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Rockford Fosgate PUNCH 4020 DSM Installation & Operation Manual

4-channel amplifier.
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4020 DSM
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   Summary of Contents for Rockford Fosgate PUNCH 4020 DSM

  • Page 2: Practice Safe Sound

    To add the finishing touch to your new Rockford Fosgate image order your Rockford accessories, which include everything from T-shirts and jackets to hats and sunglasses.
  • Page 3: Table Of Contents

    System Diagrams in 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.
  • Page 4: Introduction

    When building a 4-channel amplifier, a major design challenge is to maintain sound quality in a limited space. For the Punch 4020, Rockford Fosgate Engineers designed the Trans• Ana to- pology which is a fast, short loop circuit allowing the output stage to be driven with a low voltage drive signal.
  • Page 5: Rockford Fosgate Accessories

    Cap also has the natural ability to filter DC ripple caused by the alternator which can result in noise in the system. The PCH-C1 will maximize both the sound quality and performance that Rockford Fosgate amplifiers can deliver. Punch Link The Punch Link is a specially cast heatsink interconnect which allows you to join any of our current Punch or Punch Power amplifiers together.
  • Page 6: Technical Design Features

    MOSFET Devices Rockford Fosgate is one of the few manufacturers in any of the sound communities to utilize MOSFET devices in both the power supply and the output stages . MOSFET (Metal Oxide Semicon-...
  • Page 7 to be obtained in amplifiers of desirable package size without resorting to “amplifier-on-a-chip” shortcuts. These advantages are shown below in Figure 1. THE RESULT: Less connections, improved reliability, shorter signal paths, superior signal-to-noise ratio and awesome sonic performance. Figure 1 Thru-Hole TOPAZ (Tracking Operation Pre-Amplifier Zone)
  • Page 8 The Punch 4020 amplifier uses an analog computer process to absolutely maximize safe output power under all operating condi- tions. Rockford Fosgate pioneered and developed RTP (Real Time Protection), a crucial element in the performance edge of our amplifiers. The innovative NOMAD (NOn-Multiplying Advanced...
  • Page 9: Punch 4020 Design Features

    4020 D UNCH 1. Cast Aluminum Heatsink – The cast aluminum heatsink of the Punch amplifier dissipates heat generated by the amplifier's circuitry. The inherent advantage of casting provides a 30% improvement of cooling over conventional extrusion heatsink designs. 2. End Caps – Interchangeable end caps conceal the wiring and input cables, giving the amplifier a clean “stealth”...
  • Page 10 RCA Input Jacks – The industry standard RCA jack provides an easy connection for signal level input. They are gold-plated to resist the signal degradation caused by corrosion. Signal Input Switch – This switch allows selection of 2 channel or 4 channel source unit feed. Input Sensitivity Controls –...
  • Page 11: Installation Considerations

    N S TA L L AT I O N The following is a list of tools you will need for installing the Punch amplifier: Allen wrenches 7/64" & 3/32" (included) Wire strippers Electric hand drill w/assorted bits Wire crimpers This section focuses on some of the vehicle considerations for installing your new Punch amplifier.
  • Page 12: Mounting Location

    Engine Compartment Mounting Rockford Fosgate amplifiers should never be mounted in the engine compartment. Not only will this void your warranty but could create an embarrassing situation caused by the ridicule from your friends.
  • Page 13: Battery And Charging

    Rockford amplifier without problems, although battery and alternator life can be reduced slightly. To maximize the performance of your Rockford Fosgate amplifier, we suggest the use of a heavy duty battery, high output alternator and a stiffening capacitor like the Rockford Fosgate PCH-C1.
  • Page 14 3. Prepare a length of cable to be used for the ground connection. Strip 5/8" of insulation from the end of the cable as described above and connect to the appropriate terminal of the ampli- fier. Prepare the chassis ground by scraping any paint from the metal surface and thoroughly clean the area of all dirt and grease.
  • Page 15: Using The Xcard

