November 2019: Introduction of a new basket construction, enhancing the overall structural integrity and performance.
This product embodies Micro Precision’s commitment to innovation and quality in audio technology, making the Z-Studio 170 an ideal choice for audiophiles seeking top-tier midbass performance.
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