Toro MR2 User manual

M i c r o Ra g e A m p l i f i e r s
MR2
MRX2
MRX4
SUPER MINI COMPACT FULL RANGE & CLASS D AMPLIFIERS
Owners Manual
Please read through this manual to familiarize yourself with your new amplifier. Should your TORO
AUDIO mobile amplifie r ever require service, you will need to have the original dated receipt.

Thank you and Congratulations
Thank you for your decision to purchase a TORO AUDIO Micro Rage amplifier! Our Micro Rage amplifiers
are the r esult of extensive engineering, testing, and bullet proof construction. Their versatility enables
compatibility with optional signal and audio processors. These high quality MOSFET amplifiers may be
configured to allow maximum flexibility in designing different speaker and subwoofer options.
COMPACT MICRO AMPLIFIERS
Models MRX2,MRX4 are full range Class-D multi channel amplifiers specifically designed for
mid-range or mid-bass speakers and sound quality subwoofer systems.
Models MR2 is a Class-D mono block amplifier designed specifically for low frequencies and are
intended only to power subwoofers.
It is important that you closely follow the wiring instructions contained in this Owners Manual so
that you get the most from your TORO AUDIO Micro Rage amplifier.
T
E
O
C
R
H
O
T
Caution
High powered audio systems in a vehicle are capable of generating higher than "Live concert"
levels of sound pressure. Continued exposure to excessively high volume sound levels will cause
hearing loss or damage. Also, operation of a motor vehicle while listening to audio equipment at
high volume levels may impair your ability to hear external sounds such as horns, warning signals,
or emergency vehicles-thus creating a potential traffic hazard. In the interest of safety, TORO AUDIO
highly recommends listening at lower volume levels when driving.

TECHNICAL FEATURES
Installation of TORO AUDIO mobile amplifiers requires detailed knowledge of electronic wiring and proper
speaker impedance. We strongly recommend installation by an authorized TORO AUDIO dealer or certified
MECP installer. This Owners Manual only provides general installation and operation instructions. If you
have any reservations about your installation skills, please contact your local TORO AUDIO dealer for
assistance. IMPORTANT: This amplifier is designed for operation in vehicles with 12-Volt negative
ground electrical systems only.
NOTE: The tools listed below may be required for basic installation
Sound Quality Full Range Class-D Design (MRX2,MRX4)
High Efficiency Class-D Design for Subwoofers (MR2)
Built-In Auto Sensing Turn-On Function (Hi-Inputs)
MOSFET Power Supplies for High Power Output and Best Stability into Low Impedance Loads
Soft Delay Remote Turn On/Off Circuit Eliminates Pops and Clicks
Variable Low Pass Electronic Crossover
Self-Diagnostic Protection Circuit with LED Status Indicator for; Impedance Over-load, Speaker Short
Circuit, Thermal Overheating, and DC Output
1-OHM Stable Operation with Extensive Output Power Increase (MR2)
Variable Gain Control
Remote Level Control Port (for optional controller)
An electric drill with bits
Phillips head and standard screwdrivers
Wire strippers
Crimping tool
VOM (electronic volt ohm meter)
Heat shrink tubing and heat gun
Soldering iron
Electronic (Rosen Core not Acid Core) Solder
INSTALLATION EXPERIENCE REQUIRED

Fig.1 Mounting Amplifier
Turn off all stereo and other electrical devices before you begin
Disconnect the negative (-) lead from your vehicle’s battery
Locate all fuel lines, brake lines, oil lines, and electrical cables when planning the install
Make sure there is at least 2-inches (5 cm) around the air vents on the amplifier.
When connecting ground points, make sure all paint is carefully scrapped away from the vehicle's
chassis and contact is make with bare metal
Use a utility knife to trim away fabric from hole locations before drilling or cutting
When running power cables through sheet metal, be sure to use grommets to properly insulate the
metal edges from the wire insulation
If possible, use tubing through grommets
NOTE: Proceed only if you are a qualified installer, otherwise; see your Authorized TORO AUDIO
Dealer or MECP Certified Installer to professionally install this amplifier. Always wear protective
eyewear when using tools.
Due to the high-power output of the TORO AUDIO MICRO amplifiers, considerable heat may be produced
when the unit is in operation. For this reason, the amplifier should be mounted in a location which will allow
air to circulate freely. A clearance of at least 2-inches (5 cm) to all sides of the amplifier is necessary not
only for proper cooling, but also for gaining access to the inputs and other variable controls. Be sure that
the power and signal cable connections can enter and leave the amplifier in a straight line to avoid the risk
of kinked wires causing malfunction.

