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Rockford R750-1D/ R1200-1D Fosgate Amplifier Manual

Rockford R750-1D/ R1200-1D Fosgate Amplifier Manual Image
Rockford R750-1D/ R1200-1D Fosgate Prime Mono 
Amplifier Installation and Operation Manual


Dear Customer,

Congratulations on your purchase of the world’s finest brand of car audio amplifiers. At Rockford Fosgate we are fanatics about musical reproduction at its best, and we are pleased you chose our product. Through years of engineering expertise, hand craftsmanship and critical testing procedures, we have created a wide range of products that reproduce music with all the clarity and richness you deserve.

For maximum performance we recommend you have your new Rockford Fosgate product installed by an Authorized Rockford Fosgate Dealer, as we provide specialized training through Rockford Technical Training Institute (RTTI). Please read your warranty and retain your receipt and original carton for possible future use.

Great product and competent installations are only a piece of the puzzle when it comes to your system. Make sure that your installer is using 100% authentic installation accessories from Rockford Fosgate in your installation. Rockford Fosgate has everything from RCA cables and speaker wire to power wire and battery connectors. Insist on it! After all, your new system deserves nothing but the best.

To add the finishing touch to your new Rockford Fosgate image order your Rockford accessories, which include everything from T-shirts to jackets.

To get a free brochure on Rockford Fosgate products and Rockford accessories,
visit our web site at: www.rockfordfosgate.com
or, in the U.S. call 1-800-669-9899 or FAX 1-800-398-3985.
For all other countries, call +001-480-967-3565 or FAX +001-480-966-3983.

Continuous exposure to sound pressure levels over 100dB may cause permanent hearing loss. High powered auto sound systems may produce sound pressure levels well over 130dB. Use common sense and practice safe sound.

If, after reading your manual, you still have questions regarding this product, we recommend that you see your Rockford Fosgate dealer. If you need further assistance, you can call us direct at 1-800-669-9899. Be sure to have your serial number, model number and date of purchase available when you call.

The serial number can be found on the outside of the box. Please record it in the space provided below as your permanent record. This will serve as verification of your factory warranty and may become useful in recovering your unit if it is ever stolen.

Serial Number: ______________________________________
Model Number: _____________________________________

NOTE: Review each section for more detailed information.

© 2011 Rockford Corporation. All rights reserved.
Rockford Fosgate, the Rockford Fosgate logo, and the PRIME logo are either registered trademarks or trademarks of Rockford Corporation.


Welcome to Rockford Fosgate! This manual is designed to provide information for the owner, salesperson and installer. For those of you who want quick information on how to install this product, please turn to the Installation Section of this manual. Other information can be located by using the Table of Contents. We, at Rockford Fosgate, have worked very hard to make sure all the information in this manual is current. But, as we are constantly finding new ways to improve our product, this information is subject to change without notice.


This symbol with “WARNING” is intended to alert the user to the presence of important instructions. Failure to heed the instructions will result in severe injury or death.

This symbol with “CAUTION” is intended to alert the user to the presence of important instructions. Failure to heed the instructions can result in injury or unit damage.


To prevent injury and damage to the unit, please read and follow the instructions in this manual. We want you to enjoy this system, not get a headache.


If you feel unsure about installing this system yourself, have it installed by a qualified Rockford Fosgate technician.


Before installation, disconnect the battery negative (-) terminal to prevent damage to the unit, fire and/or possible injury.


A Prime R750-1D or R1200-1D Mono Amplifier
Installation & Operation Manual
Remote Punch Level Control
Mounting Hardware Kit

The hardware kit included with each amplifier contains the mounting hardware necessary to secure the amplifier to the vehicle.

Visit our web site for the latest information on all Rockford products.


