HELIX M FOUR

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If you like to rev up your front and rear speakers, the M FOUR will be exactly the right "tool" to do so. With generously 100 Watts RMS per channel into both 4 Ohms and 2 Ohms load this amp will heat up your voice coils in no time despite its super-compact dimensions. On the other hand the M FOUR stays totally cool thanks to the highly efficient Class D design topology. 3-channel or 2-channel configurations are possible as well, delivering up to 2 x 200 Watts RMS of clean and undistorted output power.

Needless to say that the M FOUR is equipped with a bunch of intelligent attributes like "start-stop capability" and our proprietary "ADEP" highlevel input so that it easily deals with all installation challenges of modern cars. Finally the extensive audio features will offer a sound quality at its best.

Features

Small footprint Class D amplifier with high output power of 100 Watts RMS @ 4 and 2 Ohms load
Start-Stop capability down to 6V supply voltage
Smart highlevel input with ADEP circuit (Advanced Diagnostics Error Protection) and Auto Turn-On function
Integrated, active crossover with highpass, lowpass and bandpass
“Input mode” switch for flexible input signal routing
SMD (Surface Mounted Device) manufacturing technology combines minimum space requirement with maximum reliability
Exclusive, extremely compact and clean design with illuminated HELIX-logo and low heat dissipation thanks to extraordinary efficiency

Special features:

Smart highlevel input

The latest generation of OE car radios incorporates sophisticated possibilities of diagnosing the connected speakers. If a common amplifier will be hooked up failure messages and loss of specific features (e.g. fader function) quite often appear - but not with the M FOUR.
The new ADEP circuit (Advanced Diagnostics Error Protection) avoids all these problems without loading the speaker outputs of the OE radio during high volumes unnecessarily.

Start-Stop capability

The switched power supply of the HELIX M FOUR assures operation even if the battery’s voltage drops down to 6 Volts during engine crank.

Technical data

Output power RMS ≤ 1% THD+N
- @ 4 Ohms	4 x 100 Watts
- @ 2 Ohms	4 x 100 Watts
- @ 1 Ohm	-
- bridged @ 4 Ohms	2 x 200 Watts
- bridged @ 2 Ohms	-
Max. output power per channel*	Up to 135 Watts RMS @ 4 / 2 Ohms
Amplifier technology	Class D
Inputs	4 x RCA / Cinch 4 x Highlevel speaker input 1 x Remote In
Input sensitivity	RCA / Cinch 0.5 - 6 Volts Highlevel 1.3 - 13 Volts
Input impedance RCA / Cinch	20 kOhms
Input impedance highlevel	9 - 33 Ohms
Outputs	4 x Speaker output
Output voltage RCA / Cinch	-
Signal converter for digital input	-
Frequency response	10 Hz - 30,000 Hz
Bass boost	-
Highpass	15 Hz - 4,000 Hz adjustable
Lowpass	40 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	98 dB (A-weighted)
Distortion (THD)	0.05 %
Damping factor	100
Operating voltage	10.5 - 16 Volts (max. 5 sec. down to 6 Volts)
Idle current	1,100 mA
Fuse	2 x 30 A Maxi-fuse (APX)
Additional features	Active, adjustable crossover, input mode switch, Start-Stop capability, highlevel input with automatic turn on function and Advanced Diagnostics Error Protection (ADEP)
Dimensions (H x W x D)	50 x 230 x 154 mm / 2.00 x 9.06 x 6.06”