Soundstream MC.500 Manual de usuario

MC 500

Five Hundred Watt

Multiple-Channel

Amplifier

Thank you for purchasing a Soundstream amplifier. You now own the finest high

power amplifier available, a precision component capable of audiophile-quality

performance.

CONTENTS

Wiring diagram

Design feature

Installation

Power connections

Remote power-on connection

LED power indicators

Selecting operating mode

Input connections

Output connections

Optimizing for speaker impedance

Input level adjustment

Linear Subwoofer Extension

Protection circuits

Service

Specifcations

Figure

I2Channel

Opmztian

Flgun 2

3.Channel

OperatIm

,-,

-4-

7-.

DESI6U

FEATURES

The Soundstream MC500 is the ultimate amplifier for high-power automotive

applications.

The MC500 is conservatively rated at 500 watts into 4 ohms. This power can

be divided into four channels (4 x 125 watts.), three channels (2 x125 watts,

250 watts), or stereo (2 x 250 watts).

Each output device is individually

rated at 125 watts, and there are 24 discrete output devices in the MC500, for

a total of 3 kilowatts of device capability. With such reserves and no current

limiting, the MC500 operates without strain even at maximum output. Power,

ground, and speaker connectors are rated to handle up to 80 amps and up to

6 gauge wire.

The MC 500 incorporates a unique protection system that prevents thermal

overload without the need for a fan. Should the unit approach an overheated

condition, dynamic headroom is reduced instead of a complete shutdown,

until normal operating temperature is reached. Then full output capacity is

restored.

The entire process is automatic and inaudible. In the case of a

malfunction which should cause continued overheating, secondary thermosats

will shut down the amplifier in a conventional manner.

An especially useful feature of the MC500 is the Linear Subwoofer Extension

Circuit

(LSE),

which

c.ompensates

for the natural

rolloff

of most speakers and

extends bass as much as a full octave. LSE provides a

~linear

boost of 6

dB/octave.

starting at a point which is continuously variable over the range 35-280 Hz.

A steep 24

dB/octave

filter attenuates the signal below 20 Hz.

Only premium parts are used in the MC500, such as metal-film resistors,

go!d-

plated input connectors, and

imnersible

sealed potentiometers. The case is

equipped with generous heat sinks. Input sensitivity is adjustable to match

any tuner/deck--the MC500 can even be used as a power booster.

-5-

The MC500 features dual-monaural construction, with two fully independent soft

regulated pulse-width modulated power supplies that provide stability for

low-

impedance reactive loads (down to 2 ohms/4 channel operation) and still allow

greater than 2

IHF dynamic headroom. All gain devices are biased by regu-

lated active current sources, so that even low-frequency performance is

unaffected by supply-line noise and temperature fluctuations.

INSTALLATION

Proper

installation and adjustment will reward you with reliable operation and

optimum performance. Automotive sound system installations can be tricky,

especially for first timers. For this reason, you may want to consider using

a professional installer who has the tools and, more importantly. the experience,

to do the job right.

you decide to install your equipment yourself, we hope

that this manual will serve as a helpful guide.

Location and mounting

The first step in installation is thorough planning. Choose the location for

your amplifiercarefully. The amplifier should be located in either the passen-

ger compartment or the trunk, never in the engine compartment or in any outside

location exposed to dirt and moisture. Adequate ventilation is important; allow

enough space so that air can circulate around the heat sinks.

Make sure that the installed amplifier will not interfere with normal operation

of the car.

It is best not to locate the amplifier near your antenna. because

the switching power supply can interfere with AM reception.

Your amplifier should be mounted firmly to your car's sheet metal with the four

screws provided.

Use your amplifier as a template for making pencil-marks

where you intend to drill.

(Do

not operate your drill through these mounting

holes.)

It's a good idea to bench test your system before mounting the components.

you have a 12-volt power source, you can connect and test all the

commponents

outside the car.

Or you can connect then inside the car before screwing them

down.

Either way, connect the components exactly as you intend to in the final

installation: make all power connections last; test the system; then discon-

nect all power until the final installation is complete.

Wiring

Determine how your car's wiring is laid out, and run your wires in the same

locations when possible. Many passageways,wire-hooks, and strain relief devices

already exist in your car; take advantage of them. Keep all wiring inside the

car.

Good standard audio practice suggests keeping signal wires short and

away from power lines.

Wires can be run under carpet. If you drill a new

passage-hole through metal, make sure no burrs remain to scrape the wire; use

grommets as needed. All wires should be hidden; an exposed wire can inadver-

tently be pulled, causing disconnection or shorting. Wires should never be

under tension or subject to moisture. Use cable ties to bundle excess wire.

POWER CONNECTIONS

NOTE: Your amplifier can only be operated from a 12-VOLT NEGATIVE GROUND

electrical system. If your car was produced before 1970, or if you have any

doubts, make sure of the type of electrical system you have before making any

connections.

The MC500 will draw up to 70 amperes if used to its fullest capability. Deter-

mine the alternator rating of your car and the current consumption of the car's

other accessories. It may be necessary to upgrade the alternator or to install

a separate battery, especially

cold climates.

