HELIX M ONE X 24V 1-Channel Subwoofer Amplifier With Integrated Active Crossover User Manual

HELIX M ONE X 24V 1-Channel Subwoofer Amplifier With Integrated Active

Crossover

Specifications

• 1 Ohm stability
• Active crossover
• Power Output:
  • 1 x 4 Ohm: 400 Watts
  • 1 x 2 Ohm: 700 Watts
  • 1 x 1 Ohm: 1,030 Watts

FAQ

Q: What is the minimum load impedance for the Speaker Output?

• A: The minimum load impedance for the Speaker Output should not go below 1 Ohm.

Q: How do I adjust the Bass Boost Gain?

• A: Use Regler 7 to adjust the Bass Boost Gain from 0 to 12 dB.

Q: What is the purpose of the TwinPower Link-Schalter?

• A: The TwinPower Link-Schalter allows for linking two M ONE X – 24V Edition units together.

Congratulations!

• Dear Customer,
• Congratulations on your purchase of this innovative and high-quality HELIX product.
• The HELIX M ONE X highlights the best quality, excellent manufacturing, and state-of-the-art technology.
• Thanks to more than 30 years of experience in research and development of audio products this amplifier generation sets new standards.
• We wish you many hours of enjoyment with your new HELIX amplifier.
• Yours, AUDIOTEC FISCHER Team

General instructions

• General installation instructions for HELIX components
• To prevent damage to the unit and possible injury, read this manual carefully and follow all installation instructions. This product has been checked for proper function before shipping and is guaranteed against manufacturing defects.
• Before starting your installation, disconnect the battery’s negative terminal to prevent damage to the unit, fire, and/or risk of injury.
• For proper performance and to ensure full warranty coverage, we strongly recommend getting this product installed by an authorized HELIX dealer.
• Install your M ONE X in a dry location with sufficient air circulation for proper cooling of the equipment.
• The amplifier should be secured to a solid mounting surface using proper mounting hardware. Before mounting, carefully examine the area around and behind the proposed installation location to ensure that there are no electrical cables or components, hydraulic brake lines, or any part of the fuel tank located behind the mounting surface. Failure to do so may result in unpredictable damage to these components and possibly costly repairs to the vehicle.

General instruction for connecting the HELIXM ONE X – 24V Edition amplifier

• The HELIX M ONE X – 24V Edition amplifier may only be installed in vehicles that have a 24 Volts negative terminal connected to the chassis ground.
• Any other system could cause damage to the amplifier and the electrical system of the vehicle.
• The positive cable from the battery for the complete system should be provided with a main fuse at a distance of max. 30 cm from the battery. The value of the fuse is calculated from the maximum total current input of the car audio system.
• Use only suitable cables with sufficient cable cross-section for the connection of the HELIX M ONE X – 24V Edition. The fuses may only be replaced by identically rated fuses (3 x 20 A) to avoid damage to the amplifier.
• Before installation, plan the wire routing to avoid any possible damage to the wire harness. All cabling should be protected against possible crushing or pinching hazards.
• Also avoid routing cables close to potential noise sources such as electric motors, high-power accessories, and other vehicle harnesses.

Connectors and control units

1. Line Input
   • RCA inputs for connecting low-level line signals.
2. High-level Input
   • High-level speaker inputs for connecting a factory radio or an aftermarket radio without low-level line outputs.
3. Gain
   • Control for adjusting the input sensitivity of the low-level Line and high-level inputs.
4. Phase
   • Control for adjusting the phase from 0° to 180°.
5. TwinPower Link switch
   • Switch for operating two M ONE X – 24V Edition amplifiers in bridge mode.
6. Mono RCA/Cinch In- / Output
   • Mono RCA/Cinch signal in- or output for bridge mode operation in TwinPower Link mode.
7. Bass Boost Gain
   • Control for adjusting the bass boost from 0 to 12 dB.
8. Bass Boost Q-Factor
   • Control for adjusting the Q factor (bandwidth) of the Bass Boost
9. Bass Boost Frequency
   • Control for adjusting the center frequency of the Bass Boost from 30 to 80 Hz.
10. Subsonic
    • Control for adjusting the subsonic filter from 10 to 50 Hz.
11. Lowpass
    • Control for adjusting the lowpass filter from 50 to 250 Hz.
12. Remote
    • Input for connecting the included cable remote control for volume adjustment.
13. Speaker Output
    • Speaker outputs for connecting subwoofers.
14. Power & Protect LED
    • This LED indicates the operating mode of the amplifier.
15. Fuse
    • Input fuses – 3 x 20 Ampere.
16. +24 V
    • Connector for the +24 V power cable of the positive terminal of the battery.
17. REM
    • Connector for the remote cable.
18. GND
    • Connector for the ground cable (negative terminal of the battery or metal body of the vehicle).

