Rockford Fosgate POWER 1000 MOSFET Owner's Manual

POWER 1000 MOSFET

OWNER'S MANUAL

Rockford

Corporation

613 South

Rockford Drive

Tempe

Arizona

85281

(602) 967-3565

(800) 821-2349

INDEX

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1

SYSTEM FLEXIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 2

AMPLIFIER BRIDGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 2

INPUT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 3

INPUT LEVEL CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 4

POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . P a g e 4

GROUND CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . P a g e 5

INPUT MODE SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 5

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 6

TURN ON CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

SPEAKER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

SPEAKER WIRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 8

SPEAKER IMPEDANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

SPEAKER FUSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 8

PASSIVE CROSSOVER IMPEDANCE . . . . . . . . . . . . . . . . P a g e 9

6 dB/OCTAVE CROSSOVER VALUES . . . . . . . . . . . . . . P a g e 1 0

12 dB/OCTAVE CROSSOVER VALUES . . . . . . . . . . . . . Page 11

SPEAKER POWER RATINGS . . . . . . . . . . . . . . . . . . . . . . . Page 12

PIEZOELECTRIC TWEETERS . . . . . . . . . . . . . . . . . . . . . . P a g e 1 2

BATTERY AND CHARGING SYSTEM . . . . . . . . . . . . . . . Page 13

CROSSOVER SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

POWER 1000 MOSFET SPECIFICATIONS . . . . . . . . . . Page 14

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P a g e 1 5

BIAMPLIFIED MODE DIAGRAM . . . . . . . . . . . . . . . . . . . . Page 17

BIAMPLIFIED STEREO DIAGRAM . . . . . . . . . . . . . . . . . . Page 18

BIAMPLIFIED STEREO BRIDGED

MONO WOOFER DIAGRAM . . . . . . . . . . . . . . . . . . . . Page 19

DUAL STEREO DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

BRIDGED STEREO DIAGRAM . . . . . . . . . . . . . . . . . . . . . Page 21

BRIDGED MONO BIAMPLIFIED DIAGRAM . . . . . . . . . Page 22

W A R N I N G -

Continuous exposure to sound pressure levels over 110 dB may cause permanent hearing loss. High-powered autosound systems may produce sound pressure levels well over 130 dB.

Use common sense as you enjoy your system, and preserve your hearing.

INTRODUCTION

The Rockford Power 1000 MOSFET is an automotive stereo power amplifier which will provide state-of-the-art sound in cars, vans, boats, or wherever a 9 to 16 Volt battery is available.

The Power 1000 MOSFET adjustable input circuits are designed to match almost any music source, from low preamp levels to speaker levels, with negligible noise. The amplifiers will drive all normal speaker types, impedances, and configurations.

Internal protection circuitry in the Power 1000 MOSFET amplifier prevents damage due to shorts, system power problems, or internal failures. The Power 1000 MOSFET incorporates internal battery line filtering and extensive noise prevention circuitry.

The Power 1000 MOSFET amplifier should be PROFESSIONALLY

INSTALLED. The length and nature of your warranty are dramatically affected if you attempt to install it yourself (see

Warranty).

This is because professional installers are experienced with making your car sound right the first time. They make their installation durable because they don’t want continuing problems and complaints - their reputations are valuable.

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SYSTEM FLEXIBILITY

Four bridgeable channels in the Power 1000 MOSFET provide unmatched system flexibility with simple wiring changes. Some of the possibilities are:

Biamplified Stereo - A pair of channels drives mid- and highfrequency speakers; another pair drives the woofers, The external crossover (XV-l) is set to separate the input frequencies into high and low frequencies for each speaker system.

Biamplified Stereo with Bridged Mono Woofer - Otherwise similar to the Biamplified Stereo system above, this arrangement bridges the two low channels into a single woofer.

Bridged Stereo - Each pair of channels on the Left and Right sides is bridged into a full-range speaker system.

Bridged Mono Biamplified - This configuration produces full power into one mono channel. The front channel pair is bridged into a mid-tweeter speaker system and the rear channel pair is bridged into a woofer. The external crossover

(XV-l) is set to separate woofer and midrange frequencies.

Dual Stereo - The power amp acts as two separate stereo amplifiers, one channel pair for rear full range speakers, one for front full range speakers. If only one set of speakers can handle bass frequencies, an external high crossover (XV-l) can be set to cut off the front speakers’ low frequency drive.

Stereo Woofer Amp - Similar to Bridged Stereo except that the inputs are driven by an external crossover (XV-l) with the high frequency drive going to a different amp.

