HELIX M FOUR – 24V Edition
If you like to rev up your front and rear speakers, the M FOUR – 24V Edition 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 – 24V Edition 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 – 24V Edition 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 12V 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 – 24V Edition.
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 – 24V Edition assures operation even if the battery’s voltage drops down to 12 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 18 – 36 Volts (max. 5 sec. down to 12 Volts)
Idle current 550 mA
Fuse 2 x 15 A Maxi-fuse (APX)
Power rating DC 24 V ⎓ 25 A max.
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”