Helix C Four, Four Channel Amplifier Class AB Active Crossover #1 Seller

Audiophile sound quality combined with impressive output power

The C FOUR is a high-end 4-channel amplifier that has been designed down to the last detail for ultimate sound quality. Audiotec Fischer's proprietary ultra low-noise and ultra low-distortion Class A driver stage feeds a total of 32 hand-selected MOSFET power transistors, resulting in an incredible damping factor of 1,000 for relentless control of every loudspeaker. The intelligent regulation of the power supply assures stable conditions for the output stages and therefore phenomenal output power independent of the cars battery voltage.

In combination with the optionally available digital input module HDM 2, the C FOUR demonstrates the perfect transition to the digital era. The HDM 2 accepts digital audio signals up to 96 kHz sampling rate via its two optical inputs followed by cutting-edge BurrBrown D/A converters with 32 Bit resolution that transform the signals back to the analog domain. Therefore the C FOUR is absolutely future-proof and perfectly prepared for the combination with our digital signal processors.

Extremely broadband Class AB amplifier with eight selected MOSFET transistors per channel for exceptional sound quality - ideal for High-Resolution audioUltra low-noise and distortion-free power amp drivers in Class A technologyEnormous damping factor of 1,000 @ 4 Ohms for perfect speaker controlOptionally available HELIX Digital Input Module (HDM) to extend the amplifier with two optical digital inputs in SPDIF formatIntegrated, active crossover with highpass, lowpass and bandpassRegulated DC / DC switching power supply with Start-Stop capability down to 6V supply voltageMicroprocessor-based monitoring of amplifier status including temperature-dependent fan controlInput Mode switch for flexible routing of the input signalsCutting-edge BurrBrown D/A converters with 32 Bit resolution in combination with the optional HDM 2 moduleMassive 24-carat gold-plated power and speaker terminalsQuad-layer PCB with extra-solid 70μ copper traces for lowest possible losses and SMD (Surface Mounted Device) manufacturing technology Special features:Start-Stop capabilityThe switched power supply of the HELIX C FOUR assures operation even if the battery's voltage drops down to 6 Volts during engine crank.High-Resolution audioThe extremely broadband audio bandwidth of the amplifier ensures a lossless audio reproduction of High-Resolution audio content to provide the best possible sound in studio quality.

Output power RMS / max.

- @ 4 Ohms

4 x 150 / 300 Watts

- @ 2 Ohms

4 x 220 / 440 Watts

- @ 1 Ohm

- 

- bridged @ 4 Ohms

2 x 440 / 880 Watts

- bridged @ 2 Ohms

- 

Amplifier technology

Class AB

Inputs

4 x RCA / Cinch1 x Remote InOptional via HDM 2 module:2 x Optical SPDIF (28 - 96 kHz)

Input sensitivity

RCA / Cinch 1 - 8 Volts

Input impedance RCA / Cinch

7.5 kOhms

Input impedance highlevel

- 

Outputs

4 x Speaker output

Output voltage RCA / Cinch

- 

Signal converter for digital input

- 

Frequency response

10 Hz - 80,000 Hz

Bass boost

-  

Highpass

15 Hz - 4,000 Hz adjustable

Lowpass

15 Hz - 4,000 Hz adjustable

Bandpass

15 Hz - 4,000 Hz adjustable

Subsonic

- 

Phase

- 

Slope high- / lowpass

12 dB/Oct.

Slope subsonic / lowpass

- 

Signal-to-noise ratio digital input

- 

Signal-to-noise ratio analog input

112 dB (A-weighted)

Distortion (THD)

< 0.007 %

Damping factor

> 1000

Operating voltage

9 - 16 Volts  (max. 5 sec. down to 6 Volts)

Idle current

2400 mA

Fuse

3 x 30 A LP-Mini-fuse (APS)

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 / 1.46 x 16.93 x 9.45"

Delivery contents

1 x High-end amplifier HELIX C FOUR2 x Allen key1 x Mounting material1 x Instruction manual

We take great care packaging every item to ensure safe shipment to you. Our postage and courier charges not only cover the shipping cost, but also the time to pack your order, plus packaging supplies etc. PPlease note - some items may incur extra shipping charges that have to be sent by courier and are too large / expensive to be sent by Royal Mail (for example headlamps, headunits, speakers, lowering springs etc) to the following postcode areas, Channel Islands, BT, most IV, HS, KA-27-28, Any KW, AB30-56, FK17-99, G83, KW1-14, PA21-40, PH18-26, PH30-41, PH49-50, all ZE, IM, and any other non mainland postcodes.