Initial start-up and functions

1. Line Input

   • 2-channel low-level line input to connect signal sources such as head units/radios / DSPs. Important: It is strictly forbidden to use the High-level Input and low-level Line Input at the same time.
   • This may cause severe damage to the low-level line outputs of your head unit/car radio.

2. High-level Input

   • 2-channel high-level loudspeaker input to connect the amplifier directly to the loudspeaker outputs of OEM / aftermarket radios that do not have any low-level line outputs.
   • The Highlevel Input is equipped with our proprietary ADEP circuit (Advanced Diagnostics Error Protection) which ensures that the car radio detects the amplifier as a speaker and thus neither any function of the radio (e.g. fader) will be deactivated nor any error log in the CPU of the car will be created. If this input is used the remote input (REM) does not need to be connected as the amplifier will automatically turn on once a loudspeaker signal is applied. Attention: Solely use the pluggable screw-terminal for the highlevel connector which is included in delivery!
   • Important: It is strictly forbidden to use the High-level Input and low-level Line Input at the same time. This may cause severe damage to the low-level line outputs of your car radio.

3. Gain

   • This control is used to adapt the input sensitivity to the output voltage of the connected signal source.
   • This is not a volume control, it´s only for adjusting the amplifier gain. The control range of the RCA / Line Input (low level) is 0.5 – 6 Volts and 1.1 – 13 Volts for the Highlevel Input.
   • If the Highlevel Input is used in combination with a standard car radio we recommend an input sensitivity of roughly 9 Volts. For this purpose, turn the control from max. CCW position to 9 o’clock position.

4. Phase Shift

   • This control is used to adjust the phase from 0° to 180°. This allows to match the phase of the sub-woofer with the other speakers thus avoiding any cancellations in the frequency response due to phase shifts.

5. TwinPower Link switch

   • The HELIX M ONE X – 24V Edition amplifier can be connected to a second M ONE X – 24V Edition via the TwinPower Link by which the output power is more than doubled, depending on the speaker configuration.
   • To operate two amplifiers in this mode, they must be connected with a RCA / Cinch cable (see item 6; Mono RCA/Cinch In- / Output).
   • The amplifier which is set as “Master” assumes complete control (active crossover, bass boost, etc.) for both amps. All filter adjustments of the amplifier which operates in “Slave” mode will be deactivated.
   • Attention: Make sure that one amplifier is adjusted as “Master” and the other one as “Slave”. In this mode, the minimum speaker impedance is 2 Ohms.
   • Note: If the amplifier operates individually the TwinPower Link switch must be set to “Master”. Examples of speaker configurations in TwinPower
   • Link mode can be found on.

6. Mono RCA/Cinch In- / Output

   • This connector serves as signal in- or -output for connecting a further M ONE X – 24V Edition amplifiers in bridge mode (see item 5; TwinPower Link switch).

7. Bass Boost Gain

   • This control is used to increase the adjusted bass center frequency (see item 9) from 0 to 12 dB.
   • Initial start-up and functions

8. Q-Factor

   • This control is used to adjust the Q factor (bandwidth) of the Bass Boost. When set to “NAR” only a narrow range around the center frequency (defined by control 9) will be affected whereas when set to “WIDE” the Bass Boost has a broadband effect
     around the chosen center frequency. The Q factor remains constant if the center frequency (control 9) is changed.

9. Bass Boost Frequency

   • This control is used to adjust the center frequency of the Bass Boost from 30 Hz to 80 Hz. The adjusted bass frequency can be enhanced from 0 to 12 dB with control 7.
   • This is useful to emphasize or correct a determined frequency of the subwoofer (kickbass).

10. Subsonic

    • This control is used to adjust the crossover frequency of the subsonic filter from 10 Hz to 50 Hz. The subsonic filter cuts off very low frequencies which aren’t audible and therefore relieves the amplifier and also the subwoofer.
    • Additionally, the amplifier will have more power available for the audible frequencies. This control is always activated and its adjustment is mandatory.

