BOSS MR250.4 User Manual

2

CHANNEL

4

CHANNEL

User's Manual

BRIDGEABLE

MARINE

BRIDGEABLE

MARINE

POWER

MOSFET

AMPLIFIER

MOSFET

AMPLIFIER

o~s

~

MR400.2

MR250.4

Two Channel High Marine

Four High Marine

---

Power

MOSFET

Audio

Amplifier

Channel Power

MOSFET

Audio

Amplifier

page

2

3

4

USER'S

CONTENTS

Introduction What

is

included?

Features

About 2 Ohm General

precautions

MANUAL

operation

Congratulations purchase

of

a

:lO~:S

oWIlX'n~

on

your

Marine

Amplifier.

It has been designed, engineered and manufactured the highest level

to

bring you

of

performance

and quality, and will afford you

of

years

listening pleasure.

Thank you for making

!9.~

Marine

your choice for

marine audio entertainment!

4 Protection

5 Installation

5

Fuses Mounting

6

Connecting

8

Low

level

9 High level

10

Power

2 Channel

12

Power

4 Channel

14

Troubleshooting

5

Specifications

and

Amplifier

and

Amplifier

circuitry

precautions

the

amplifier

the

amplifier

input

wiring

input

wiring

speaker

wiring

MMne

MOSFET A.rnpl1fier Us.er's Manual -

poge

1

Introduction

With the amplifier series, we are introducing two specifically for marine audio installations. This new series includes a 2-channel amplifier and a 4-channel amplifier.

All

highp;"S's and low pass crossovers. For further flexibility subwoofer. a variable bass control has been included. control the subwoofer level with the remote level control module.

These

constructed using a special corrosion resistant coating on the printed circuit board high humidity environment.

amplifiers are placed

kinds

Included help you integrate the amp into your system regardless

input source.

~~

Marine

new amplifiers, designed

iiO~S

Marine

!9~

to

prevent damage from the

~

Marine

•

of

installations, so we have also

an

models feature both

in

the use of a

Marine

of

amplifiers are

the marine

understands that

in

many different

Input sensitivity control to

of

the nature of your

MOSFET

boost You

can

What

is

included?

When first unpacking your new amplifier, please check first that the

of

package contains all below. If something

the items

is

missing, contact the store where you purchased the player.

Marine

•

HIgh

•

Four

amplifier

input

(4)

mounting

wire

with

screws

connector

Features

Your new features the following:

• Class

•

Bridgeable

•

TriMode

• MOSFET PWM (Pulse

• 2 Ohm

•

Thermal

•

Soft

•

Remote

• Variable

• Variable crossovers

• Variable

• Exclusive

PC

humidity

!9~1

A-B

operation

capable

Modulated)

stable

with

output

and

protection

turn-on

turn-on/turn-off

input

low

bass

protective

board

to

Marine

outputs

Power

stereo

power

speaker

cirCUit

gain

control

and

fixed

boost

provide damage

amplifier

Width

Supply

operation

increase

short

circuit

high

pass

(0

to

+18dB)

coating

on

from

About 2 Ohm

Your'30~S

desig'n~70

operation

Marine

amplifier has be€n

operate efficiently at loads down to 2 Ohms. This means that you can install four 8 Ohm speakers per channel,

when using parallel wiring.

Increasing the number of woofers per channel at low frequencies (below 100t-fz)

produces

an

acoustic coupling

effect. This acoustic coupling effect

by

increases your power output 3dB per speaker. or the equivalent

about

of

an additional 10W per speaker.

When operating at 2 Ohms. the amplifiers will increase their

outpul

power by approximately 50%. The

draw

will

current about

the same amount,

you have enough current to run the amplifiers into a 2 Ohm load.

also increase

so

be

by

sure

If you lack adequate current, your music reproduction will be distorted.

Manno MOSFET Ampllnlll' U

.....

s Manual - page 2

•

Gold

high

• LED indicators

• Silver

•

Remote

plated

level

power

anodized

subwoofer

RCA

inputs

and

protection

heatsink

low

level

level and

control

Mu

.....

ne

MOSFET ArnpllflOJ

User's

Manual -

pagf:!'

3

General

Before installing

3\)~

~~

tion

Please place

precautions

Marine

familiar

contained

keep

for

future

and

l/sing

amplifier,

with

a'll

in

this

manual

reference.

YO(1r

please

the

informa-

mal1ua/~

in a

new

be-

safe

• Do not open or attempt to repair this unit yourself. Dangerous high voltages are present which may result shock. Refer any repairs

In

electric

to

a qualified

service technician.

