Rockford Fosgate Power 360 Bedienungsanleitung

INSTALLATION MANUAL

FOR

ROCKFORD

FOSGATE

POWER 360

AND

POWER 650

Rockford

Corporation

613 South

Rockford Drive

Tempe

Arizona

85281

(602) 967-3565

INDEX

Introduction .............................................

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

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

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

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

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

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

Speaker Wire ............................................

Power Ratings ...........................................

Piezoelectric Tweeters ...................................

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

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

Crossover Settings .....................................

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

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

DIN Interconnect Cable .................................

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

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

Mounting the 360 .......................................

Power 650 Specifications ...............................

Power 360 Specifications ...............................

Biamplified Mode Wiring Diagram ....................... 19

Power 6501360 Stereo Biamplified Mode Wiring Diagram . 19

Biamplified Stereo Diagram ............................. 20

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

Dual Stereo Diagram ................................... 22

Bridged Stereo Diagram ................................ 23

Bridged Mono Biamplified Diagram ...................... 24

INTRODUCTION

The Power 650 and Power 360 are state-of-the-art 4 channel

power amplifiers for cars, vans, or wherever a

12-volt

battery is

available.

The amplifiers are designed to be used with a Rockford-Fosgate

equalizer/pre-amplifier

and any high-quality radio, tape, or

other music source. There are several

equalizer/pre-amplifier

units available, including the ZX, and Z, and the 250 preamp.

The Power 650 will provide 325 watts per channel (stereo) and

incorporates a variable-speed fan and shroud assembly for

cooling.

The Power 360 provides 180 watts per channel (stereo) and

cooled by a finned heatsink.

Both the Power 650 and Power 360 offer exceptional flexibility in

system design. With switchable crossovers and four bridgeable

power amplifier channels, biamplified systems, high-powered

bridged systems, combinations, and four-channel systems are

easy to put together. Both amplifiers are stable into 2-ohm

loads, or 4-ohm loads when bridged.

Protection circuitry in the amplifiers prevent damage due to

shorts, system power problems, or internal failures. They

incorporate internal battery line filtering and extensive noise

prevention circuitry.

The Power 650 and Power 360 are designed to 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. Professional

installers make their installations durable because they don’t

want continuing problems and complaints -their reputations

are valuable.

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

and Good Luck!

-l-

AMPLIFIER FEATURES

The Power 650 and Power 360 are very similar in design. Both

have selectable crossovers, four bridgeable channels, load

protection, independently available bass channels, and noise

rejection circuitry. System wiring for the two amplifiers is

identical.

The Power 650’s variable-speed fan-cooling assembly allows it

to run at higher power and into lower-impedance loads than the

Power 360. With four 4-ohm loads, each channel of the Power

650 puts out 125 watts, while the 360 puts out 90. The Power 650

is rated for four 2-ohm loads, at 160 watts each or two 4-ohm

loads in bridged stereo at 325 watts each. The Power 360 is not

rated for 2-ohm loads, and the bridged output is two 8-ohm

loads at 180 watts each.

-2-

SYSTEM FLEXIBILITY

A combination of switched crossovers and four bridgeable

channels in the Power 650 and Power 360 provide 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 -This configuration produces watts

into one mono channel. The high-frequency channel pair is

bridged into midtweeter speaker system and the

low-

frequency pair bridged into a woofer. The crossovers 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 for front

full-

range 4-ohm 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.

-3-

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.

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 and Power 360 are designed so that the four

amplifier sections can be bridged in several ways. Right and Left

High-Frequency channels can be bridged, the Right High 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.

-4-

DIN

COllfl

INPUTS

RCA

Conn

POWER

650/360

AMPLIFIER BLOCK DIAGRAM

-5-

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 apair 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

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.

-6-

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 IMPEDANCE

The Power 650 is designed for a 2-ohm nominal minimum

impedance on each of its four channels. (Two 4-ohm speakers

in parallel form a 2-ohm load.)

The Power 360 is designed for a 4-ohm nominal minimum

impedance on each of its four channels.

In bridged mode (two amplifier channels driving a single load),

each channel “sees” half of the load impedance. Therefore the

Power 650’s minimum load impedance in bridged mode is

ohms, and the Power 360’s minimum is 8-ohms.

If an output wire from the amplifier shorts, or if the load

impedance drops below safe minimums, the amplifier will go

into short protection mode. In “shortstop” the amplifier will turn

off for several seconds every time it senses an overload.

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, at least 16-Gauge should be

used.

Never allow any speaker wire to touch chassis ground. Many

users find that sound quality is improved by the use of specially-

made heavy-duty speaker wiring from one of several manu-

facturers. The Power 650 and 360 output harnesses use short

runs of

16-Gauge

wire and should not reduce any benefits

gained from specialized speaker wiring.

-7-

SPEAKER POWER RATINGS

The Power 650 and 360 are very high-powered amplifiers, and

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

handle the power levels. The speaker manufacturer’s recom-

mendations for power levels and crossover frequencies should

be observed.

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

frequency, a given midrange driver will handle 20-150% 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

frequency and slope of their crossovers: the higher the

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

will handle. Tweeter types that are usually above average in

power handling ability include ferrofluid-cooled domes

inches in diameter or larger.

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

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