11. Lowpass

    • This control is used to adjust the crossover frequency of the lowpass filter from 50 Hz to 250 Hz. This control is always activated and its adjustment is mandatory.
    • In combination with the subsonic filter, the lowpass filter creates a bandpass in any case. By adjusting the subsonic (control 10) and lowpass filter (control 11) any bandpass between 10 Hz and 250 Hz can be realized.
    • Caution: To avoid a loss of gain make sure that the crossover frequencies of the subsonic and lowpass filters do have an interval of at least two octaves when generating a bandpass.
    • That means if the lowpass is adjusted to 100 Hz the subsonic should be adjusted to 25 Hz or less (one octave = doubled frequency or halved frequency).

12. Remote

    • This input is used to connect the included cable remote control. The remote control allows you to control the volume of the connected subwoofer.

13. Speaker Output

    • Speaker outputs to connect a subwoofer. The minimum load impedance must not be lower than 1 Ohm.

14. Power & Protect LED

    • The power and protect LED indicates the operating mode of the amplifier.
    • Green Red: The amplifier is ready for operation.
    • A malfunction has occurred. A malfunction may have different causes as the HELIX M ONE X – 24V Edition is equipped with several protection circuits.
    • These protections shut off the amplifier in case of overheating, over-, and undervoltage, short-circuit on loudspeakers, and false connection.
    • Please check for connecting failures such as short circuits, wrong connections, wrong adjustments, and over-temperature.
    • If the amplifier does not turn on it is defective and has to be sent to your local authorized dealer for repair service. A detailed description of the malfunction and the purchase receipt has to be attached.

15. Fuse

    • The input fuses are connected in parallel and protect an internal fault of the device, therefore the system must be additionally protected by a further main fuse located close to the battery (max. distance from the battery: 30 cm / 12”).
    • The HELIX M ONE X – 24V Edition is equipped with 3 x 20 Ampere fuses.

16. +24 V

    • Connect the +24 V power cable to the positive terminal of the battery. Recommended cross section: min. 10 mm² / AWG 8.

17. REM

    • The remote lead should be connected to the remote output / automatic antenna (aerial positive) output of the head unit/car radio.
    • This is only activated if the head unit is switched on. Thus the amplifier is switched on and off together with the head unit car radio. This input needn’t be assigned if the Highlevel Input is used.

18. GND

    • The ground cable should be connected to a common ground reference point (this is located where the negative terminal of the battery is grounded to the metal body of the vehicle) or to a prepared metal location on the vehicle chassis i.e. an area that has been cleaned of all paint residues. Recommended cross section: min. 10 mm² / AWG 8.

Installation

Connection of HELIX M ONE X – 24V Edition to the head unit/car radio:

• Caution: Carrying out the following steps will require special tools and technical knowledge.
• To avoid connection mistakes and/or damage, ask your dealer for assistance if you have any questions, and follow all instructions in this manual.
• It is recommended that this unit be installed by an authorized HELIX dealer.

