Halcro DM10 Preamplifier and DM58 Monoblock Power Amplifiers (Pair) - Consignment

Halcro DM10 Preamplifier and DM58 Monoblock Power Amplifiers (Pair) - Consignment

Condition: Good, some marks and scratches (see photos)

Includes: Preamp Remote, Power Cables only (No Boxes)

SN: DM10 66 / DM58 00116, 00118

Overview

DM10 Preamplifier

The Halcro DM10 is a state-of-the-art preamplifier that represents the pinnacle of design and engineering in high-end audio. Featuring an advanced electronic design by Bruce Candy, it delivers unmatched audio purity with immeasurable distortion and exceptionally low noise. Every component, from Vishay resistors to FKP1 capacitors, has been meticulously selected to ensure the highest reliability and performance. The power supply integrates switch-mode technology with extensive filtering, achieving double regulation for remarkable stability, while electromagnetic interference is virtually eliminated through innovative design measures.

The DM10's industrial design harmonizes functionality and aesthetics, ensuring it complements any high-end audio system. Crafted to embody the signature Halcro design, its sleek appearance is enhanced by concealed fasteners and integrated heat sinks, resulting in a clean and modern look. The unit's proportions have been optimized for both freestanding setups and standard 19-inch shelving systems, making it versatile for various domestic environments.

Control and usability are central to the DM10’s design, with its magnetic incremental knobs and high-resolution display ensuring precise adjustments and clear status visibility. The intuitive remote control, machined from solid aluminum, offers a comfortable grip and straightforward operation, reflecting Halcro's commitment to user-centric innovation. Combined with its robust mechanical design and minimal internal wiring, the dm10 is built to deliver flawless performance and longevity in any high-end audio setup.

DM58 Monoblock

The Halcro DM58 monoblock power amplifier is a pinnacle of engineering, delivering unmatched performance with meticulous attention to detail. Designed for audiophiles seeking clarity and precision, the DM58 offers a power output of over 200W into 8 ohms and over 350W into 4 ohms, ensuring effortless delivery of dynamic range. Operating with distortion levels as low as <114dB at full power, it achieves extraordinary purity, with intermodulation distortion products similarly reduced to imperceptible levels. The amplifier supports both balanced and unbalanced inputs, each with an impedance of 100kΩ, and provides a voltage gain of 49V/V.

The DM58 features advanced components, including industrial-grade semiconductors, high-temperature-rated electrolytic capacitors, and multi-layer PCBs that minimize EMI and optimize voltage stability. The power supply is equipped with active power-factor correction for harmonic distortion reduction and accommodates a wide voltage range (85–270V RMS, 45–65Hz) without the need for adjustments. Comprehensive protection mechanisms safeguard the amplifier against short circuits, overcurrent, DC offset, and overheating. Its robust design includes four heavily shielded compartments for the power supply, input amplifier, power amplifier, and output filter, ensuring optimal isolation and performance.

Specification 

DM10 Preamplifier

Type: Full-function preamplifier with remote control and switch-mode power supply
Inputs: 3 unbalanced (RCAs) and 3 balanced (XLRs) in conventional voltage mode; 1 current mode (RCAs); phono input with variable capacitance and load resistance
Outputs: 2 pairs unbalanced (RCAs) bridgeable, 2 pairs balanced (XLRs) bridgeable in conventional voltage mode; 2 pairs current mode (RCAs) with 1 pair unbridged and 1 pair bridged; 1 pair tape output (RCAs); ¼" stereo headphone jack; 6-pin XLR for control data
Voltage gain: 20dB line stage; 32dB, 38dB, or 44dB phono MM; +27dB for phono MC
Input impedance: 20kΩ balanced, 10kΩ unbalanced for line; 10k-60kΩ plus 60-350pF continuously variable for phono MM; 220Ω plus 4.7nF for phono MC; 50Ω for current input mode
Output impedance: 340Ω balanced, 170Ω unbalanced; >30kΩ current mode; 10Ω headphones; 340Ω tape
Distortion: Unmeasurable below noise floor; 250 parts/billion (-132dB) at full specified output for balanced, unbalanced, and current modes
Phono equalization: RIAA ±0.5dB
Power consumption: 100W max
AC mains: 85-240V AC, 40-200Hz; 120-340V DC (rated up to 240V for IEC sockets)
Dimensions: 448mm x 240mm x 400mm
Weight: 23kg

DM58 Monoblock

Type: Solid-state monoblock power amplifier with active power-factor correction
Inputs: 1 unbalanced; 1 balanced
Output Power: >200W into 8Ω (23dBW); >350W into 4Ω (22.4dBW)
Distortion: At full power output, all harmonic distortion orders <-114dB up to 20kHz (<4000 ppb or <0.0004%)
THD: <-128dB at 1kHz (<400 ppb)
Intermodulation Products: All <-114dB relative to power output for sum of 19+20kHz tones, each delivering 87.5W into 4Ω or 50W into 8Ω or SMPTE-IM
Noise: Equivalent input noise at input: 5nV/√Hz
Slew-Rate Limit: Maximum slew rate for small-signal and maximum output voltages: 100V/µs (equivalent to a maximum output voltage at ~250kHz)
Input Impedance: 100kΩ, both inputs
Voltage Gain: 49V/V (33.8dB), both inputs
Overload Recovery: 1µs recovery from hard overload at 20kHz into 4Ω
Protection: Short-circuit-proof; overcurrent limiting; gradual power limiting if the amplifier becomes too hot; will cut out if a continuous DC offset appears on output or if output current exceeds 12A average continuously over a few minutes; protection against most input overloads
Power-Supply Protection: Cuts out if most common faults are detected (e.g., over-voltage, master clock at incorrect frequency, excessive temperatures); protected against most mains transients
Operating Voltage: 85-270V RMS, 45-65Hz, without internal or external switches
Dimensions: Height 79cm; Width 41cm; Depth 41cm
Weight: 57kg each