•

To

avoid risk of electronic shock or

damage to the amplifier,

of

this equipment to become damp

any

do

not permit

or wet from water or drinks. If this does occur, immediately unplug the power wires and send the amplifier to your local dealer or service center as soon as

possible.

or

• If there is smoke present during to

any

of

the component enclosures.

any peculiar odor

use

or

if there

is

damage

immediately unplug the power cord and send the amplifier to your local

or

dealer

service center

as

soon as

possible.

SHOCK HAZARD! of

this

product. voltages present within the unit. There are no user-serviceable parts

Do

not

There are dangerous

open the case

within

the unit.

Protection

Circuitry

This amplifier incorporates special

Which

protection circuitry the amplifier if any

will disable

of

the following

should occur:

• Input overload

• Short circuit

• Extremely high temperatures

Is

If any of these conditions

go

the amplifier will

into a self-

detected,

preservation mode, and the PROTECT LED on the model number badge top

of the amplifier will be illuminated.

What should I PROTECT LED

If

you observe that the PROTECT

is

on, please check the system carefully

do

if

my

is

illumInated?

amplifier

on

LED

to determine what has caused the

c1rcuit

to

protection

To

reset the amplifier when it is in

engage.

PROTECT mode, turn the power off to

by

the system (usually

turning off the head unit or other signal source which feeds the amplifier) and then turn it on again.

If the amplifier has shut down due to thermal overload. you should first allow it

to

cool down before restarting.

down

If the shut

was due

to

either

an input overload or a short circuit, be sure to correct these conditions before

to

power

up

attempting

the amplifier

again.

Installation

precautions

Before you drill or cut any holes, investigate your car's layout very

Take

carefully.

special care when you work near the gas tank, fuel lines, hydraUlic lines and electrical wiring.

Never operate the amplifier when it

is unmounted. Attach all audio system components securely within the amplifier to prevent damage, especially in

an

accident.

Do not mount this amplifier so thai wire connections are unprotected,

in

a pinched condition, in contact with

in

any metal surfaces

or

vessel,

likely to be damaged by

your marine

nearby objects.

or

Before making connections

breaking power

in

your system, disconnect the marine vessel battery. Confirm that your head unit

is

equipment

turned off while

or

other

connecting the input jacks and speaker terminals.

If you need to replace the power fuse, replace it only with a fuse identical to that supplied with the amplifier. Using a fuse of a different type or rating may result

in

damage to your audio system or your amplifier which is not covered by the manufacturer's warranty.

Fuses

Power fuses protect both the amplifier

or

car

use

rating

and the electrical system of your from fault conditions. If you must

in

replace a fuse

a fuse

of

your Marine amp,

exactly the same type and rating. Us,ng a different type of

fuse may result

amp or marine vessel

in

damage to your

or cause a fire.

Martnc MOSFET Ampllftor User's

Manual·

page 4

MarIne MOSFET Amplifier User's Manual - page 5

Mounting

1. Find a suitable location

vessel

2.

Make circulation around mounting

3.

Mark hole screws by positioning the amplifier where scribe through holes,

If

the

mounting measure with

a felt

4. Drill

surface for the mounting screws. Place the

amplifier

the

amplifier

securely uSing screws.

the

amplifier

in

the marine

in

which

to

mount

the amplifier.

sure there is sufficient air

the

intended

location.

the

location

you wish or

mounting

each

to

mark

the hole

tip

pilot

holes

to

install it. Use a

screw, inserted

of

the

amp's

the

mounting

surlace

centers

pen.

in

the

in

position,

the

mounting

for

the

is

mounting

and

mounting

carpeted, and

surlace.

mark

attach

surlace

Connecting

Before dOing this

marual

to

follow for power. connections installation. all

the connections before you proceed.

1. Connect the

to

tr.e

closest

the

marine

wire

to

less than 39" (100 em) h length.

Use

8

gauge

2.

Connect remote

output

16

gauge

3. Connect an

18" (45 em)

8 gauge (or heavier)

fuse

to

the

amplifier

<my

wiring, look through

and

identify the

input

and speaker

for

your

particular

Be

sure you

power

point

vessel. Keep

(or heavier) wire.

the remote terminal

of

(or heavier) wire.

empty

of

the car battery. and run

amplifier

understand

ground

on

the

tris

the head

fJse holder within

cable

from

location.

diagrams

terminal

chassis

ground

10

unit

uSing

this

of

the

4. Check that trfJ fuse holder is empty.

Then COllnect the fuse

"BAn

+.

connection

5.