1. Connecting the low-level line inputs
   • Use the correct cable (RCA / Cinch cable) to connect these inputs to the low-level line outputs of your car radio. It is mandatory to use both low-level line inputs.
   • The automatic turn-on circuit does not work when using the low-level line inputs. In this case, the remote input (REM) has to be connected to activate the HELIX M ONE X.
   • Important: It is strictly forbidden to use the high-level input and low-level Line Input at the same time. This may cause severe damage to the low-level line outputs of your car radio.
2. Connecting the highlevel speaker inputs
   • The highlevel loudspeaker inputs can be con-nected directly to the loudspeaker outputs of an OEM or aftermarket radio using appropriate cables (loudspeaker cables with 1 mm² / AWG 18 max.).
   • It is mandatory to use both highlevel speaker inputs. Make sure that the polarity is correct. If one connection has reversed polarity it may affect the performance of the amplifier.
   • If this input is used the remote input (REM) does not need to be connected as the amplifier will automatically turn on once a loudspeaker signal is applied.
3. Adjustment of the input sensitivity
   • Attention: It is mandatory to properly adapt the input sensitivity of the M ONE X – 24V Edition to the signal source to avoid damage to the amplifier.
   • If you want to change the input sensitivity use the Gain control (see page 15, item 3). The setting of the control affects both the low-level line inputs (Line Input) and the highlevel speaker inputs (High-level Input)!
   • If the High-level Input is used in combination with a standard car radio we recommend an input sensitivity of roughly 9 Volts. For this pur-pose, turn the control from max. CCW position to 9 o’clock position.
4. Connection to power supply
   • Make sure to disconnect the battery before installing the HELIX M ONE X – 24V Edition! Connect the +24 V power cable to the positive terminal of the battery. The positive wire from the battery to the amplifier power terminals needs to have an inline fuse at a distance of less than 12 inches (30 cm) from the battery. The value of the fuse is calculated from the maximum total current draw of the whole car audio system (M ONE X – 24V Edition = max. 60 A RMS at 24 V power supply). If your power wires are short (less than 1 m / 40”) then a wire gauge of 10 mm² / AWG 8 will be sufficient. In all other cases, we strongly recommend gauges of 16 – 25 mm² / AWG 6 – 4!
   • The ground cable (same gauge as the +24 V wire) should be connected to a common ground reference point (this is located where the negative terminal of the battery is grounded to the metal body of the vehicle), or to a prepared met-al location on the vehicle chassis, i.e. an area which has been cleaned of all paint residues.
5. Connecting the remote input
   • The remote input (REM) has to be connected to the radio remote output if the amplifier’s low-level line inputs are used as signal inputs. We do not recommend controlling the remote input via the ignition switch to avoid pop noise during turn on/off.
   • If the Highlevel Input is used this input does not need to be connected as long as the car radio has BTL output stages.
6. Connecting the loudspeaker outputs
   • The loudspeaker outputs can be connected directly to the wires of the loudspeakers. Never connect any of the loudspeaker cables to the chassis ground as this will damage your amplifier and your speakers.
   • If The positive terminal is indicated on most speakers. The minimum load impedance must not be lower than 1 Ohm, (2 Ohm in TwinPow-er Link operation) otherwise the amplifier protection will be activated.
   • Examples of speaker configurations can be found on et sqq.

Unique Features of the HELIX M ONE X – 24V Edition

Smart highlevel input

• The latest generation of OE car radios incorporates sophisticated possibilities for 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 ONE X.
• 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 ONE X – 24V Edition assures operation even if the battery’s voltage drops down to 12 Volts during engine crank.

Examples of speaker configurations

• Mono Subwoofer with one voice coil (single voice coil)

RMS output power ≤ 1% THD+N:

• 1 x 4 Ohms: 400 Watt
• 1 x 2 Ohms: 700 Watt
• 1 x 1 Ohm: 1,030 Watts

Parallel operation

• Two subwoofers with one voice coil (single voice coil) or one subwoofer with dual voice coil are connected in parallel.
• Note: The parallel connection of two voice coils will result in halving the impedance!

RMS output power ≤ 1% THD+N:

• Two subwoofers with 1 x 4 Ohms correspond to a total impedance of 2 Ohms: 1 x 700 Watt
• One subwoofer with 2 x 4 Ohms also corresponds to a total impedance of 2 Ohms: 1 x 700 Watt
• Two subwoofers with 1 x 2 Ohms correspond to a total impedance of 1 Ohm: 1 x 1,030 Watt
• One subwoofer with 2 x 2 Ohms also corresponds to a total impedance of 1 Ohm: 1 x 1,030 Watt
• Note: The parallel connection of 1 Ohm voice coils will result in the shutdown of the amplifier.

In series

• Two subwoofers with one voice coil (single voice coil) or one subwoofer with dual voice coil are connected in series.
• Note: The connection of two voice coils in series will re-sult in doubling the impedance!

RMS output power ≤ 1% THD+N:

• Two subwoofers with 1 x 2 Ohms correspond to a total impedance of 4 Ohms: 1 x 400 Watt
• One subwoofer with 2 x 2 Ohms also corresponds to a total impedance of 4 Ohms: 1 x 400 Watt
• Two subwoofers with 1 x 1 Ohm correspond to a total impedance of 2 Ohms: 1 x 700 Watt
• One subwoofer with 2 x 1 Ohm also corresponds to a total impedance of 2 Ohms: 1 x 700 Watt
• Note: The negative terminal of the first voice coil has to be connected to the positive terminal of the second voice coil by using a speaker wire with the same gauge as the other speaker.