All of these system configurations are obtained with simple wiring variations; there are no special “black boxes” to buy and the system may be modified at any time.

AMPLIFIER BRIDGING

Operating an amplifier in the “bridged” or “strapped mono” mode means driving one speaker or speaker system with two amplifier channels. Each channel will put out full power into its half of the speaker load, so the system can drive the speaker with double the power that a single amplifier channel would be capable of.

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When amplifiers are bridged into a single speaker, each amplifier

“sees” half the total speaker impedance.

Rockford-Fosgate amplifiers are designed so that connecting the amplifier for bridged mode is a simple matter of using the correct speaker leads as shown in the appropriate system diagram. In theseamplifiers, one channel of each pair is inverted in the amplifier. In normal stereo use, the inverted channel output isconnected to the negative lead of its speaker load, thus preserving the system’s polarity. In the bridged mode, the inverted channel is connected to the negative lead of the speaker to be bridged, and the positive lead is connected to the non-inverted channel. This provides the out-of-phase drives required for bridged operation.

The Power 1000 MOSFET is designed so that the four amplifier sections can be bridged in several ways. Right and Left High-

Frequency channels can be bridged. The Right Low and Left

Low-Frequency channels can be bridged, the Right High and

Right Low channels can be bridged together, and the Left Low and Left High channels can be bridged. These combinations allow an unmatched flexibility in designing stereo, biamplified, and hybrid bridged systems.

The Power 1000 MOSFET amplifier can deliver 500 Watts into a bridged 4-Ohm speaker. This is enough power to destroy almost any speaker made. Be sure to use fuses.

INPUT CONNECTIONS (RCA PIN JACKS)

Theamplifier’ssignal inputfemalepin jacksshould beconnected to the source unit’s signal outputs.

If the source unit has “RCA” pin jack outputs, connect the Power

1000 MOSFET to the source with a standard male to male “RCA” cable. In some cases, system noise rejection will be improved by using high-quality braided-shield or double-shielded interconnecting cables.

When the source unit does not have pin jack outputs, get an appropriate adapter from your dealer, or use Rockford adapter cable No. AS-524.

Some higher-powered source units employ “bridged” output circuits (“BTL”outputs). Units with bridged outputsare normally rated at 15 to 25 Watts output by the manufacturer. To connect

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this type of unit to a Power 1000 MOSFET amplifier, the speaker positive (+) wires should go to the adapter cable center conductors, but the cable shield ground must be connected to the source chassis, NOT the speaker negative (-) wires.

Be sure to route the Power 1000 MOSFET signal input cable away from the Orange power wire and the car’s wiring harnesses, to avoid noise coupling.

Pre-assembled interconnector adapters are available from

Rockford Corporation for a wide variety of source units.

NOTE: In most Pioneer pre-amp output units, and some others, the audio shield ground is not at the source chassis common.

For these units, connect the shield lines to both the audio shield and the chassis common.

INPUT LEVEL CONTROLS

The Power 1000 MOSFET input level controls are accessible with a jeweler’s screwdriver through four holes in the cover. The controls are factory-preset to a level which matches most 500 millivolt to 1 Volt rated preamp-output source units.

If you are using the amp in bridged stereo or 2-channel mode adjust only the controls labeled 2-channel/4-channel front. If you are using a fader or crossover before the amplifier then adjust all four channels.

If you are using the speaker-output leads of the source unit, turn the Power 1000 MOSFET input controls fully counterclockwise to their minimum gain position.

If the volume control of the source is “touchy” and/or noisy that is, if just a little volume from the source drives the amplifier into distortion-reduce the Power 1000 MOSFET input gain controls so that the distortion doesn’t start until the source volume is at about 3/4 of its rotation.

If maximum volume from the source won’t drive the Power 1000

MOSFET into distortion, increase the Power 1000 MOSFET input gain controls until distortion starts at about 3/4 volume.

POWER CONNECTION (ORANGE 4-GAUGE WIRE)

The Orange wire must be connected directly to the positive terminal of the battery to provide a power source with a low

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voltage drop and low noise. If the power is connected to any other point (the fuse block, for instance) the amplifier’s power output will be reduced and oscillations and noise may distort the sound. If the power wire must be extended, use only 6-gauge or larger wire and make a good splice.

It is best to use as short a wire run as possible. DO NOT run the power wire next to the input cabling to the amplifier; it wil induce noise.

Avoid running the Orange power wire near the radio’s antenna or power leads, or near sensitive equipment or harnesses. The

Orange power wire carries substantial currents and could induce noise.

