Rockford Fosgate POWER 650 MOSFET Bedienungsanleitung

POWER

650

MOSFET

POWER

AMPLIFIER

INDEX

INTRODUCTION ........................................

Amplifier Features .......................................

MOSFET Power Amplifiers ...............................

System Flexibility ........................................

Amplifier Bridging .......................................

Speaker Impedance .....................................

Amplifier Block Diagram .................................

Why Biamplify? .........................................

Speaker Power Ratings ..................................

Speaker Fusing ..........................................

Internal Fusing.. ........................................

Crossover System .......................................

Using the Crossovers ....................................

Typical Crossover Settings ..............................

Speaker Phasing .......................................

Crossover Response Curves ............................

Amplifier Power Wiring ..................................

Din Interconnect Cable .................................

Input Mode Switch .....................................

Battery and Charging System ...........................

Passive Crossovers .....................................

6 dB/Octave Crossovers ................................

12 dB/Octave Crossovers ...............................

18 dB/Octave Crossovers ...............................

Turn on Connection ....................................

Amplifier Mounting .....................................

Power 650 MOSFET Specifications ...................... 20

Biamplified Stereo Mode Wiring Diagram ................ 22

Biamplified Stereo Diagram ............................. 23

Biamplified Stereo Bridged Mono Woofer Diagram ....... 24

Dual Stereo Diagram ................................... 25

Bridged Stereo Diagram ................................ 26

Bridged Mono Biamplified Diagram ...................... 27

INTRODUCTION

The Power 650 MOSFET is a high-performance four-channel

power amplifier for cars, vans, or wherever a 12-volt battery is

available. It is designed to be used with a Rockford-Fosgate

equalizer/pre-amplifier and/or any high-quality radio, tape

player, compact disc player, or other music source.

Power amplifiers with rugged, fast MOSFET design and forced-

air cooling system combined produceeffortless performance at

over 650 Watts total output power. Switch-controlled crossovers

and easily-bridgeable, load-tolerant amplifiers make biamplified

systems, bridged systems, four-channel systems, and combina-

tions easy to design.

Protection circuitry in the amplifier prevents damage due to

load shorts, system power problems, and internal failures. The

amplifier incorporates internal battery line filtering and exten-

sive noise prevention circuitry.

The Power 650 MOSFET is designed to be professionally

installed. The length and nature of your warranty are dramat-

ically affected if you attempt to install it yourself (see Warranty).

Skill and experience are required to achieve high-end sound,

reliability, and appearance in a high-powered autosound

system. If you want to install your own unit, read this booklet

completely, research speaker systems and source units

extensively

and good luck!

POWER 650 MOSFET FEATURES

The Power 650 MOSFET amplifier combines a number of

capabilities that make it the highest-performance amplifier on

the road.

l 650 Watts total power (stereo mode, 4-Ohm loads)

l 4-, 3-, or 2-channel operation, biamplified or stereo

l Rugged and fast MOSFET design

l 30-Ampere peak current capacity each channel

l Thermostatically controlled fan for cooling

l Built-in selectable electronic crossovers

l Built-in bridging capability

l 2-Ohm load rated, each channel

l Selectable independant stereo operation

l Extensive noise-rejection circuitry

l Full internal protection

l Single-chassis, easy-installation design

MOSFET POWER AMPLIFIERS

Conflicting demands on the power output transistors of high

power amplifiers often force compromises in performance.

Designing for the raw power and current required to force a

recalcitrant woofer into position calls for large, rugged power

transistors, which may be too sluggish to reproduce transients

and high frequency material cleanly.

The new MOSFET (Metal Oxide Silicon Field Effect Transistor)

power devices combine the compactness and efficiency of

bipolar transistors with many of the advantages of tubes.

Compared to an equivalent bipolar transistor, the MOSFET is

much faster, more rugged, more linear, and requires less drive

power. The Power 650 MOSFET output stages take advantage

of MOSFET performance to improve virtually every per-

formance characteristic. Speed, distortion, current capacity,

and ruggedness are exceptional.

The result is an amplifier with superb smoothness and transient

response, combined with the raw power and current required to

drive complex low impedance loads effortlessly. In essence, the

amplifier will cleanly drive any load which does not blow its

internal fuses.