Find a clear and well-ventilated area to mount your amplifier that is unobstructed by any objects that will
cause harm or block ventilation. Despite the fact that this amplifier is compact, it still needs air to cool the
heat-sink. Do not mount under a carpet or an area with dead or stagnant air. Without proper air flow the
amplifier may overheat and go into protection where the thermal overload circuitry will shut down the
amplifier.
You may use the amplifier as a template and mark the four screw locations with a felt tip pen. Set the
amplifier aside before drilling. Use caution to make sure there are no objects behind the installation surface
that may become damaged during drilling.
The amplifier should be protected from exposure to moisture and direct sunlight. The best places to mount
your amplifier are: The floor of the trunk, under the driver's seat, or on the back of the rear seat. For
alternate installation locations, please consult your authorized TORO AUDIO Dealer.
NOTE: Do not use a drill with driver bit to mount the amplifier. Excessive force could cause the
plastic mounting feet to crack.
Upside down mounting will compromise heat dissipation through the heat-sink and
could engage the thermal protection circuit.
Try to avoid mounting the amplifier on a subwoofer enclosure, as extended exposure
to vibration may cause malfunction of the amplifier.
Don't mount the amplifier so that the wire connections are unprotected or are subject
to pinching or damage from nearby objects.
The DC power wire must be fused at the battery positive (+) terminal connection
before making or breaking power connections at the amplifier power terminals,
disconnect the DC power wire at the battery end.
The battery of the car audio system must be disconnected until the entire wiring and
installation is completed.
Do not use a power drill to tighten the power, ground, remote or speaker output
terminals on the amplifier to avoid stripping the terminal screws. It is best to hand
tighten these connections.
The use of Ring and Spade terminals (not included) provide the best electrical
connection for use with the clamp style connections on this amplifier.

MR2
MR2
FIG2 . MONO AMPLIFIER PANEL LAYOUT
DESIGNED & ENGINEERED IN U.S.A.
LEVEL
10V 0.2
LPF
2
FIG3 . 4-CH AMPLIFIER PANEL LAYOUT
MRX4
MRX4
LEVEL
10V 0.2
HPF
20 300Hz
CLIP
PWR
PRT
2/4CH
HPF/LPF
10V 0.2 20 300Hz
CLIP
1/2CH
3/4CH
X4
3
SPEAKER
1 2
4