If multip:e amplifiers are being used in

your

system, either:

holder

on

the amplifier.

to

the

6,

Connect used) using high-quality cables. Connect all speakers, this manual. polarity

7. Insert tuse(s)

holder(s).

8.

Recheck powering

9.

Sel position, controls/switches frequency

10.

Power amplifier. Then on

the and control(s) distortion.

11. Further fine tuning controls may be necessary results.

all line

inputs

following

Be

to

avoid

all

connections

up

the

all level

and

poillts.

controls

set all

up the

s~t

nead unit

adjust the amplifier's

to

just

sure

to

audio

into

the

amplifier.

crossover

to

the desired

head

the

to

about

below

the

phase

to

unit

volume

the 'level

of

and

outputs

diagrams

observe

problems.

battery

fuse

before

min,imum

and

control

3/4 volume,

input

level

the

various

to

obtain best

(if

in

proper

the

of

Don't level

Do not mistake the input level control

for a volume

ONLY

your of

Do maximum requires il.

Ignoring in and can also cause the protectiolfl circuit to

.misuse

cont:rol_!

control'

to

match

the

audio

sOurce

your

amplifier.

nol

adiust

this

unless

your

thElse

instructions will result

an input overload

excessive

.engage.

al:Jdio

the

It is

designed

output

to

the

input

level

input

to

the amplifier,

cjistortion. It

level

to

level

of

level

Marine MOSFET

Ampli~Ol

Usel'~

Manual·

page 6

pair

of

• Run a separate and

the battery to

each amplifier. Each

have its

• Run a #0

holder at the block

at Then run separate amplifier to

independent chassis ground points.

a chassis

own

inline fuse.

-or-

or

#2

battery

or

near the amplifier's location,

to

this distribution

cables

ground

(+)

cable

from the fuse

to a distribution

cables

from

block

from

pOint must

the

and

Marine MOSFET Amplifier User's

Manual·

page 7

Low

Level

Low-level (RCA) a high-quality RCA cable for best audio pertormance.

NOTE: Do receiver

2-Channel

MR400.2

Input

input

not

connect

to

your

Amplifier

Outputs

unit

Wiring

wiring is preferred

BOTH

amplifier

To

Audio

of

or

signal

processor

at

head

the

high

same

for

best audio performance, Always use

!evel

and

time!

low

level

inputs

Optlonnl

ulJwoofer

(sold

from

remote

level conlrQI

~epamtelvl

your

,

J

High

Level

The high level input(s) should only be used when your head unit lacks RCA outputs, If the RCA to the high level input avoid audio phase problems,

NOTE: Do receiver

2-Channel

MR400.2

Input

outputs

to

not

your

are

connect

amplifier

Amplifier

l+

IObO;;;:;z;x::)

To

Speaker

Wiring

not

present, connect

connector

BOTH

at

the

1"'"'

-----"

l~

R· R

...

I

Terminals

of

head

unit

the

speaker outputs from the receiiver

of the amplifier. Be sure

the

high

level

and

low

same

timet

7

to

observe polarity to

level

inputs

from

Optional

ubwoofcr

(sold separately)

remote

lellel

contro

your

4-Channel

MR250.4

TO FRONT

Ma"ne

MOSFET

Amplifiers

Audio

of

head

signal

processor

AmpRfier

Outputs

unit

or

User's Manual·

10l:=J I

p8ij8

8

To

REAR

Optlonal

"ubwoofer

(sold separately)

Audio

Outputs

headl

signal

processor

unil

remote

level

of or

control

'\

!

4-Channel

MR250.4

@

Amplifier

To

Speaker

Terminals

of

head

unit

~~

c.;:

I

01

1::Ic:::JCJC:::lt::lO

;~

[]

~

Marlne MOSFET Amplifier User"s

(1])

Optlonlll

subwooler

(sold se!l"arately)

remote

level

(

control

Manual"

page

9

Power

and

I

Speaker

Wiring

2-Channel

Amplifier

MR400.2

Power

and

Speaker

Wiring

2·,Chanhel

Amplifie!i

"'11400.2

Two

Channel

Mode

ttl

Speaker

R.IGHT

Speaker

Bridged Mode

ttl

Q

LEFT

Q

~

Ch.a;sls

ground

point

FUSE

POW,liR

to

REMOTE

18111'1

inal

o

CJ

I

Batlery

~I,.o,ll£l'n

Q

TURN-ON

0 r

head u ni

c::J

I

Tri-mode operation allows you to connect this amplifier to a

of

plus a sUlbwoofer on one pair

in

STEREO while the subwoofer simultaneously operates

To

set up the amplifier to run

position. Insert

$

wiring as determine the correct capacitor ar.d inductor values for the crossover frequency you wish

h'igh

pass filter capacitors and a

shown

below. Be sure to check the table at the bottom

10 achieve,

output channels. The main speakers will operate

In

this mode, put the crossover switch in the

low

pass fliller -nditJctor into the

pair-

In

MONO.