-2-

SYSTEM FLEXIBILITY

A combination of switched crossovers and four bridgeable

channels in the Power 650 MOSFET provides unmatched

system flexibility with simple wiring changes. Some of the

possibilities are:

Biamplified Stereo

A pair of channels drives mid and high

frequency speakers; another pair drives woofers. The cross-

overs are 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 arrange-

ment bridges the two low channels into a single woofer.

Bridged Stereo

Each pair of channels on Left and Right sides

is bridged into a full-range speaker system. The crossovers

are set at Flat position.

Bridged Mono Biamplified

Both Left and Right channels

combine into one mono channel. The high-frequency

channel pair is bridged into midtweeter speaker system and

the low-frequency pair is bridged into a woofer. The cross-

overs are set to separate woofer and midrange frequencies.

Dual Stereo

With the crossovers set at “Flat” position, the

power amp will act as two separate stereo amplifiers, one

channel pair for rear full range speakers, one pair for front

full-range speakers. If only one set of speakers can handle

bass frequencies, the “High” crossover can be set to cut off

the front speakers’ low frequency drive.

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.

-3-

When amplifiers are bridged into a single speaker, each

amplifier “sees” half of the total speaker impedance.

New Rockford-Fosgate amplifiers are designed so that con-

necting the amplifier for bridged mode is a simple matter of

using the correct speaker leads as shown in the appropriate

system diagram. In these amplifiers, one channel of each pair is

inverted in the amplifier. In normal stereo use, the inverted

channel output is connected to the negative lead of its speaker

load, thus preserving the system’s polarity. In bridged mode, the

inverted channel is connected to the negative lead of the

speaker to be bridged, and the positive lead of the speaker is

connected to the non-inverted channel. This provides the out-

of-phase drives required for bridged operation.

The Power 650 MOSFET is designed so that the four amplifier

sections can be bridged in several ways. Right High 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

High and Left Low channels can be bridged. These combina-

tions allow an unmatched flexibility in designing stereo,

biamplified, and hybrid bridged systems.

The Amplifier Block Diagram shows a simplified diagram of the

crossover and amplifier system. In the amplifier blocks, the

input shows a “+” for the non-inverted channels and a “-” for the

inverted channels. Each

“+”

channel can be mated to a

“-”

channel into a bridged speaker load.

SPEAKER IMPEDANCE

The Power 650 MOSFET is designed to drive 2-Ohm minimum

speaker loads on each of its four channels, or 4-Ohm minimum

loads when used in Bridged mode (two amplifier sections

driving the same speaker). A 2-Ohm load is formed by

paralleling two 4-Ohm speakers or four 8-Ohm speakers. Of

course, higher-impedance loads than the minimum are entirely

acceptable to the amplifier.

Speakers which are isolated from the amplifier by series

capacitors or high-pass crossovers (for instance, tweeters) do

not usually have a large effect on the amplifier load and should

not be considered in calculating load impedance. The 650

DIN

Conn

INPUTS

POWER 650 MOSFET

AMPLIFIER BLOCK DIAGRAM

-5-

MOSFET is also very tolerant of reactive loads, so complex

multiple-element passive crossover systems should pose no

problems if well-designed.

WHY BIAMPLIFY?

For the performance. Biamplified systems can play cleanly at

higher output levels than stereo systems of the same total

power.

For the convenience. Building a satisfactory crossover system

for woofer-to-midrange crossover frequencies requires large,

expensive inductors and capacitors, as well as design time and

mounting problems. With a biamplified system it’s all done for

you in the active crossover.

Biamplified systems consist of an active (electronic) crossover

system and two stereo amplifiers. The crossover separates the

input signal into low and high-frequency groups and sends each

group of frequencies to a separate amplifier pair. In most

installations, the low-frequency amplifiers drive a pair of

woofers and the high-frequency amplifiers drive a

midrange-

tweeter pair.

In ordinary stereo systems, as the output level increases, the

low-frequency, high-power notes of the music start to drive the

amplifier into clipping. When the bass (drums, rhythm, etc.)

start to overload the amplifier, all higher frequencies are

naturally clipped as well, so midrange distortion is immediately

audible. The harshness and “gargling“ effects of clipping are

obnoxious to listen to and may destroy tweeters.