Example configurations for TwinPower Link operation

Amplifier connection in TwinPower Link operation

Speaker connection in TwinPower Link operation

• One subwoofer with one voice coil (single voice coil)

RMS output power ≤ 1% THD+N:

• 1 x 4 Ohms: 1,400 Watts
• 1 x 2 Ohms: 2,060 Watts
• Note: The negative terminals of both amplifiers have to be connected by using a speaker wire.
• The size should be similar to the speaker wires which are used for the subwoofer connection.
• One subwoofer with dual voice coil in mono operation (dual voice coil)

RMS output power ≤ 1% THD+N:

• 2 x 4 Ohms: 800 Watts
• 2 x 2 Ohms: 1,400 Watts
• 2 x 1 Ohm: 2,060 Watts
• Note: The negative terminals of both amplifiers have to be connected by using a speaker wire.
• The negative terminal of the first voice coil has to be con-nected to the positive terminal of the second voice coil.
• The gauge of the wires should be similar to the speaker wires which are used for the subwoofer connection.

Technical Data

• RMS-Output power ≤ 1% THD+N Normal operation TwinPower Link
  • (One Amplifier) (Two amplifiers)
• @ 4 Ohm ……………………………………………………1 x 400 W atts 1 x 1,400 W atts
• @ 2 Ohm .. ………………………………………………….1 x 700 W atts 1 x 2,060 W atts
• @ 1 Ohm ……………………………………………………1 x 1 ,030 Watts –
• *Max. output power per channel: .** …………………….Up to 1,180 Watts RMS @ 1 Ohm
• Amplifier technology . ……………………………………..Class D
• Inputs ………………………………………………………….. 2 x RCA / Cinch
  • 2 x Highlevel speaker input
  • 1 x Remote In
  • 1 x Remote control input
• Input sensitivity …………………………………………….. RCA / Cinch 0.5 – 6 Volts Highlevel 1.1 – 13 Volts
• Input impedance RCA / Cinch …………………………20 kOhms
• Input impedance high level.. …………………………….9 – 33 Ohms
• Outputs ….. ……………………………………………………1 x Speaker output
• Frequency response ….. ………………………………….10 Hz – 250 Hz
• Bass boost .. ………………………………………………….0 – 12 dB / 30 – 80 Hz
• Lowpass … ……………………………………………………50 Hz – 250 Hz adjustable
• Bandpass ……………………………………………………..10 Hz – 250 Hz adjustable
• Subsonic … ……………………………………………………10 Hz – 50 Hz adjustable
• Phase . …………………………………………………………0 – 180° adjustable
• Slope subsonic / lowpass … …………………………….12 / 24 dB/Oct.
• Signal-to-noise ratio analog input …………………….95 dB (A-weighted)
• Distortion (THD) . ……………………………………………0.20 %
• Damping factor ……………………………………………..150
• Operating voltage . …………………………………………18 – 36 Volts (max. 5 sec. down to 12 Volts)
• Idle current ……………………………………………………400 mA
• Fuse …………………………………………………………….3 x 20 A Maxi-fuse (APX)
• Power rating …………………………………………………DC 24 V 53 A max.
• Additional features ………………………………………… Active, adjustable crossover, bass boost, phase shift,
• Start-stop capability, highlevel input with automatic turn-on function and Advanced Diagnostics Error Protection (ADEP), bass volume cable remote control
• Dimensions (H x W x D) …………………………………50 x 320 x 154 mm / 2.00 x 12,60 x 6.06”
• In typical applications such as subwoofer amplifier

Warranty Disclaimer

• The limited warranty complies with legal regulations.
• Failures or damages caused by overload or improper use are not covered by the warranty.
• Please return the defective product only with valid proof of purchase and a detailed malfunction description.
• Technical specifications are subject to change!
• Errors are reserved! For damages on the vehicle and the device, caused by handling errors of the device, we can’t assume liability.
• These devices are certified for use in vehicles within the European Community (EC).
• Audiotec Fischer GmbH
• Hünegräben 26 · 57392 Schmallenberg · Germany
• Tel.: +49 2972 9788 0 · Fax: +49 2972 9788 88
• E-mail:helix@audiotec-fischer.com
• Internet:www.audiotec-fischer.com

References

• High-End Car Hifi & Audio - Made in Germany | Audiotec Fischer

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