Rockford Fosgate PUNCH 4020 DSM manual

  P UNCH 4020 DSM 4 -C HANNEL A MPLIFIER ® ® I NST ALLA TION & O PERA TION[...]

Dear Customer, Congratulations on your purchase of the world's finest brand of car audio amplifiers. At Rockford Fosgate we are committed to 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 prod[...]

G ETTING S T ARTED T ABLE OF C ONTENTS Introduction ...................................................................................... 1 Punch 4020 Amplifier Accessory Pack .............................................. 1 Rockford Fosgate Accessories ............................................................ 2 Technical Design Features ......[...]

– 1 – I NTRODUCTION The Punch 4020 is a 4-channel amplifier which offers 20 Watts per channel when driven into 4 Ohms. The amplifier utilizes a 2/ 4 input selector switch and XCard crossovers. 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 Engin[...]

– 2 – R OCKFORD F OSGA TE A CCESSORIES The following accessories were designed to enhance the perfor- mance of the Punch 4020 amplifier. Energy Storage Capacitor (PCH-C1) The Punch 1 farad capacitor is used to provide extra current needed by amplifiers to reproduce musical transients. The Punch Cap also has the natural ability to filter DC ripp[...]

– 3 – T ECHNICAL D ESIGN F EA TURES ◆ trans• ana The trans• ana ( TRANS conductance A dvanced N on-multiplying A mplifier) is a novel circuit that utilizes a short-loop complemen- tary topology and advanced Real Time Protection circuitry. THE RESULT: An amplifier design with the benefits of tube and bi- polar transistor amplifier design w[...]

– 4 – 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 Surface Mount Component [...]

– 5 – ◆ XCard (Internal Crossover) The Punch 4020 amplifier utilizes internal active crossovers. These crossovers have many performance advantages such as using dis- crete components for exact frequency adjustments which are far superior to potentiometers. Additionally, the XCard can be config- ured for high-pass, low-pass and full range oper[...]

P UNCH 4020 D ESIGN F EA TURES 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 [...]

– 7 – 6. 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. 7. Signal Input Switch – This switch allows selection of 2 channel or 4 channel source unit feed. 8. Input Sensitivity Controls – The input level controls [...]

I NST ALLA TION C ONSIDERA TIONS – 8 – This section focuses on some of the vehicle considerations for installing your new Punch amplifier. Checking your battery and present sound system, as well as pre-planning your system layout and best wiring routes will save installation time. When deciding how to lay out your new system, be sure that each [...]

M OUNTING L OCA TION The mounting location and position of your amplifier will have a great effect on its ability to dissipate the heat generated under normal operation. The design of our cast aluminum heatsink serves to easily dissipate the heat generated over a wide range of operating condi- tions. However, to maximize the performance of your amp[...]

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[...]

– 11 – 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. Strip the o[...]

– 12 – U SING THE XC ARD 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-pas[...]

4020 P OWER C ONNECTIONS – 13 – 4 5 10 POWER Connect to remote turn-on lead of source unit. Connect to chassis ground of vehicle* Connect to B+ of battery with a 30 amp fuse. Less than 18" B+ GND REM *Keep grounds as short as possible.[...]

S AMPLE W IRING D IAGRAMS – 14 – 4-CHANNEL STEREO + – 2 Ω Minimum High Frequency + – 2 Ω Minimum Low Frequency + – Front Gain Front Rear Rear Gain (Bridged Mono) + L – + R – (Bridged Mono) Front Speakers Rear Speakers + – – L + – R + R L R L Front Rear • Signal input switch to 4 channel input . • Gain for Front and Rear [...]

– 15 – 4-CHANNEL – STEREO FRONT MONO REAR 4 Ω Minimum Low Frequency + – 2 Ω Minimum High Frequency + – Front Gain Front Rear Rear Gain (Bridged Mono) + L – + R – (Bridged Mono) Front Speakers Rear Speakers + – – L + – R + R L R L Front Rear *Note: XCard can be inserted in HP, LP, or Full Range. XCard 1 XCard 2 HP LP Rear XCa[...]

– 16 – Rear XCard* Front XCard* • Signal input switch to 2 channel input . • Gain for Front and Rear operate independently. • Front is operating in mono. • Rear is operating in mono. XCard 1 XCard 2 LP LP *Note: XCard can be inserted in HP, LP, or Full Range. 4 Ω Minimum Low Frequency – + Front Gain Front Rear Rear Gain (Bridged Mon[...]

– 17 – 4-CHANNEL – STEREO/MONO FRONT STEREO REAR + – 4 Ω Minimum Low Frequency + – 2 Ω Minimum High Frequency + – 2 Ω Minimum High Frequency – + Front Gain Front Rear Rear Gain (Bridged Mono) + L – + R – (Bridged Mono) Front Speakers Rear Speakers + – – L + – R + R L R L Front Rear 2 Ω Minimum High Frequency • Sign[...]

T ROUBLESHOOTING – 18 – Amplifier does not turn on. (Power LED is off) Symptom Diagnosis Remedy Voltage applied to the REM terminal of the amplifier is not between 10.5 and 15.5 volts or there is no voltage present. Voltage to the B+ termi- nal of the amplifier is not between 10.5 and 15.5 volts or there is no voltage present. Amplifier is not [...]

Speaker Output Low or Distorted Readjust input gains of amplifier. Check system with known working source and repair or replace orignal source as needed. Check speaker polarity and correct as needed. Check signal input switch and XCard positons and repair or replace as neces- sary. Check the alternator, bat- tery, fuse and wiring and repair as nece[...]

– 20 – Engine Noise on the Speaker Out- puts of the Ampli- fier Disconnect existing speak- ers and test with known working speakers. If engine noise is gone, check and repair wiring and installa- tion of speakers as neces- sary. Check connections, substi- tute with known working cables and repair or replace as necessary. Run the RCA cable on a [...]

– 21 – D YNAMIC P OWER M EASUREMENTS About the Dynamic Power Measurements The Audio Graph PowerCube is a test instrument used to measure the output of an amplifier in accordance with IHF-202 industry stan- dards. The IHF-202 standard is a dynamic power measurement and was developed as a means of measuring power in a manner that best represents [...]

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. Output Power, in watts, is listed on the left hand side f[...]

– 23 – S PECIFICA TIONS Continuous Power Rating (Competition Standard) - Measured at 13.8V RMS continuous power per channel , all channels 20 Watts driven into a 4 Ω load from 20-20,000Hz with less than 0.05% Total Harmonic Distortion (THD) RMS continuous power per channel , all channels 30 Watts driven into a 2 Ω load from 20 to 20,000Hz, [...]

W ARRANTY I NFORMA TION Rockford Fosgate warrants all electronics to the original consumer/purchaser to be free from defects in materials or workmanship for a period of three (3) years. We will cover parts and labor provided the product was purchased from an Authorized Rockford Fosgate Dealer. This warranty does not apply to any product on which th[...]

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 10/94 MAN-0808-A[...]