of

main speakers

FULL

of

this page

to

Tri-Mode

l

LEFT

Speaker

MINIMUM

SPEAKER

IMPEOANCE

4 OHMS

$

Q

ttl

HIgh

pass

capacitors

./'

Lowpass

filter Inductor

filter

RIGHT

~

SP'EAKER

IMPEDANCE

80HMS

Spaaker

MINIMUM

SPEAKER

IMPEDANCE

40HMS

Chassl$

groUf'ld

point

to

tennlnal

FUSE I

poweA

Q

REMOTE

01

o

c::::I

Ba

tte

TURN-ON

head

c::J

ry

I

Et7

unit

SUBWOOFER

SPEAKER

IMPEDANCE

4-8 OHMS

Marino MOSFET Amplifier

Connecr the Negmive (-)

of

1M

terminal R(-)

amplifier

COnnec! terminal ofthe spooker 10 !he L(+)

amplifier

Users

speaker to

terminal.

the posJtlve (+)

terminal.

Manual - page

10

/he

Cha'"ssis

ground

point

FUSE

to 'REMOTE

torm

lnal

of I'cad

o

c::J

I

Battery

TllRN·ON

CJ

I

unIt

Component

6dB

Passive

FREQUENCY INDUCTOR CAPACITOR 80 Hz

tOO

Hz

120 Hz

t50

Hz

values

Crossover

7.5mH

6.5mH

5.5mH 4mH

for

470uF

330uF 330uF 220uF

Marine

MOsFET

AmplirJel USB(S

Manual-

page

11

Power

h

SPEAKER

IMPEDANCE

4-8 OHMS

atidged Mode

and

Speaker

CH4

Speaker

RIGHT

Subwooler

CH3

Sponker

Wiring

4-Channel

Amplifier

MR250.4

Chassl.

ground

polnt

to

REMOTE TURN'ON

terminal

ot head unit

o

FUSE

Connect rile Negative subwoofer to the CH4(-) amplifier tarmlnal.

Connact lhe Postive subwoofer 10 the CH3(+) amplifIer terminal.

(+)

(-J

terminal

l~atte~1

of

Ihe RIGHT

of

!he RIGH

E:t)

Power

and

Speaker

Wiring

4-Channel

Amplifier

MR250.4

Tri-mode operation allows you to connect this amplifier to a pair of main speakers plus a subwoofer in

STEREO

To

set up the amplifier to run

on one pair of output channels. The main speakers will operate

while the subwoofer simultaneously operates in MONO.

In

this mode, put the crossover switches

in

the FULL position. Insert high pass filter capacitors and a low pass filter inductor into the wiring as shown below.

Be

sure to check the table

at

the bottom

of

this page to determine the correct capacitor and Inductor values for the crossover frequency you wish to achieve.

Tri~Mode

SPEAKER

IMPEOANCE

80HMS

Component 6dB

Passive

FREOUENCY INDUCTOR CAPACrrOR

80 Hz

100 Hz

120 Hz 150 Hz

FUSE

values

Crossover

7.5mH

6.5mH

5.5mH

4/111-1

o

o 0

I

Battery

lo

REMOTE

term!nal

for

470uF 330uF 330uF 220uF

I

nJRN-QN

of

head

unit

E:t)

LEFT

Subwoofer

Connecllhe subwoofer

SPEAKER

IMPEDANCE

4-8 OHMS

Mmine MOSFET Amplifier User's Manual -

Connect the Pos/lVa

subwoofer

Negative

(-J

terminal

10

the CH2(·) amplifier terminal.

(+)

10

the

CH1(+J

page'

of

terminal

of

amplifier tarmlfl8.l.

2

rhe LEFT

the

LEfT

Chnssfs

ground

FUSE

o

poln!