  1. Power/Protect LED – Power LED illuminates blue when the unit is turned on. Protect LED illuminates red if a short circuit or to low of an impedance is detected at the speaker connections. The amplifier will automatically shut down if this occurs.
  2. RCA Input Jacks –The industry standard RCA jacks provide an easy connection for signal level input. They are nickel-plated to resist the signal degradation caused by corrosion.
  3. RCA Pass-Thru Jacks –This Pass-Thru provides a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the rear amplifier location.
  4. Gain Control –The input gain control is preset to match the output of most source units.
  5. Infrasonic Filter – A variable 15-40Hz 12dB/octave filter designed to prevent frequencies below the audio range from being applied to the subwoofer from the amplifier. Consequently improving subwoofer performance and power handling, particularly in vented enclosures..
  6. Variable Crossover (Low Pass Only) – Is a built-in 12dB/octave Butterworth filter with a crossover point variable from 50Hz to 250Hz.
  7. Punch EQ –This control is a narrow band adjustment variable from 0dB to +18dB @ 45Hz with a Gyrator based Punch EQ that eliminates frequency shift with boost..
  8. Remote Punch Level Control –When connected, the “Gain Control” is linked and allows you to remotely control the output level of the amplifier from the dash or center console.
  9. Speaker Terminals –The heavy duty, nickel-plated set screw wire connectors ( + and -) will accommodate 8AWG. Two Positive (+) and Negative (–) terminals are provided for installation flexibility. Both terminals are wired in parallel internally. Only one Positive (+) and one Negative (–) terminal is required for a speaker connection.
  10. Power Terminals –The power and ground are nickel-plated set screw wire connectors and will accommodate 4AWG.
  11. REM Terminal –The nickel-plated set screw wire connector and will accommodate 12AWG.This terminal is used to remotely turn-on and turn-off the amplifier when +12V DC is applied.


The following is a list of tools needed for installation:
Fuse-holder and fuse.
(See specifications for fuse rating)
Volt/Ohm Meter
Wire strippers
Wire crimpers
Wire cutters
#2 Phillips screwdriver
Battery post wrench
Hand held drill w/assorted bits
Assorted connectors
Adequate Length—Red Power Wire
Adequate Length—Remote Turn-on Wire
Adequate Length—Black Grounding Wire

This section focuses on some of the vehicle considerations for installing your new amplifier. Pre-planning your system layout and best wiring routes will save installation time. When deciding on the layout of your new system, be sure that each component will be easily accessible for making adjustments.


If you feel unsure about installing this system yourself, have it installed by a qualified technician.


Before installation, disconnect the battery negative (-) terminal to prevent damage to the unit, fire and/or possible injury.

Before beginning any installation, follow these simple rules:

  1. Be sure to carefully read and understand the instructions before attempting to install the unit.
  2. For safety, disconnect the negative lead from the battery prior to beginning the installation.
  3. For easier assembly, we suggest you run all wires prior to mounting your unit in place.
  4. Route all of the RCA cables close together and away from any high current wires.
  5. Use high quality connectors for a reliable installation and to minimize signal or power loss.
  6. Think before you drill! Be careful not to cut or drill into gas tanks, fuel lines, brake or hydraulic lines, vacuum lines or electrical wiring when working on any vehicle.
  7. Never run wires underneath the vehicle. Running the wires inside the vehicle provides the best protection.
  8. Avoid running wires over or through sharp edges. Use rubber or plastic grommets to protect any wires routed through metal, especially the firewall.
  9. ALWAYS protect the battery and electrical system from damage with proper fusing. Install the appropriate fuse holder and fuse on the +12V power wire within 18″ (45.7 cm) of the battery terminal.
  10. When grounding to the chassis of the vehicle, scrape all paint from the metal to ensure a good, clean ground connection. Grounding connections should be as short as possible and always be connected to metal that is welded to the main body, or chassis, of the vehicle. Seatbelt bolts should never be used for connecting to ground.


Engine Compartment
Never mount this unit in the engine compartment. Mounting the unit in the engine compartment will void your warranty.

Trunk Mounting
Mounting the amplifier vertically or inverted will provide adequate cooling of the amplifier.
Mounting the amplifier on the floor of the trunk will provide the best cooling of the amplifier.


Passenger Compartment Mounting

Mounting the amplifier in the passenger compartment will work as long as you provide a sufficient amount of air for the amplifier to cool itself. If you are going to mount the amplifier under the seat of the vehicle, you must have at least 1″ (2.54cm) of air gap around the amplifier’s heatsink.

Mounting the amplifier with less than 1″ (2.54cm) of air gap around the amplifier’s heatsink in the passenger compartment will not provide proper cooling and will severely affect the performance of the amplifier and is strongly not recommended.


Amplifiers will put an increased load on the vehicle’s battery and charging system. We recommend checking your alternator and battery condition to ensure that the electrical system has enough capacity to handle the increased load of your stereo system. Stock electrical systems which are in good condition should be able to handle the extra load of any Prime Series amplifier without problems, although battery and alternator life can be reduced slightly. To maximize the performance of your amplifier, we suggest the use of a heavy duty battery and an energy storage capacitor.