For power wiring, use 8-gauge wire or larger. (Smaller gauge numbers denote

larger wire.) The (PLUS

12V>

terminal

((3,

in the wiring diagram) should be

connected directly to the positive

(+)

terminal of your car battery.

Install

two

(2)

30 amp fuses (in parallel) in the line close to the battery terminal.

If you have more than one amplifier, each amplifier should be separately fused.

The

(GROUND,

terminal

(2)

should be connected directly to the automobile chassis

with 8-gauge wire or larger. Make this wire as short as possible to prevent

noise in the system.

A nearby bolt can serve as a ground terminal. Make sure

that the wire contacts bare metal, not coated metal or paint.

It is important

that the ground connection you select

hav_

minimal noise resistance to the

battery ground post (a maximum of 0.1 ohm).

REEIOTE

POWER-ON CONNECTION

If your tuner/deck has a remote power-on control wire or terminal, connect it

to the <REMOTE> terminal

(1)

on your amplifier. This is a control line, not a

power line, so small wire (18-20 gauge) is acceptable.

If your tuner/deck has no remote power-on control labeled as such, but has a

power antenna control,it may be possible to wire the power antenna control to

the (REMOTE) terminal.

..-

-a-

If your tuner/deck has neither a remote power-on control wire nor a usable

power antenna control, it will be necessary either to connect the <REMOTE>

terminal

+I2

volt source which is switched by the ignition key, or to con-

nect the (REMOTE> terminal to a constant t12 volt source through an on-off switch

you install in series with the ignition switch in a location accessible to

the driver.

LED

PDUER

INDICATORS

The two main channels of the MC500 (A and

are completely independent, and

each has its own LED indicating power-on:

(13)

for main CHANNEL A, and

(24)

for

main CHANNEL

Since power should be disconnected during installation, these

LEDs

should be dark until you are finished! Both

LEDs

will go out if the

power-line fuses are blown; if a chassis fuse is blown, only the LED for that

amplifier section will go out.

SELECTIND

OPERATING

mDE

The five hundred watts available from the MC500 can be divided into two

channels (stereo) [Figure 11, three channels (stereo plus a single-channel

subwoofer) [Figure

21,

or four channels (front and rear stereo; or stereo

bi-amp) [Figure

31.

To select any of these modes, remove the plug covers marked CHANNEL A and

CHANNEL B on the bottom of the amplifier switch.

-9.

For two-channel operation, set both switches to <MONO>.

For three-channel operation, set one switch to <STEREO>

and the other to (MONO). Note carefully which

is which, because you must connect wires

accordingly.

For four-channel operation, set both switches to <STEREO>.

INPUT CONNECTIONS

Inputs to the amplifier attach by means of standard RCA-type jacks. The MC500

achieves a level of performance at which cable and connector quality is sig-

nificant; the jacks on your amplifier are gold plated, and we recommend premium

gold-plated plugs and high-quality shielded cable.

In most cases, the signal source will be the preamp output jacks of a tuner/deck.

Some tuner/decks use preamp output connectors other than RCA jacks, in which

case you will need a special cable or adaptor available from your dealer.

If your tuner/deck has speaker outputs and no preamp outputs, you can use the

speaker outputs.

Wire RCA-type plugs to the ends of your tuner/deck's output

wires, making sure that you maintain consistent polarity in all channels.

If you have an equalizer or low-level crossover network(s) for bi-or

tri-

amping,

these components will be inserted between your tuner/deck and your

amplifier(s).

Refer to the manuals for these components for further details.

In 4-channel mode, all four input jacks

<15),

(16>,

<26>,

and

(27)

are active

for CHANNEL A left and right and CHANNEL B left and right, respectively.

In Z-channel mode, use oniy the "right" jack

(16>

for CHANNEL A, and only the

"right" jack

(27)

for CHANNEL

In 3-channel mode, use only

rthe

"right jack for whichever of main CHANNEL A

or CHANNEL

is operating in mono, and both jacks for the other main channel.

OUTPUT CONNECTIONS

Use high-quality loudspeaker cable for best results; use 14-gauge cable as

a minimum size.

In 4-channel mode, all four terminals

<6),

(7>,

<El),

and

(9)

are active for

main CHANNEL A, and all four terminals

t17),

(18>,

<19>,

and

(20)

are active

for main CHANNEL 8.

2-channel

mode, use only the

"+"

terminals

(17)

and

(20)

for CHANNEL

The

right" terminals

(9)

and

(20)

have positive polarity in this mode.

In 3-channel mode, use only the

I'+"

terminals for whichever of main CHANNEL A

or CHANNEL B is operating in mono, and all four terminals for the other main

channel.

The terminals on your loudspeakers are marked for polarity, and loudspeaker wire

is coded by color or by markings on the jacket. Be sure to connect the left

and right channels with the same polarity. Loudspeaker manufacturers are not

consistent in their polarity markings, so if you have loudspeakers of different

types connected to the same amplifier terminal, verify correct polarity by ear.

The correct polarity produces the most bass; incorrect polarity produces

less bass and a strangely dislocated sound image on mono material.

If you have more than one amplifier: for each amplifier and its loudspeakers.

the left and right channels must always be wired with the same polarity. But

from one amplifier to the next, correct polarity may be the same, or it may be

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