X2
FIG4. 2-CH AMPLIFIER PANEL LAYOUT
1. SPEAKERS
CONNECT SPEAKERS/SUBWOOFERS TO THESE TERMINALS WITH USING THE SUPPLIED MOLEX CONNECTOR. BE
SURE TO CHECK WIRE FOR PROPER POLARITY. NEVER CONNECT THE SPEAKER CABLES TO CHASSIS GROUND.
2. +12 VOLT POWER
CONNECT THIS TERMINAL THROUGH A FUSE CIRCUIT BREAKER TO THE POSITIVE TERMINAL OF THE VEHICLE
BATTERY OR THE POSITIVE TERMINAL OF AN ISOLATED AUDIO SYSTEM BATTERY.
AMPLIFIER FUNCTIONS
3. AUTO SENSING TURN ON FUNCTION / REM OUT (HI-INPUTS)
WHEN USE HI-INPUT, THE AMP CAN DETECT THE DC OFFSET FROM THE HIGH-LEVEL INPUT SIGNAL TO AUTO
TURN ON/OFF. WHEN THE AMP TURNS ON, THE REM TERMINAL WILL OUTPUT +12V DC TO CONTROL THE OTHER
DEVICE TURN ON/OFF.
REM IN: WHEN USE LOW LEVEL INPUT, THE AMP REM IN SHOULD BE CONNECTED TO THE REMOTE OUT OF THE
SOURCE UNIT. THE HEAD UNIT CONTROLS THE AMP TURN ON/OFF.
MRX2
MRX2
DESIGNED & ENGINEERED IN U.S.A.
10 300Hz
LEVEL
10V 0.2
4. GND
CONNECT THIS CABLE DIRECTLY TO THE FRAME OF THE VEHICLE. MAKE SURE THE METAL FRAME HAS BEEN
STRIPPED OF ALL PAINT DOWN TO THE BARE METAL. USE THE SHORTEST DISTANCE POSSIBLE. IT IS ALWAYS A GOOD
IDEA TO REPLACE THE FACTORY GROUND AT THIS TIME WITH A LARGER CABLE AND CONNECT DIRECTLY TO THE
VEHICLES BATTERY GROUND TERMINAL OR ANY OTHER FACTORY GROUND POINTS.
5. RCA INPUT/AUTO HI-LOW LINE CONVERTOR
THESE RCA INPUT JACKS CONNECT WITH YOUR SOURCE UNITS RCA LOW LEVEL OUTPUTS OR VIA OPTIONAL
ADAPTER WITH YOUR SOURCE UNIT SPEAKER HIGH LEVEL OUTPUTS. THE USE OF HIGH QUALITY TWISTED COPPER
CAR AUDIO CABLES IS RECOMMENDED TO PREVENT THE POSSIBILITY OF DISTURBANCE TO THE AUDIO SIGNAL.

6. REMOTE (MR2)
CONNECT THE REMOTE CONTROLLER TO ADJUST THE AMPLIFIERS VOLUME FROM THE DRIVERS SEAT.
7. GAIN CONTROLLER
THE GAIN CONTROL WILL MATCH THE AMPLIFIERS SENSITIVITY TO THE SOURCE UNITS SIGNAL VOLTAGE. THE
OPERATING RANGE IS 10V TO 200MV. THIS IS NOT A VOLUME CONTROL!
8.LOW PASS FILTER CONTROL (MR2)
THIS CONTROL IS USED TO SELECT THE DESIRED LOW PASS X-OVER FREQUENCY. THE FREQUENCY CAN BE
ADJUSTED FROM 60HZ TO 220HZ FOR ALL BASS MONO MODELS.
9. BASS BOOST LEVEL KNOB (MR2)
10. X-OVER MODE (MRX2)
11. FREQUENCY CONTROL (MRX2)
THESE SWITCHES WORK WITH THE CROSSOVER. THE X1 & X10 BUTTONS ARE FOR HIGH PASS & LOW PASS
FREQUENCY ADJUSTMENTS. WHEN THIS BUTTON IS SET AT THE "X1" THE HPF/LPF RANGE IS FROM 10HZ ~ 300HZ .
WHEN THIS BUTTON IS SET AT THE "X10" POSITION, THE RANGE ADJUSTMENTS ARE 100HZ ~ 3KHZ .
CAUTION: USE HPF & LPF BUTTONS AND KNOBS CORRECTLY TO PREVENT INCORRECT FREQUENCY DAMAGE TO
CORRESPONDING DRIVERS.
12. POWER PROTECTION INDICATOR
THIS LED WILL LIGHT UP WHEN THE AMPLIFIER IS WORKING PROPERLY.
THIS RED LED WILL LIGHT UP AND WILL BE FLASHING IF THERE IS A FAULT PRESENTED TO THE AMPLIFIER.
PLEASE DISCONNECT THE AMPLIFIER AND RESOLVE THE FAULT BEFORE RECONNECTING THE AMPLIFIER
THIS LED INDICATOR IS TO SHOW SIGNAL CLIPPING IF THE INPUT SIGNAL WAVE IS BEYOND THE RANGE.
BY LOWERING THE GAIN CLIPPING WILL BE REDUCED. WHEN CLIPPING IS ELIMINATED THE LED INDICATOR WILL
TURN OFF.
13. CLIP
14. CROSSOVER (MRX4)
THIS CROSSOVER SWITCH SELECTS (LPF) LOW PASS FREQUENCIES. THE HPF POSITION IS FOR FULL RANGE.
THE CROSSOVER FREQUENCY RANGE TO SELECT THE LOW PASS FREQUENCY (LPF) IS BASED ON YOUR SPEAKERS
AND SYSTEM SETUP REQUIREMENTS
THIS CONTROL ADJUSTS THE BOOST LEVEL OF THE BASS BOOST CENTER FREQUENCY. IT CAN BE ADJUSTED
FROM 0 TO 12DB. COMBINING WITH BASS BOOST FREQUENCY, YOU CAN ACCURATELY MATCH THE AMPLIFIER
PERFORMANCE TO SUBWOOFER RESPONSE.
15. HIGH PASS FILTER (MRX4)
THE (HP) HIGH PASS FREQUENCY SWITCH FOR HIGH PASS FREQUENCY SET UP FROM 20HZ TO 300HZ
BASED ON YOUR SPEAKERS AND SYSTEM SETUP REQUIREMENTS. SWITCH TO LOW/BAND PASS FOR A VERSATILE
BANDPASS SET UP FROM 20HZ TO 3KHZ OR SIMPLY A LOW PASS SET UP FOR SUBWOOFERS WITH SUB SONIC CONTROL.
THIS ADJUSTS THE OPERATING FREQUENCY RANGE OF THE AMP. WHEN SWITCHED TO LPF OR HPF, THE
CORRESPONDING FILTER CAN ADJUST THE OPERATING FREQUENCY RANGE. WHEN USING A SUBWOOFER SWITCH
TO LPF MODE. WHEN PUSHING SMALL CALIBER FULL FREQUENCY SPEAKERS OR MIDDLE AND HIGH FREQUENCY
LOUDSPEAKERS SWITCH TO HPF MODE. WHEN USING LARGE CALIBER FULL FREQUENCY SPEAKERS SWITCH TO
FULL MODE. WHEN SWITCHED TO FULL MODE THE FILTERS WILL NOT FUNCTION.