In a well-designed biamplified system, when the low frequencies

start to clip only the low-frequency amplifiers overload. The

high-frequency amplifiers are still reproducing the music

cleanly. Harshness and other overload effects are not heard in

the middle and high frequencies until the high-frequency

amplifiers clip, at a much higher level. The worst effects of the

bass amplifiers’ clipping will usually not be audible, since the

woofers won’t reproduce the high-frequency harmonics of the

clipped drive, and the clean middle and high frequencies cover

the low-frequency blurring and muddiness of the bass.

We have found that, for crossover frequencies up to about 600

Hertz, it is best to use approximately equal power for the low and

-6-

high frequency amplifiers of biamplified systems. If the high-

frequency amplifiers are significantly lower in power, the highs

will clip before bass distortion is audible, and much of the bass

power capability will be wasted.

Triamplifying; that is, using another active crossover and stereo

amplifier to run the tweeters only, is technically interesting but

less cost-effective. For one thing, there is little or no masking

effect from the very high frequencies for midrange distortion, so

the biggest performance advantage of multiple-amp systems

isn’t available. Crossover components for passive midrange-to-

tweeter crossovers are reasonably small and inexpensive.

Running a separate tweeter amp system will prevent tweeter

burnout due to heavy midrange clipping, and this is the most

substantial advantage of triamplified systems.

SPEAKER POWER RATINGS

The Power 650 MOSFET is a very high-powered amplifier, and

special care must be taken to be sure that the speakers can

handle the power level. Speaker manufacturers’ recommenda-

tions for power levels and crossover frequencies should be

observed. The power capacity required for speakers cor-

responds to the rated output of the amplifier and the mode of

operation. Minimum output into various loads is shown below:

MODE 4-Ohm Speaker 8-Ohm Speaker

Stereo 125 Watts 75 Watts

Bridged 325 Watts 250 Watts

Woofers with high power ratings 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 at high power inputs. This applies to most

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.

As with woofers, midrange drivers’ power capabilities are

determined by voice coil and suspension design. The most

common power-handling problems for mid-ranges arise when

they are crossed over at too low a frequency or with too shallow

a crossover slope. For every doubling of the crossover

-7-

frequency, a given midrange driver will handle 2040% more

system power. The same improvement would result from going

from a 6dB/Octave to a 12dB/Octave crossover.

Tweeters will react the same as midranges to changes in the

frequency and slope of their crossovers: the higher the

frequency and the greater the slope, the more power the tweeter

will handle. In view of the high power capacity of the 650

MOSFET, it is likely that all but the most rugged tweeters will

require more than a simple single-capacitor crossover. Twelve-

dB-per-Octave or even 18-dB-per Octave passive crossovers

will help typical tweeters to survive. (See “Passive Crossovers”

section of this booklet.)

SPEAKER FUSING

The Power 650 MOSFET is provided with in-line fuses for

speaker protection. These fuses should always be fast blow types

and should be selected on the basis of the speaker’s power

handling capacity. Three Ampere type AGC (3AG) fast-blow

fuses are provided as standard.

The speaker fuses are not required to protect the 650 MOSFET

power amplifier and may be eliminated if desired. However,

speaker fuses of 6 Amperes or less will avoid the inconvenience

of replacing internal fuses in case of a speaker or wiring short.

SHOULD BE NOTED THAT WHEN USING ONLY THE

INTERNAL FUSES, THE 650 MOSFET IS CAPABLE OF

DESTROYING VIRTUALLY ANY UNPROTECTED SPEAKER,

DUE TO THE POWER AVAILABLE.

INTERNAL FUSING

The ruggedness of triple paralleled MOSFET devices allows the

elimination of both short-protection shutdown (shortstop) and

Safe Operating Area current limiters, allowing the amp to drive

extremely reactive loads without distortion or shutdown.

Amplifiers are protected by two 7.5 Ampere type AGA (1AG)

fuses per channel. The internal fuses are accessible through a

flush mounted hatch on the mounting side of the amplifier.

Replace internal fuses only with 7.5 Ampere type AGA (1AG)

fast blow fuses. Always disconnect the main power wire (White

8 Gauge) from the battery before removing the fuse access

hatch.

-8-

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