    S I N G T H E The crossover functions are controlled through the use of an XCard and can be set for high-pass, low-pass or full range operation. These cards are shipped in the most common fre- quency. Each crossover card has two faces: one face operates Full Range, the other has arrows to indicate the edge for selecting HP (high-pass) or LP (low-pass) operation.
  • Page 16 4020 P OWER ON NE C TIO NS POWER Connect to remote turn-on lead of source unit. Connect to chassis ground of vehicle* Less than 18" Connect to B+ of battery with a 30 amp fuse. *Keep grounds as short as possible. –...
  • Page 17: Sample Wiring Diagrams

    A M P L E 4-CHANNEL STEREO – (Bridged Mono) Front Speakers – 2 Minimum High Frequency Rear XCard* XCard 1 *Note: XCard can be inserted in HP, LP, or Full Range. • Signal input switch to 4 channel input. •...
  • Page 18 4-CHANNEL – STEREO FRONT MONO REAR – (Bridged Mono) Front Speakers – 2 Minimum High Frequency Rear XCard* XCard 1 *Note: XCard can be inserted in HP, LP, or Full Range. • Signal input switch to 4 channel input. • Gain for Front and Rear operate independently. •...
  • Page 19 2-CHANNEL – MONO – (Bridged Mono) Front Speakers 4 Minimum Low Frequency Rear XCard* XCard 1 *Note: XCard can be inserted in HP, LP, or Full Range. • Signal input switch to 2 channel input. • Gain for Front and Rear operate independently. •...
  • Page 20 4-CHANNEL – STEREO/MONO FRONT STEREO REAR – (Bridged Mono) Front Speakers – 2 Minimum High Frequency 4 Minimum Low Frequency • Signal input switch to 4 channel input. • Gain for Front and Rear operate independently. • Front is operating in stereo/MONO. •...
  • Page 21: Troubleshooting

    R O U B L E S H O O T I N G Symptom Amplifier does not Voltage applied to the turn on. REM terminal of the (Power LED is off) amplifier is not between 10.5 and 15.5 volts or there is no voltage present.
  • Page 22 Symptom Speaker Output Input gain signal for Low or Distorted amplifier set too low. Source unit output too low. Speakers wired out of polarity from the left to right channel. XCards are missing or not placed properly in crossover slots and/or switch not properly se- lected.
  • Page 23 Symptom Engine Noise on the Speaker Out- puts of the Ampli- fier • If noise persists, see your Authorized Rockford Fosgate Dealer. Diagnosis Speaker leads shorted to each other or to the chassis of the ve- hicle. RCA input from source...
  • Page 24: Dynamic Power Measurements

    Real World operation of an amplifier. Many manufac- turers, including Rockford Fosgate, at times will measure amplifier power into a fixed resistor (4 Ohm, 2 Ohm). While this method is useful in some types of evaluation and testing, it is not representative of an amplifier that is connected to a speaker and playing music.
  • Page 25 Information Cubed The data acquired in the testing procedure is then graphed in the form of a 3-dimensional cube. Hence the name PowerCube. The Phase Angle is expressed on the horizontal axis, the Output Voltage is presented on the vertical axis and the Impedance is displayed on the Z axis.
  • Page 26: Specifications

    P E C I F I C AT I O N S Continuous Power Rating (Competition Standard) - Measured at 13.8V RMS continuous power per channel, all channels driven into a 4 load from 20-20,000Hz with less than 0.05% Total Harmonic Distortion (THD) RMS continuous power per channel, all channels driven into a 2 load from 20 to 20,000Hz, with less than 0.1% THD...
  • Page 27: Warranty Information

    Electronics found to be defective during the warranty period will be repaired or replaced at Rockford Fosgate’s discretion. Repaired or replaced electronics will be covered by the balance of the original warranty period only. Rockford Fosgate shall not be responsible for any incidental or consequential damages resulting from a defect in electronics.
  • Page 28 10/94 MAN-0808-A Rockford Fosgate Rockford Corporation 546 South Rockford Drive Tempe, Arizona 85281 U.S.A. In U.S.A., (602) 967-3565 In Canada, call Korbon (905) 567-1929 In Europe, Fax (49) 4207-801250 In Japan, Fax (81) 559-79-1265...

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