2
TORO AUDIO Rage Mono Block amplifiers will draw large levels of current, so use the largest gauge power /
ground cable possible. Using too small of a power cable can result in unnecessary over-heating of the amplifier,
distortion at high volume levels and might even cause the thermal protection circuitry to shut-off the amplifier.
Remember, bigger wire and pure copper is better! For the best results we recommend a 100% Pure Copper
amplifier install kit available at your local TORO AUDIO dealer
Use rubber grommets when running cables through any metal or sharp plastic, to prevent accidental
shorting or shearing. Make sure the cables do not interfere with the normal operation of the vehicle
The audio signal cables (RCA Cables) should be kept far away from any potential sources of
electrical interference such as electronic vehicle management systems, relays, engine computers
wiring harnesses, fuel pumps etc.
FIG5. Power Input Connection
This amplifier is designed to work within a 9 to 16 volt DC range. Before any wires are connected, the vehicles
electrical system should be checked for correct voltage supply with the help of a voltmeter.
First, check the voltage at the battery with the ignition in the OFF position. The voltmeter should read no less than
12V. If your vehicles electrical system is not up to these specifications, we recommend having it checked by an auto
electrician before any further installation. Once the vehicle is checked, make certain the correct cable gauge is used.
We recommend using as large a gauge cable as possible, use the Power Cable Selection Chart to calculate the
correct power wire size for your application. Remember Bigger is Better!
Remote 12V Output

GND(Ground)
12V(Power)
This amplifier should be wired directly to the vehicle battery using the appropriate size cable. Start
at the vehicle battery and run the power cable through to the amplifier. Avoid running the power cable
over engine components and near heater cores. The use of an in-line fuse or circuit breaker is a
must; this will prevent the risk of a potential fire caused by a short in your power cable Connect the
fuse holder or circuit breaker as close to the battery positive (+) terminal as possible (no farther then
18" from that battery). This fuse or circuit breaker should be no greater than the sum of the fuses found
on the chassis of your amplifier (also see specifications chart). You may now connect the cable to the
battery, but remember to leave the fuse out or circuit breaker "off" until all other cable connections
are made.
When grounding your amplifier, locate a metal area close to the amplifier that is good source of
ground (preferably the floor pan). Once again, investigate the area you wish to use for electrical
wires,vacuum lines, and brake or fuel lines. Use either a wire brush or sandpaper to eliminate
unwanted paint for better contact of the ground.
Now it's time to connect the power and ground cables to the amplifier. Cut both cables to length.
Use a Phillips screwdriver to loosen the BATT+ and the GND connections on the amplifier. Insert the
ground first, and then the +12V and please make sure that you place them into the correctly marked
terminals. Then tighten the screws down securely.