If you do not feel comfortable with wiring your new unit, please see your local Authorized Rockford Fosgate Dealer for installation.


Before installation, disconnect the battery negative (-) terminal to prevent damage to the unit, fire and/or possible injury.


Avoid running power wires near the low level input cables, antenna, power leads, sensitive equipment or harnesses. The power wires carry substantial current and could induce noise into the audio system.

  1. Plan the wire routing. Keep RCA cables close together but isolated from the amplifier’s power cables and any high power auto accessories, especially electric motors. This is done to prevent coupling the noise from radiated electrical fields into the audio signal. When feeding the wires through the firewall or any metal barrier, protect them with plastic or rubber grommets to prevent short circuits. Leave the wires long at this point to adjust for a precise fit at a later time.
  2. Prepare the RED wire (power cable) for attachment to the amplifier by stripping 3/4″ of insulation from the end of the wire. Insert the bared wire into the B+ terminal and tighten the set screw to secure the cable in place.
    NOTE: The B+ cable MUST be fused 18″ or less from the vehicle’s battery. Install the fuseholder under the hood and ensure connections are water tight.
  3. Trim the RED wire (power cable) within 18″ of the battery and splice in a inline fuse holder (not supplied). See Specifications for the rating of the fuse to be used. DO NOT install the fuse at this time.
  4. Strip 1/2″ from the battery end of the power cable and crimp an appropriate size ring terminal to the cable. Use the ring terminal to connect to the battery positive terminal.
  5. Prepare the BLACK wire (Ground cable) for attachment to the amplifier by stripping 3/4″ of insulation from the end of the wire. Insert the bare wire into the GROUND terminal and tighten the set screw to secure the cable in place. Prepare the chassis ground by scraping any paint from the metal surface and thoroughly clean the area of all dirt and grease. Strip the other end of the wire and attach a ring connector. Fasten the cable to the chassis using a non-anodized screw and a star washer.
    NOTE: Keep the length of the BLACK wire (Ground) as short as possible. Always less than 30″(76.2cm).
  6. Prepare the Remote turn-on wire for for attachment to the amplifier by stripping 1/2″ of insulation from the end of the wire. Insert the bared wire into the REMOTE terminal and tighten the set screw to secure the wire in place. Connect the other end of the Remote wire to a switched 12 volt positive source. The switched voltage is usually taken from the source unit’s remote amp on lead. If the source unit does not have this output available, the recommended solution is to wire a mechanical switch in line with a 12 volt source to activate the amplifier.
  7. Securely mount the amplifier to the vehicle or amp rack. Be careful not to mount the amplifier on cardboard or plastic panels. Doing so may enable the screws to pull out from the panel due to road vibration or sudden vehicle stops.
  8. Connect from source signal by plugging the RCA cables into the input jacks at the amplifier.
    Always ensure power is off or disconnected at the amplifier before connecting RCA cables. Failure to do so may cause damage to the amplifier and/or connected components.
  9. Connect the speakers. Strip the speaker wires 1/2″ and insert into the speaker terminal and tighten the set screw to secure into place. Be sure to maintain proper speaker polarity. DO NOT chassis ground any of the speaker leads as unstable operation may result.
  10. Perform a final check of the completed system wiring to ensure that all connections are accurate. Check all power and ground connections for frayed wires and loose connections which could cause problems. Install inline fuse near battery connection.

NOTE: Follow the diagrams for proper signal polarity.

This amplifier is not recommended for impedance loads below 1-Ohm bridged.



  1. Turn amplifier gains to minimum (counter-clockwise).
  2. Turn the source unit volume up to 7/8 maximum (or when distortion is just inaudible).
  3. Slowly increase amplifier gain control until adequate volume is achieved.

NOTE: Best signal to noise and dynamic range are realized with gain set to minimum. For a more in depth setting procedure, contact Rockford Technical Support.

Avoid setting amplifier gain high as noise and distortion will greatly increase.


The crossover frequency can be adjusted between 50-250Hz.The crossover is set to LP (Low Pass) only. Turn the crossover adjustment to minimum. With the system playing, turn the crossover adjustment knob up slowly until the desired crossover point is achieved. A good place to start is 80Hz.


The variable 15-40Hz 12dB/octave infrasonic filter limits the amount of low frequency information going to the woofer. Set this to your personal preference while listening to the system one way, then the other.

NOTE: We recommend using the infrasonic filter when using vented enclosures with this amplifier.


This works along with the crossover switch on the amplifier. When set to Low-Pass (LP) operation, this is a variable Bass Boost. Set this to your personal preference while listening to the system.

