HELIX C FOUR
Fantastic sound quality - impressive, powerful
The C FOUR is a 4-channel amplifier of the absolute top class, the construction of which is dedicated to perfect sound down to the last detail. An ultra-low-noise and low-distortion driver stage in Class A technology controls a total of 32 hand-selected power MOSFETs, which with a damping factor of 1,000 have every loudspeaker under control. The intelligent power supply control, which keeps the supply voltage for the output transistors of the amplifier constant, also ensures stable conditions. This means that the phenomenal performance data of the C FOUR are independent of the operating voltage.
The C FOUR creates the perfect transition to the digital world with the optionally available SPDIF input module HDM 2. This receives digital audio signals up to 96 kHz sampling rate without loss via fiber optics and converts them to the analog level back. Thus the C FOUR is absolutely future-proof and perfectly equipped for the combination with our digital signal processors.
Features
Extremely broadband Class AB amplifier with eight selected MOSFET transistors per channel for exceptional sound quality - ideal for high resolution audio
Ultra-low-noise and low-distortion power amplifier drivers in Class A technology
Enormous damping factor of 1,000 @ 4 ohms for perfect loudspeaker control
Optionally available HELIX Digital Input Module (HDM) to expand the amplifier by two optical digital inputs in SPDIF format
Integrated, active crossover with high pass, low pass and band pass
Regulated DC / DC switching power supply with start-stop capability down to 6V supply voltage
Processor-controlled monitoring of the amplifier and temperature-controlled fan control
Input mode switch for flexible distribution of input signals
BurrBrown DA converter of the latest generation with 32 bit resolution in combination with the optional HDM 2 module
Solid 24 carat gold-plated power and loudspeaker connections
Coppered 70μ conductor tracks for optimal current flow
SMD technology (Surface Mounted Device) on a quadruple multilayer circuit card
Special features:
Start stopping ability
The power supply in the HELIX C FOUR amplifier ensures the internal power supply even in the event of short-term drops down to 6 volts. This ensures that the HELIX C FOUR remains fully functional even when the engine is started.
High-resolution audio
The extremely high audio bandwidth of this amplifier enables lossless audio playback of high-resolution audio signals to ensure the best possible sound in studio quality.
Technical specifications
Power RMS / Max.
- @ 4 ohms 4 x 150/300 watts
- @ 2 ohms 4 x 220/440 watts
- @ 1 ohm -
- bridged at 4 ohms 2 x 440/880 watts
- bridged at 2 ohms -
Max. Power per channel * Up to 250 watts RMS @ 2 ohms
Amplifier technology Class AB
Entrances 4 x Cinch
1 x Remote In
Optional via HDM 2 module:
2 x optical SPDIF format (28 - 96 kHz)
Input sensitivity Cinch 1 - 8 volts
Input impedance cinch 7.5 kOhm
Input impedance high level -
Outputs 4 x speaker output
Output voltage cinch -
Signal converter for the digital input -
Frequency range 10 Hz - 80,000 Hz
Bass boost -
High pass 15 Hz - 4,000 Hz adjustable
Low pass 15 Hz - 4,000 Hz adjustable
Bandpass 15 Hz - 4,000 Hz adjustable
Subsonic -
phase -
Edge steepness high / low pass 12 dB / oct.
Subsonic slope steepness / low pass -
Signal to noise ratio digital input -
Signal to noise ratio analog input 112 dB (A-weighted)
Total harmonic distortion (THD) <0.007%
Damping factor > 1000
Operating voltage 9 - 16 volts (max. 5 seconds down to 6 volts)
No-load current consumption 2400 mA
Fuse 3 x 30 A LP mini plug-in fuse
Additional features Active, adjustable crossover, HDM slot,
input mode switch, high-resolution audio, start-stop capability
Dimensions (H x W x D) 37.1 x 430 x 240 mm
* In typical multi-channel applications (2- / 3-way system + rear + subwoofer)
scope of delivery
1 x high-end amplifier HELIX C FOUR
2 x Allen keys
1 x fastening material
1 x operating instructions