REM (Remote Trigger)
FUSE REQUIREMENTS
While the panel on your TORO AUDIO amplifier incorporates one or more fuses, these do nothing
to protect the vehicle from a dangerous short circuit. It is absolutely vital that the main power lead to
the amplifier(s)in the system be fused within 18-inches(45cm) of the connection to the vehicle battery.
The value of this fuse (or circuit breaker) should be no greater than the sum of the fuses found on all
of the equipment being connected to that power wire.
This terminal must be connected to a switched +12V source. Typically, remote turn-on leads are
provided at the source unit that will turn on and off the amplifier in correspondence with the source.
If the source unit does not have a remote turn-on lead, then a switched +12V supply must be used,
like the ACC,+12V.
Run a minimum of 18-gauge wire from the amplifier location to the source of the switched +12V lead.
If possible, route this wire on the same side of the vehicle as your power cable. Connect the source
remote output to the wire. Go back to the amplifier and cut the wire to length. Loosen the screw
terminal marked REM on the amplifier

X2
11
FIG6. Low Level Input using RCA
Choose the correct length and style of RCA interconnects for your needs. Always use high quality
RCA audio cables (not supplied) for signal connections--those with multiple layers of shielding or a
twisted pair variety provides better noise rejection.
Be extra careful when routing your RCA audio interconnect cables. Car environments are notorious
for poorly insulated wires. This means that hiss, engine noise, and fan noise can easily be picked up
through RCA cables if run incorrectly.
Make sure that the cables for power and audio signal are not on the same side of the vehicle and
that they do no cross each other; this will help reduce any noise that may radiate from the power
cable and the signal cable. If an audio cable is too close to a power cable, it may pick up the
magnetic field generated by the power cable, which could lead to a loss of quality in your signal.
DESIGNED & ENGINEERED IN U.S.A.
10 300Hz
LEVEL
10V 0.2
2-4 OHM
2-4 OHM

2
2
DESIGNED & ENGINEERED IN U.S.A.
LEVEL
10V 0.2
LPF
12
FIG7. MONO AMPLIFIER WIRING (SINGLE WOOFER LOAD)
WIRING DIAGRAM
FIG8. MONO AMPLIFIER WIRING (MULTI-WOOFER LOAD)
DESIGNED & ENGINEERED IN U.S.A.
LEVEL
10V 0.2
LPF
4 OH M
4 OH M
Tw o D U A L 4 O hm S U B
*EQUIVALENT PARALLEL WOOFER LOADS CANNOT BE LESS THAN THE MINIMUM STABLE LOAD RATED IN THIS
MANUAL. THE TWO NEGATIVE AND TWO POSITIVE SPEAKER TERMINALS ARE WIRED INTERNALLY INSIDE EACH
AMPLIFIER.
ONLY ONE NEGATIVE AND ONE POSITIVE ARE NEEDED WHEN WIRING TO THE AMPLIFIER.

X2
X2
DESIGNED & ENGINEERED IN U.S.A.
10 300Hz
LEVEL
10V 0.2
FIG9. (1-CHANNEL MODE)MRX2 AMPLIFIER WIRING
FIG10 MRX2 AMPLIFIER WIRING. (2-CHANNEL MODE)
MIN I M U M I MPEDAN C E F O R
STE R E O I N STALL AT ION IS 2 - O H M
MIN I M U M I MPEDAN C E F O R
BRI D G E D I NSTAL L AT ION I S 4 - O H M
DESIGNED & ENGINEERED IN U.S.A.
10 300Hz
LEVEL
10V 0.2
2 OHM-4 OHM
2 OHM-4 OHM