Overexcursion and subsequent damage may occur at high levels of boost.


When connected, the “Gain Control” is linked and allows you to remotely control the output level of the amplifier from the dash or center console.


NOTE: If you are having problems after installation follow the Troubleshooting procedures below.

Procedure 1: Check Amplifier for proper connections.

Verify that POWER light is on. If POWER light is on skip to Step 3, if not continue.

  1. Check in-line fuse on battery positive cable. Replace if necessary.
  2. Check fuse(s) on amplifier. Replace if necessary.
  3. Verify that Ground connection is connected to clean metal on the vehicle’s chassis. Repair/replace if necessary.
  4. Verify there is 9 to 14.4Volts present at the positive battery and remote turn-on cable. Verify quality connections for both cables at amplifier, stereo, and battery/fuseholder. Repair/replace if necessary.

Procedure 2: Protect light is on.

  1. If the Protect light is on, this is a sign of a possible short in the speaker connections. Check for  proper speaker connections and use a volt/ohm meter to check for possible shorts in the speaker wiring. Too low of a speaker impedance may also cause Protect to light.

Procedure 3: Check Amplifier for audio output.

  1. Verify good RCA input connections at stereo and amplifier. Check entire length of cables for kinks, splices, etc. Test RCA inputs for AC volts with stereo on. Repair/replace if necessary.
  2. Disconnect RCA input from amplifier. Connect RCA input from test stereo directly to amplifier input.

Procedure 4: Check Amplifier if you experienceTurn-on Pop.

  1. Disconnect input signal to amplifier and turn amplifier on and off.
  2. If the noise is eliminated, connect the REMOTE lead of amplifier to source unit with a delay turn-on module.


  1. Use a different 12Volt source for REMOTE lead of amplifier.

Procedure 5: Check Amplifier if you experience excess Engine Noise.

  1. Route all signal carrying wires (RCA, Speaker cables) away from power and ground wires.
  2. Bypass any and all electrical components between the stereo and the amplifier(s). Connect stereo directly to input of amplifier. If noise goes away the unit being bypassed is the cause of the noise.
  3. Remove existing ground wires for all electrical components. Reground wires to different locations. Verify that grounding location is clean, shiny metal free of paint, rust etc.
  4. Add secondary ground cable from negative battery terminal to the chassis metal or engine block of vehicle.
  5. Have alternator and battery load tested by your mechanic. Verify good working order of vehicle electrical system including distributor, spark plugs, spark plug wires, voltage regulator etc.


*These specifications are CEA-2006 Compliant

Specifications subject to change without notice


Rockford Corporation offers a limited warranty on Rockford Fosgate products on the following terms:

Length of Warranty

Speakers, Signal Processors, PRIME and PUNCH Amplifiers – 1 Year POWER Amplifiers – 2Years
Any Factory Refurbished Product – 90 days (receipt required)

What is Covered

This warranty applies only to Rockford Fosgate products sold to consumers by Authorized Rockford Fosgate Dealers in the United States of America or its possessions. Product purchased by consumers from an Authorized Rockford Fosgate Dealer in another country are covered only by that country’s Distributor and not by Rockford Corporation.

Who is Covered

This warranty covers only the original purchaser of Rockford product purchased from an Authorized Rockford Fosgate Dealer in the United States. In order to receive service, the purchaser must provide Rockford with a copy of the receipt stating the customer name, dealer name, product purchased 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 Rockford’s discretion.

What is Not Covered

  1. Damage caused by accident, abuse, improper operations, water, theft, shipping.
  2. Any cost or expense related to the removal or reinstallation of product.
  3. Service performed by anyone other than Rockford or an Authorized Rockford Fosgate Service Center.
  4. Any product which has had the serial number defaced, altered, or removed.
  5. Subsequent damage to other components.
  6. Any product purchased outside the U.S.
  7. Any product not purchased from an Authorized Rockford Fosgate Dealer.

Limit on Implied Warranties

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 assume for Rockford Fosgate any other liability in connection with the sale of the product.

How to Obtain Service

Contact the Authorized Rockford Fosgate Dealer you purchased this product from. If you need further assistance, call 1-800-669-9899 for Rockford Customer Service. You must obtain an RA# (Return Authorization number) to return any product to Rockford Fosgate. You are responsible for shipment of product to Rockford.

EU Warranty

This product meets the current EU warranty requirements, see your Authorized dealer for details.