Helix H 400X 4 Channel Class D Car HiFi Subwoofer Amplifier Powerful Amplifier

The best of both worlds - extremely fast MOSFET driver circuits in Class A operation combined with enormously load-stable, power-potent "afterburners" in bipolar technology. This is the recipe for success for the particularly flat amplifiers, which, thanks to their sophisticated processor control, don't get their feathers ruffled in any situation. Improved repeatedly over the years, these powerhouses with the characteristic and transparent enclosure covers have reached a sound level that is unrivalled, and not just in the value-for-money category.

Extremely stable amplifiers in an extraordinary shallow heatsink

Unique Bipolar output transistor technology for unparalleled natural and warm sound experience

Fastest drivers for lowest possible THD

Processor-controlled technology for optimized operation

Fully active crossover with highpass, lowpass and bandpass filter

"Input mode" switch for flexible input signal routing

RMI (Realmixed Input) for generating an optimised mono-summing signal from

the left and right channels

Smart protection circuits against overheating, over- and undervoltage, speaker short circuiting, low impedance and faulty connection

24 carat gold-plated solid connection terminals suitable for 25 mm² / gauge 4

Completely made in Germany by using only selected components

Output power RMS / max.

- @ 4 Ohms

4 x 70 / 140 Watts

- @ 2 Ohms

4 x 125 / 250 Watts

- @ 1 Ohm

- 

- bridged @ 4 Ohms

2 x 250 / 500 Watts

- bridged @ 2 Ohms

- 

Amplifier technology

Class AB

Inputs

4 x RCA / Cinch

1 x Remote In

Input sensitivity

RCA / Cinch 0.7 - 8 Volts

Input impedance RCA / Cinch

10 kOhms

Input impedance highlevel

- 

Outputs

4 x Speaker output

Output voltage RCA / Cinch

- 

Signal converter for digital input

- 

Frequency response

20 Hz - 20,000 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

110 dB (A-weighted)

Distortion (THD)

< 0.009 %

Damping factor

> 300

Operating voltage

9 - 17 Volts 

Idle current

2200 mA

Fuse

2 x 25 A LP-Mini-fuse (APS)

Additional features

Active, adjustable crossover, input mode switch,  Colour Protection System

Dimensions (H x W x D)

31.5 x 200 x 336 mm / 

1.24 x 7.87 x 13.23"

Delivery Contents 

1 x Amplifier HELIX H 400X2 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.