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


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.

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Micro Precision 7-Series Mono Amplifier

Uncompromising Quality.

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.


We strive to bring you the cutting edge in automotive technology. 

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.