10

REMOTE TURN·ON

terminal

o

D

I

Battery

01

head unit

c::J

I

SPEAKER

IMPEDANCE

80HMS

elli

••

ls

ground

point

MINIMU

SPEAKER

IMPEDANCE

40HM9

Marino MOSFET Amplltier User's Manual - P'lIIe

13

Troubleshooting

If

you experience operation or perionnance problems with this product, compare your installation with the electrical wiring diagram read the following troubleshooting tips which may help eliminate the problems.

SYMPTOM

Amplifier

power

up.

Protection comes

on amplifier powered

No

output.

Low

output.

Audio

present

only

one

High

hiss

speakers.

Squealing from

speakers.

Distorted

Amplifier

very

hot.

Engine (static

Engine

noise

type)

noise

(alternator

whine)

will

not

LE.D

when

is

up.

in

channel.

in

the

noise

sound.

gets

POSSIBLE

Check to make sure you have a Check that the Remote Input (Tum-On) has Check that there Check that there Check all fuses, replace If necessary. Make sure that the Protection LED ls not illuminated. If It

the amplifier briefly. Check for

Tum Remote speaker leads, and reset the amplifier.

comes

Check that all fuses are Check that amplifier Is properly grounded. Check thaI the Remote Input (Tum·

Check that the RCA audio cables are Check all speaker wiring,

Reset the Level Control.

Check the Crossover Control settings. Check the RCA Interconnect cables.

Check all speaker Disconnect all RCA Inputs to the amplifiers,

plug

hiss disappears

found. It

IS

best

the head unit

level

Check for improperly grounded RCA Interconnects,

Check that the Input Level head unit. Always try to set the Input Lavel

Clleck that all crossover frequencies Check

CllfICk that the minimum speaker Impedance Check thaI there

applications,

This

radiated nOise. from

Check that speaker leads are Check that the RCA grounds are not shorted to the marine vessel chassis. Check that the head unit

REMEDY

short

down the volume control on the head umt to prevent overdrlving.

on, then the ampllfTer Is faulty and needs servicing,

in the component

to

set the amplifier's Input level control

sUbjective s/gna/-to-noise ratio is achieved

as

low as possIble.

for

short

it

is

usually

power

cables

on

the previous pages.

good

ground connection.

Is battery

Is

clrcwts on speaker leads.

a/

high

circuits on the speaker leads.

is

may

caused

Use

power

on the

at least

12v.

and

(hen repower

OK.

Wiring.

dn"vmg

this point.

8S

possible (I¥/lhout distortion)

Contrails

good

air circulatJon around the amp. In some

be

necessary to

by

poor

only the best quality cables.

is

properly grounded.

It.

On)

has

plugged

the amplifier

go

on until the faulty/noisy component is

set

are properly set.

add

quality RCA cables. which can

not

shorted to the man'ne vessel chassis.

If

problems persist,

at

least 3VDC.

(+)

terminal.

Is

If the Protection LED

at

least 3VDC.

into the proper Inputs.

It

the hiss disappears, thel

and

unplug Its Inputs. If

as

low as possible.

In

this manner.

and

the

to

match the signal level

as

low

as possIble.

tor

the amp model Is correct.

and

extemal cooling

and

route them

lit. shut

Try

amp

fan.

pick

off

stil,

thE

Th

/0

Inpu

of

the

up

away

Specifications

Two

Chllnnel

MarIne

Amplifier

MODEL

I\M$

POWER

into 4 Ohm5

'MAX

POWER

into 2 Ohms

BRIOGE.O

Into 4 Ohms

Min.

,impedance

POWER

speak·e.

THO

Frequency

Sl~na!·to-noi$e

Channel Damping Crossover

low pa••

[high

[Bass

IFuse i{;lil1lenslorfS:

(1,

1·3/4"

e

s

t

pass

Ibo'ost

rating

response

separation

factor

range

X 2-518;1

r

...

tio

l<

...

MR400.2

125W

400W x 2

SOOW

2 Ohm Stereo/4 Ohm

0.01% 6Hz-50kHz 103dB

90dS

125+

35HZ-155Hz 200Hz (fixed)

0-

+1SdS

25A

x

10-31S'

)

x2

x 1

Mono

Bridged

Four Chenn'1l Marine

MR.250.

100Wx4 250W x 4

500W

------

0.01% 6Hz-50kHz

103dB

gOdS

125+

35Hz.-155Hz 200Hz (fixed)

o

-+18dS

15Ax2

13-1116'

All

AmplifIer

x2

specifications

change

without

subject

notice.

to

Maline MOSFET Amplifier

U..,,'.

Manual - p3ge

14

Marine MOSFET Amplifier

User'.

Manual·

page

15

BOSS MR250.4 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual