Mercury MRX168A - Speaker Hifonics - Free user manual and instructions

Product Type	Amplified Subwoofer
Brand	Hifonics
Model	Mercury MRX168A
Dimensions (W x H x D)	195 x 74 x 260 mm
Weight	Not specified
Power Supply	12 V DC (9-15 V), negative ground
Fuse	20 A
RMS Output Power	100 W
Max Output Power	200 W
Frequency Response	30 – 150 Hz
Low Pass Filter (LPF)	50 – 150 Hz, adjustable
Subsonic Filter	Fixed at 30 Hz
Phase Shift	0° / 180°
Bass Boost	0 – 12 dB @ 45 Hz
Audio Inputs	RCA and high level input (HI LEVEL)
Auto Turn On	Yes, via DC offset detection (AUTO TURN ON)
Remote Bass Level Control	Yes, included
Protection	LED PROTECT (red) for overheating or short circuit
Mounting	Must be protected against shocks, vibrations, dust; audio and power cables separated
Maintenance	Regularly check connections and fuse cleanliness

Frequently Asked Questions - Mercury MRX168A Hifonics

How to install the amplifier in a 12 V negative ground vehicle?

First disconnect the negative terminal of the battery. Connect the GND terminal to the negative pole, then the +12V terminal to the battery via a fuse (20 A) placed within 30 cm of the battery. Connect the REM wire to the car radio receiver. Use cables of appropriate gauge.

What to do if the LED PROTECT lights up (red)?

The PROTECT LED indicates overheating or a short circuit. Turn off the device, check the speaker impedance (too low) and connections. Resolve the issue, the amplifier will restart automatically.

Can I use the high level input and RCA at the same time?

No, never use both simultaneously. This can seriously damage the device. Choose only one input type.

How does the AUTO TURN ON function work?

Set the AUTO TURN ON switch to ON. The amplifier detects a DC voltage (6 V) on the high level input when the source turns on, and turns on automatically. When the source turns off, it turns off. The REM connection is then not necessary.

How to correctly adjust the input level and Bass Boost?

Set the car radio volume to half, then turn the LEVEL knob to obtain a medium sound volume. Use the BOOST (0-12 dB) sparingly to avoid distortion.

What is the PHASE switch for?

The PHASE switch allows switching between 0° and 180°. It synchronizes the subwoofer with the other speakers for better acoustic integration in the vehicle.

How to adjust the low pass filter (LPF)?

Turn the LPF control between 50 and 150 Hz to adjust the cutoff frequency. The lower the value, the only low frequencies pass. Adapt it to the speaker used.

Can I control the bass level remotely?

Yes, use the provided remote control. Connect it to the BASS LEVEL CONTROLLER connector with the included cable. You can then adjust the bass from the driver's seat.

What type of cable to use for power?

Use a cable of sufficient gauge (at least 4 mm² recommended) for the +12V and GND terminals. For REM, a 0.5 mm² cable is sufficient.

What to do if the amplifier does not turn on?

Check the power connections, the fuse (20 A) and the battery voltage (9-15 V). Make sure the REM wire (or the AUTO TURN ON function) is active. The POWER LED should be green.

USER MANUAL Mercury MRX168A Hifonics

7 HI LEVEL INPUT schwarz/weils = L - weiß = L + grau/schwarz = R - grau = R +

AUTOMATISCHE EINSCHALTFUNKTION

9 LEVEL MIN MAX

Please read the user's manual carefully before the installation and the first operation of the amplifier.

SPECIFICATIONS

Subwoofer	15 x 20 cm (6" x 8")
Output Power RMS	1 x 100 W
Output Power Max	1 x 200 W
Frequency Range	30 – 150 Hz
Lowpass Filter	50 – 150 Hz
Subsonic Filter	Fixed at 30 Hz
Phase Shift	0° / 180°
Bass Boost	0 – 12 dB @ 45 Hz
Operating Voltage	+12 V (9 – 15 V), negative ground
Fuse Rating	20 A
Dimensions (B x H x L)	195 x 74 x 260 m

All Speci cations are subject to change

IMPORTANT NOTES PRIOR TO INSTALLATION

• This device is only suited for a 12 volt system with negative ground.
• Ensure that the input and output cables are sufficiently separated from the power supply cables. Otherwise, interferences may occur.
• Ensure the accessibility of the fuse and the operating elements after installation.
• The reliability and performance of the amplifier depends on the quality of installation. Preferably consult an expert to install the system.
• Avoid any damage or removing of the components of the vehicle like wires, cables, board computer, seat belts, gas tank or the like.

POWER SUPPLY AND TURN-ON-CONNECTION

ATTENTION: Before you start with the installation, disconnect the ground connection from the vehicle's battery in order to prevent short circuits. Use the enclosed cable plug to connect each terminal.

The power wiring which is usually installed in on-board car networks is not sufficient for a power amplifier's demands. Make sure that the power wires to GND and to the +12V terminal has been sufficiently specified.

First connect the GND terminal [1] of the amplifier to an appropriate ground connection at the chassis. To ensure a good connection, residue dirt and dust from the connection point. A loose connection may cause malfunctions or interferences noise and distortion.

Then connect the +12 V terminal [2] of the amplifier with the battery by using an appropriate cable including an in-line fuse. This fuse [4] should be located very close to the battery [3]; for safety reasons not more than 30 cm away. Only insert the fuse when the installation, including the connection of the loudspeakers, has been accomplished.

Then connect the remote turn-on-wire [5] from the head unit with the amplifier's REM terminal. A cable with a cross-section of 0.5 mm^2 is adequate.

+ - 3 4 5 +12V GND POWER INPUT 1 2 REM +12V GND

AUDIO SIGNAL CABLES

When installing the audio cables between the RCA outputs of the head unit and the RCA inputs of the amplifier [6], the audio and power supply cables should, if possible, not be routed along the same side of the vehicle. We recommend a separated installation, e.g. routing the power cable through the cable channel on the left side and the audio cables through the cable channel of the vehicle on the right side or vice versa. This prevents interferences due to crosstalk into the audio signal.

graph LR
    A["6"] --> B["Low Level"]
    B --> C["Curved Arrow"]

HIGH LEVEL INPUTS & AUTO TURN ON

The high level inputs under HI LEVEL INPUT [7] is suitable to connect the device input with speaker wires, if your head unit is not equipped with pre-amplifier RCA outputs. Extend therefore every regarding speaker cable from your head unit with appropriate speaker cables from your car audio retailer to the mounting location of the amplifier. Then connect the each matching loudspeaker cable with the cables of the included High Level Input jack.

CAUTION: Never use the high level inputs and the RCA inputs at the same time. This may damage the device seriously. Use the enclosed cable plug to connect each terminal.

HI LEVEL INPUT black/white = L - white = L + grey/black = R - grey = R +

AUTO TURN ON

Push the AUTO TURN ON switch [8] to ON position. The amplifier detects now a voltage rise (6 Volts) over the connected input signal on the HI LEVEL INPUT [7] when the head unit will be switched on. Hence, the amplifier will also be turned on. As soon as the head unit will be turned off, the amplifier turns also automatically off. In this case the turn-on connection [5] is not needed.

NOTE: The AUTO TURN ON function usually works with 90% of all head units, because they are equipped with "High Power"-outputs. Only with a few older and still existing head units the Auto Turn On function is not working.

8 AUTO TURN ON ON OFF

INPUT SENSITIVITY

Turn the LEVEL [9] controller of the amplifier to the MIN position. Then turn the volume controller of the head unit to 80 - 90% of its full setting. Now turn LEVEL [9] clockwise until you hear some distortion. Then turn back LEVEL [9] slightly until you hear a cleaner sound.

9 LEVEL MIN MAX

VARIABLE BASS BOOST

By using the BOOST controller [10] you are able to increase the bass enhancement from 0 to 12 dB. ATTEN- TION: Use the BASS BOOST wisely!

10 BOOST 0dB +12dB

PHASE SWITCH

The PHASE switch [11] allows to switch the phase from 0^ to 180^ to match the output signal with the vehicle's interior acoustic.

11 PHASE 180° 0°

VARIABLE LOW PASS FILTER

Set the desired crossover frequency by using the controller LPF [12]. Thus to that only the frequencies below the chosen crossover frequency will be amplified and the subwoofer plays more precisely and efficient.

12 LPF 50Hz 150Hz

With the included bass level cable remote controller [13] allows to adjust the bass level e.g. out of the driver's seat. Connect the remote controller and the BASS LEVEL CONTROLLER terminal [14] with the enclosed cable.

BASS LEVEL POWER MIN MAX RIFRONICS BASS LEVEL CONTROLLER 13 14

PROTECTION CIRCUIT

The PROTECT LED [15] lights up red, when the amplifier is overheated, or a short circuit occurs respective a too low impedance load is connected to the speaker outputs. If this events, the internal built-in protection circuit shuts down the amplifier automatically. The amplifier should work again properly after you have solved the problems.

The POWER LED [16] lights up green, if the amplifier is in operation.

15 16 PROTECT POWER

graph LR
    A["6"] --> B["Low Level"]
    B --> C["Circle"]

ENTRÉE HAUT NIVEAU

9 LEVEL MIN MAX

BASS BOOST RÉGLABLE

6 LOW LEVEL

INGRESSO ALTO LIVELLO

9 LEVEL MIN MAX

BASS BOOST REGOLABILE

CONTROLLO REMOTO DAL LIVELLO DEI BASSI

graph LR
    A["6"] --> B["Low Level"]
    B --> C[

ENTRADAS DE ALTO NIVEL

9 LEVEL MIN MAX

BASS BOOST REGULABLE

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