X4
3
SPEAKER
1 2
4
LEVEL
10V 0.2
HPF
20 300Hz
CLIP
PWR
PRT
2/4CH
HPF/LPF
10V 0.2 20 300Hz
CLIP
1/2CH
3/4CH
FIG11. (3-CHANNEL MODE)MRX4 AMPLIFIER WIRING
2 OHM-4 OHM 2 OHM-4 OHM
4 OHM-8 OHM

X4
3
SPEAKER
1 2
4
15
LEVEL
10V 0.2
HPF
20 300Hz
CLIP
PWR
PRT
2/4CH
HPF/LPF
10V 0.2 20 300Hz
CLIP
1/2CH
3/4CH
FIG12 MRX4 AMPLIFIER WIRING. (4-CHANNEL MODE)
2 OHM-4 OHM 2 OHM-4 OHM
2 OHM-4 OHM 2 OHM-4 OHM

16
TROUBLE SHOOTING
NOTE: If the Status LED is activated and glows RED with no speakers connected to the
amplifier, and all the power connections are correct, this would indicate an internal problem
with the amplifier. Contact TORO AUDIO USA or your local dealer.

17
RAGE AMPLIFIER SPECIFICATION CHART
MODEL MRX2 MRX4 MR2
Description 2ch 4ch Mono
4 Ohm RMS Power (Watt) 2x150 4x80 1x230
2 Ohm RMS Power (Watt) 2x250 4x130 1x320
1 Ohm RMS Power (Watt) N/A N/A 1x500
4 Ohm Bridged Power (Watt) 1x500 2x260 N/A
Peak Music Power (Watt) 2x250 4x130 1x600
THD @ RMS Power <0.05% <0.05% <0.05%
Freqquency Response 10Hz-40kHz 10Hz-40kHz 10Hz-220Hz
S/N Ratio (EIA Rated) >100dB >100dB >100dB
Input Sensitivity 200mV-10V 200mV-10V 200mV-10V
Crossover Slope 12dB
LPF/HPF 20Hz-300Hz/ 200-3kHz 20Hz-300Hz 50Hz-250Hz
Bass EQ (ON/OFF) N/A N/A OFF-12DB
Fuses/ ATC Style (Optional) 30A 40A 40A
Current Drawn @ Max Power 40A 50A 50A
Dimension (1.69" H x 3.07" W)
Dimension (43mm H x 78mm W)
Power output @ 14.4VDC Input
12dB (REAR CHANNEL)
5.75"
146mm
5.75"
146mm
5.75"
146mm

18
TORO AUDIO WARRANTY POLICY
This warranty covers only the original purchaser of TORO AUDIO products. In order to receive service, the
purchaser must provide TORO AUDIO with the receipt stating the consumer name, dealer, product and
date of purchase.
Products found to be defective during the warranty period will be repaired or replaced (with a product
deemed to be equivalent) at TORO AUDIO's discretion and will not be liable for incidental or consequential
damages. TORO AUDIO will not warranty this product under the following situations:
Any implied warranties including warranties of fitness for use and merchantability are limited in duration to
the period of the express warranty set forth above. Some states do not allow limitations on the length of an
implied warranty, so this limitation may not apply. No person is authorized to TORO AUDIO any other
liability in connection with the sale of this product.
Residents of HI, AK and US territories will be charged for return shipping. All inquiries regarding service
and warranty should be sent to the above address or via email at [e-mail].
TORO AUDIO Amplifiers are to be free of defects in material and workmanship for a period of 90 days,
from the date of purchase, if purchased over the counter from an authorized TORO AUDIO retailer. The
Warranty will increase to 1 (one) year if installed by a TORO AUDIO Authorized Installer.
TORO TECH LLC.
TORO TECH LLC offers limited warranty on TORO AUDIO products under normal use on the following terms:
TORO AUDIO Amplifiers are to be free of defects in material and workmanship for a period of
one(1)year.
• Amplifiers received with apparent rust or corrosion
• Any evidence of liquid damage or exposure to excessive heat
• Attempted repairs or alterations of any nature
• Product that has not been installed according to this owner’s manual
• Products that are used beyond normal operating conditions
• Products that have blown circuitry due to misuse

MANUFACTURED BY TORO TECH LLC.
DESIGNED IN U.S.A.
WWW.TOROAUDIO.COM