The Orange wire is provided with an in-line 100 ampere fuse. Do not use a larger fuse or the amplifier will not be adequately protected, and you risk damage to your car’s electrical system.

GROUND CONNECTION (BLACK 6-GAUGE WIRES)

The ground wires must be connected directly to the car chassis, near the amplifier. Connect the ground wires to separate spots on the chassis at least one foot apart. Ground loops are aggravated by the length of the ground wire orany resistance in the ground path. For this reason we don’t recommend extending the ground wires in any installation.

The ground points in the car should be pieces of chassis metal that are welded to the main body of the car. Painted surfaces should be scraped or sanded clean before the ground lugs are bolted down. (Cover the bare-metal areas with paint or grease to prevent rust.) A dab of Panduit CMP-200-1 between the lugs and the chassis will improve grounding performance.

INPUT MODE SWITCH

The input of the Power 1000 MOSFET normally comes from the

2-channel/4-channel front RCA connectors. However, there are some cases where it is desirable to be able to drive the rear channels independently. For instance, if one wanted to drive the system as two completely independent stereo amplifiers, one would need to drive the front channel with one stereo pair, and the rear channel with another.

The 2-channel/4-channel switch (located on the amplifier front panel) switches the rear channel inputs over to the rearchannel

RCA connectors. To use the amplifier with 4-channel inputs push the switch in.

TURN-ON CONNECTION

(RED WIRE FROM 9-PIN CONNECTOR)

The Power 1000 MOSFET is turned on by applying Positive 12

Volts to the red wire. Usually, the red wire is connected to the source unit’s “Accessory” or “Auto-Antenna” lead, either of which will go positive when the source is turned on.

Although the majority of high-quality automotive source units have an Accessory or Auto-Antenna output, there are many which may require different turn-on methods. If the source has no Auto-Antenna lead (or if Auto-Antenna goes down during tape operation): a) b) c)

Find the internal switched power voltage inside the source unit and solder a lead to it. Run the lead out through the back of the unit (being sure to use a grommet for insulation from the case) and connect to the amplifier turn-on wire.

Or: Install a switch in the car with one terminal connected to +12 Volts and the other to the Power 1000 MOSFET red lead.

Or: Connect the Power 1000 MOSFET red lead to the accessory point at the car’s fuse block. In this case the amplifier will be on whenever the car is on. This method will allow the amplifier to amplify any noise and turn-on and turn-off transients, and may therefore be unsatisfactory.

SPEAKER CONNECTIONS

(WIRES FROM 9-PIN CONNECTOR)

Be certain to observe speaker terminal polarity throughout the system. It is critical for the Power 1000 MOSFET to use the correct negative leads for the right and left channels, since the right negative lead (brown) is the “hot” lead for the right speaker. DO NOT chassis ground any of the speaker leads.

Unstable operation may result.

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SPEAKER WIRE

We recommend that you always use substantial wire for speaker wiring harnesses. For short runs, 18-Gauge wire is the smallest we suggest; for runs over 6 feet, 16-Gauge should be used. Many users find that sound quality is improved by the use of speciallymade heavy-duty speaker wiring from one of several manufacturers. The Power 1000 MOSFET output harness uses short runs of 16-Gauge wire and should not reduce any benefits gained from specialized speaker wiring.

SPEAKER IMPEDANCE

The Power 1000 MOSFET is rated for operation into loads of

2-Ohms or greater in stereo operation.

The primary load on the amplifier comes from directly connected speakers (not isolated by capacitors), and the measured resistance for each side cannot be less than 1.8-Ohms. Single

4-Ohm woofers or parallel 4-Ohm pairs per side will form a high-performance system. The maximum direct load per side is a 4-Ohm speaker in parallel with a 4-Ohm speaker.

If the amplifier load drops below approximately 1 S-Ohms, the

Power 1000 MOSFET amplifier will protect the outputs, causing distortion.

The heaviest load on the power amp normally comes from the woofers. In speaker systems where midrange speakers are isolated with crossover capacitors, only the woofers impedance usually needs to be considered.

SPEAKER FUSING

The Power1000 MOSFET amplifier issupplied with in-linefuses for speaker protection. The Power 1000 MOSFET amplifier is fully protected internally against loading problems, and external fuses are not required for amplifier protection. However, speakers are not normally capable of continuous full-power operation and should be fused to prevent damage due to overheating. The Power 1000 MOSFET is capable of destroying almost any speaker.

The amplifier is provided with Type AGC (3AG) -/-ampere fuses.

This fuse value was selected to provide adequate protection for most high-power 4-Ohm speakers. If a light-duty speaker is

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found to fail frequently, a smaller fuse may be used for better protection. Always use fast-blow type fuses.

If the speaker fuses for the Power 1000 MOSFET are excessively large or are eliminated, the internal protection circuit will operate if the speaker shorts.

PASSIVE CROSSOVER IMPEDANCE

When passive crossover components are used in multiplespeaker systems, the crossover system’s impedance must be considered along with the speaker’s impedance in determining amplifier loading.

For 6-dB per Octave systems (where a single capacitor in series is used for high-pass or single inductor [choke] in series is used for low-pass) the net impedance of the system will be increased and problems are unlikely.

Twelve-dB per Octave systems (where both an inductor and a capacitor are used with each speaker) can cause trouble. A twelve-dB choke-capacitor pair forms a series-resonant circuit to ground whose impedance at resonance is determined by the speaker’s dynamic impedance. For instance, if the speaker is open or disconnected, the crossover input impedance is theoretically ZERO at resonance - a direct short!

Since speaker impedance varies considerably from rated values at various frequencies, it is common to find that “standardized”

12-dB per Octave crossovers (which are designed for pure resistor loads) have serious impedance dips near their crossover frequencies, possibly causing operation of the protection circuit in the amplifier, creating distortion.

We recommend that you be cautious in using 12-dB/Octave crossover systems unless they are specifically designed to have minimal impedance variation for the speakers in use.

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SPEAKER POWER RATINGS

The power rating required for speakers corresponds to the rated output of the amplifier:

SPEAKER POWER RATING

Impedance Non-Bridged Bridged

8 Ohms 100 Watts 300 Watts

4 Ohms

2 Ohms

150 Watts

250 Watts

500 Watts

NO

A problem at high power levels is that some woofers which are rated to handle the power sometimes “pop”, “clang”, “snap”, or otherwise show signs of bottoming. These speakers are designed to use the “air spring” of an enclosed box to prevent bottoming. This applies toalmsot all woofers originally designed for home or professional use. One solution is to use speakers designed for “infinite baffle” use, which have very stiff suspensions. The best solution is to build boxes for the woofers.

PIEZOELECTRIC TWEETERS

Piezoelectric tweeters (“piezos”) offer ruggedness, efficiency and extended frequency capability. They also often have a

“rough” or “harsh” sound due to large response irregularities and distortion. They are usually a difficult load for an amplifier.

One characteristic of piezos is that they are a nearly pure capacitive load. This means that their impedance continuously decreases with increasing frequency. Unless some means is used to prevent this continuous decrease, a typical piezo tweeter’s impedance falls to well under 1-Ohm within the bandwidth of the amplifier. This low capacitive impedance can upset theamplifier’scompensation schemeand cause ultrasonic

(inaudible) oscillations, overheating or damaging the amplifier.

A simple method of preventing problems is to be sure there is at least 6 feet of speaker lead between the amplifier and the piezo.

All Power 1000 MOSFET amps are tested with piezo loads and 6 feet of lead, and they will have no problem.

Another method of taming the piezo is to insert a 1-to10-Ohm

2-Watt resistor in series with one of its leads.

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BATTERY AND CHARGING SYSTEM

High-powered amplifiers will naturally put an extra load on the battery and charging system. A Power 1000 MOSFET may draw up to 50-100 amperes average current.

Standard electrical systems will have to be modified to handle the extra load of an amplifier without problems. If multiple amplifiers are installed, average currents will be high enough to overload the standard alternator and reduce alternator and battery life. In this case it’s a good idea to use a heavy-duty alternator and a high quality battery.

If the sound system will be used often when the car is not running, the battery will obviously be discharged, perhaps enough to prevent restarting. The discharge/recharge cycle will reduce battery life, and alternator life will be shorter because of the high-current recharge requirements.

If problems arise: a) Use a premium battery or deep-discharge marine battery.

b) Use a heavy duty alternator.

c) Use a trickle-charger or battery charger.

d) Install a second battery with a switching system for recharge.

CROSSOVER SETTINGS

Recommended crossover settings to use with an external active crossover (i.e. Rockford Fosgate XV-l). When using the XV-I, reverse the phase of the high channel.

Crossover

Setting, Hz

(Low/High) Suggested Applications

Flat/Flat Dual Stereo systems with two pairs of full range speaker systems. All bridged stereo systems.

Flat/l 00

Flat/275

Dual Stereo systems with front speakers having less bass capability

Dual stereo with small front speakers.

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100/1 00

250/250

100/250

600/600

1500/1 500

4000/4000

“Subwoofer” biamplified systems. Large woofers on low channel, essentially full-range system on high channel (usually a strong midrange-tweeter pair). Excellent imaging.

“Three-way” biamp systems. Woofers on low channel, midranges and tweeters on high channel.

Good imaging.

“Subwoofer” and three-way systems in cars which have a lower-midrange resonance. Combines imaging advantages of subwoofer with reduced midrange power requirements. Excellent imaging.

“Three-way” biamp systems. As above in 250/250 section, but midrange drivers handle less power.

Fair imaging.

“Three-way” biamp systems with a very light duty midrange. “Two-way” biamp systems with widerange woofers on the low channel and extremely rugged tweeters on the high channel.

Primarily a midrange-to-tweeter crossover point for triamplified systems.

SPECIFICATIONS, POWER 1000 MOSFET

POWER RATINGS: 2 CHANNEL (bridged)

4 Ohms: 500 Watts per channel continuous power, both channels driven into 4 Ohms, from 20 to 20,000 Hertz, with less than 0.10% THD+N (Total Harmonic Distortion plus Noise).

POWER RATINGS, 4 CHANNEL:

4 Ohms: 150 Watts per channel continuous power, 4 channels driven into 4 Ohms, from 20 to 20,000 Hertz, with less than 0.05% THD+N (Total Harmonic Distortion plus

Noise).

4 Ohms: 200 Watts per channel continuous power, 4 channels driven into 4 Ohms at 1000 Hertz, with less than 10%

THD+N.

2 Ohms: 250 Watts per channel continuous power, 4 channels driven into 2 Ohms, from 20 to 20,000 Hertz, with less than 0.10% THD+N.

Frequency Response: 20 to 100,000 Hertz +0.5, -3.0 dB.

Damping Factor: At circuit board:

Over 200 (referred to 4 Ohms).

After speaker fuse:

Over 50 (referred to 4 Ohms).

Signal to Noise ratio: Over 80 dB, unweighted.

Slew Factor: over 5.

Slew Rate: over 20 Volts/Microsecond.

IM distortion (IHF): Less than 0.05%.

Input Gain: Variable from 40 dBV to 14 dBV.

Factory pre-set at 32 dBV (correct for most 500 millivolt-rated source units).

Instantaneous Peak Output Current: Over 100 Amperes

PROTECTION:

The POWER 1000 MOSFET is protected by analog-computer output protection circuitry and by a 100-Ampere fuse. A thermal sensor shuts down the amplifier in case of overheating.

DIMENSIONS:

26.1” long by 7.6” wide by 3.6” high, exclusive of mounting ears and wiring.

27.6” long by 7.6” wide by 3.6” high, minimum mounting dimensions.

Weight: 23 Ibs.

Shipping Weight: 35 Ibs.

NOTE: Specifications subject to change without notice.

WARRANTY

From 1 year from the date of purchase (The Warranty Period),

Rockford Fosgate Corporation warrants that any Power 1000

MOSFET which fails to function properly under normal use due to a MANUFACTURING DEFECT, when installed and operated according to the Owner’s Instruction Manual enclosed with this unit, will be repaired or replaced, at Rockford’s option, without charge to you for parts or labor for the actual repair work.

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Proof of purchase must be provided with the returned unit to insure full benefit of the warranty period, for if not, Rockford will be unable to honor the warranty, labor and parts will be charged to you.

The product must be delivered within the warranty period, transportation prepaid, to the Rockford Fosgate Factory, or an authorized Rockford Fosgate warranty service station together with evidence of date and place of original retail purchase.

This warranty does not cover damage due to unauthorized repair, nor does it cover damage due to improper shipping by customer.

You will be responsible for removal and installation of the product. Rockford will pay for the cost of returning the repaired or replacement product to you within the United States.

This warranty does not cover any appearance item, any accessories used in conjunction with the product, or any damage to the product resulting from the alterations, accident, misuse or abuse.

This warranty does not apply if the parts or labor, which would be otherwise provided without charge under this warranty, are obtained from any source other than Rockford or an authorized service center.

Rockford limits its obligation under any implied warranties under state laws to a period not to exceed the warranty period.

Should you have need to obtain service, return product to the

Rockford Fosgate Factory at the address listed below, or call l-800-821-2349 for details on the authorized service center nearest you.

Rockford Fosgate Corporation - 613 South Rockford Drive -

Tempe, Arizona 85281.

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