BLOCKAUDIO — Pre Amplifiers

LINE & POWER BLOCK SE

A revolutionary battery-isolated preamplifier delivering pristine, infinite background silence.

A vanishingly low noise floor allows recorded space and microdynamics to breathe with unprecedented realism. The LINE & POWER BLOCK SE is the absolute control heart of the BLOCKAUDIO ecosystem, executing preamplification with zero compromise by severing all connection to AC power lines during playback. Handcrafted in the Czech Republic, this monumental two-box component divides its tasks with strict architectural discipline. The Line-Block houses the pure Class A audio circuitry, whilst the Power-Block acts as an independent energy reservoir, sustaining the delicate signal path entirely on pure battery power. By executing signal attenuation through a symmetrical relay network shielded in mu-metal, this preamplifier preserves pristine channel balance and phase. The resulting presentation yields a vast, deeply layered soundstage where instruments emerge from an ink-black void, free from artifacts or modern electrical glare.

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Key Features

Pure battery isolation

Utilises independent onboard battery banks for each channel, providing over 15 hours of absolute disconnect from mains pollution with intelligent auto-recharging when idle.

Dual-chassis dual-mono topology

Physically splits the audio control circuitry from the power supply across two heavy enclosures to eliminate electro-magnetic interaction and achieve infinite channel separation.

Mu-metal shielded attenuator

Employs an ultra-symmetric instrumentation relay network encapsulated in protective mu-metal cans for click-free, structurally perfect volume adjustments.

DC coupling with servo control

Features a direct-coupled signal path from input to output, removing phase-distorting capacitors entirely to maintain sub-bass weight and pristine signal timing.

Remotely adjustable phono stage

Includes a fully integrated premium Moving Magnet and Moving Coil phono stage with resistance and capacitance values adjustable directly from the listening position.

Class A headphone output

Equipped with a dedicated high-bias discrete headphone amplifier accessible via front-mounted 3-pin balanced XLR or 6.35 mm stereo jack connections.

Chapter 01

Power Separation Architecture

The physical detachment of the preamplifier into two distinct components is not an aesthetic choice, but an electrical necessity. The upper Line-Block manages the incoming source voltage with ultra-short signal paths and zero internal hookup wiring. Below it, the Power-Block carries twin decoupled and suspended toroidal transformers that serve purely to charge the internal batteries, ensuring AC ripple current never comes into contact with the music.

Chapter 02

System Integration and Protection

Operating as the control brain for the matching MONO BLOCK SE power amplifiers, this preamplifier runs advanced system management through a dedicated communication terminal. It intelligently coordinates soft-fading power transitions, monitors real-time amplifier operating temperatures on its central display, and lets the listener toggle phase inversion or individual input gain sensitivity through an elegant, multi-level control interface.

Chapter 03

Listening Notes

The immediate impression is one of unforced, absolute transparency. Because the battery power supply cuts through common-mode line noise, acoustic recordings are presented with their original decay envelopes entirely intact. The preamplifier adds no artificial warmth or analytical edge, behaving as a fundamentally honest conduit that reveals the exact texture of strings, wood, and studio space.

Specifications

DistortionTHD+N <0.0005 %, IMD <0.0007 % (at 6 Vrms out)

Frequency ResponseDC – 300 kHz ±0.5 dB, DC – 20 kHz ±0.01 dB

Signal/Noise Ratio>132 dB A weighted, >129 dB unweighted (related to full output)

Residual Noise<8 μV unweighted

Channel SeparationInfinite (>130 dB)

Max. Voltage Gain+12 dB Balanced, +18 dB Unbalanced

Input Impedance40 kΩ Balanced, 20 kΩ Unbalanced

Output Impedance50 Ω Balanced, 25 Ω Unbalanced

Maximum Output Voltage20 Vrms Balanced, 10 Vrms Unbalanced

Inputs4 Balanced (XLR) pairs 5 Unbalanced (RCA) pairs (Furutech FP-908-R)

Phono Input1 Unbalanced (RCA) pair (Furutech FP-908-R)

Outputs2 Balanced (XLR) pairs 2 Unbalanced (RCA) pairs (Furutech FP-908-R)

Phones Output:3 pole XLR receptacle and 6.35 mm / 1⁄4″ stereo jack

Battery Operation Time>15 hours

System Remote ControlYes*, Neutrik RJ45

Power Consumption150 W max. at charging, 50 W at idle, <0.5 W in Standby

Mains Voltage230 / 115 V AC ±10 %, 50 / 60 Hz (factory pre-configured)

Dimensions – Line460/18.1(w) × 105/4.1(h) × 360/14.2(d) mm/inch

Dimensions – Power460/18.1(w) × 105/4.1(h) × 360/14.2(d) mm/inch

Weight in total28 kg / 62 lbs., ~40 kg / 88 lbs. shipping

ColorVarious RAL colors available