Pioneer Gm-x554 Sm

PIONEER CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.PIONEER EUROPE N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936

C PIONEER CORPORATION 2000 K-ZZS. NOV. 2000 Printed in Japan

ORDER NO.

CRT2613

BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER

GM-X554 X1R/UC

ServiceManual

GM-X554/X1R/EW

CONTENTS

1. SAFETY INFORMATION............................................2

2. EXPLODED VIEWS AND PARTS LIST ......................2

3. SCHEMATIC DIAGRAM.............................................6

4. PCB CONNECTION DIAGRAM................................12

5. ELECTRICAL PARTS LIST........................................16

6. ADJUSTMENT.........................................................19

7. GENERAL INFORMATION.......................................20

7.1 DISASSEMBLY ..................................................20

8. OPERATIONS AND SPECIFICATIONS....................21

GM-X554 X1R/EW

GM-X554 X1R/ES

2

GM-X554

2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

1. SAFETY INFORMATION

- GM-X554/X1R/UC

CAUTION

This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repaircomplex products such as those covered by this manual.Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.If you are not qualified to perform the repair of this product properly and safely; you should not risk trying to do soand refer the repair to a qualified service technician.

WARNING

This product contains lead in solder and certain electrical parts contain chemicals which are known to the state ofCalifornia to cause cancer, birth defects or other reproductive harm. Health & Safety Code Section 25249.6 - Proposition 65

3

GM-X554

NOTE:

- Parts marked by “*” are generally unavailable because they are not in our Master Spare Parts List.

- Screws adjacent to ∇ mark on the product are used for disassembly.

- Owner's ManualModel Part No. Language

GM-X554/X1R/UC HRD0167 English, FrenchGM-X554/X1R/EW HRD0159 English, Spanish, German,

French, Italian, DutchGM-X554/X1R/ES HRD0168 English, Spanish

HRD0174 Portuguese(B), Arabic

- PACKING SECTION PARTS LISTPart No.

Mark No. Description GM-X554/X1R/UC GM-X554/X1R/EW GM-X554/X1R/ES* 1-1 Warranty Card Not used HRY1157 Not used

1-2 Owner’s Manual HRD0167 HRD0159 HRD01681-3 Owner’s Manual Not used Not used HRD0174

* 1-4 Card ARY1048 Not used Not used2 Screw BYC40P180FZK BYC40P180FZK BYC40P180FZK

3 Polyethylene Bag HEG0011 HEG0011 HEG00114 Polyethylene Bag HEG0022 HEG0022 HEG00225 Carton HHG0281 HHG0281 HHG02816 Contain Box HHL0281 HHL0281 HHL02817 Protector HHP0107 HHP0107 HHP0107

8 Cover HNS0101 HNS0101 HNS0101

4

GM-X554

2.2 EXTERIOR

A

5

GM-X554

(1) EXTERIOR SECTION PARTS LIST

Mark No. Description Part No. Mark No. Description Part No.1 Screw BBZ30P050FMC2 Screw BBZ30P060FMC3 Screw BBZ30P080FMC4 Screw BSZ30P050FZK5 Screw(M3x12) CBA1323

6 Screw(M3x5) HBA00067 Screw(M3x8) HBA00118 Panel See Contrast table(2)9 Case HNB0134

10 Panel See Contrast table(2)

11 Holder HNC008012 Heat Sink See Contrast table(2)13 Cover HNS010114 Spacer HNV001615 Amp Unit See Contrast table(2)

16 Terminal(CN604) CKF105917 Fuse(20A) HEK002018 Pin Jack(CN852) HKB000219 Pin Jack(CN851) HKB000620 Terminal(CN601) HKE0020

21 Connector(CN301) HKE003022 Clip HNC005423 Holder HNC008224 Screw PPZ30P100SAD25 Light Pipe Unit HXA0322

26 Screw PPZ30P100FZK

(2) CONTRAST TABLE

GM-X554/X1R/UC, EW and ES are constructed the same except for the following:Part No.

Mark No. Description GM-X554/X1R/UC GM-X554/X1R/EW GM-X554/X1R/ES8 Panel HNB0128 HNB0147 HNB0128

10 Panel HNB0136 HNB0142 HNB013612 Heat Sink HNR0181 HNR0187 HNR018115 Amp Unit HWH0148 HWH0147 HWH0149

OUTPUT L

OUTPUT R

INPUT SELECT

ISOLATORGAIN = 1

HP/LP FILTER40 - 120Hz 12dB/OCTAVE HP/LP FILTER

BFC

±25VREGULATOR

V

V

(EW,ES model)DC/DC CONVERTER

6

GM-X554

A

1 2 3 4

B

C

D

1 2 3 4

A-a A-b

A-aA-a A-b A-b

A-b A-b A-a A-a

Large sizeSCH diagram

Guide page

Detailed page

3. SCHEMATIC DIAGRAM

3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)

Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS

LIST”. A-a

A

GAIN

POWER AMP

AMP GAIN = 7 - 31dB

POWER CONTROL /

MUTE

AMP UNITA

7

GM-X5545 6 7 8

A

B

C

D

5 6 7 8

A-b

A

8

GM-X554

A

1 2 3 4

B

C

D

1 2 3 4

OU

TP

UT

L

OU

TP

UT

R

INP

UT

SE

LEC

T

ISO

LAT

OR

GA

IN =

1

HP

/LP

FIL

TE

R40

- 1

20H

z 12

dB

/OC

TA

VE

HP

/LP

FIL

TE

R

V VA-a

A-b

A-a

9

GM-X5545 6 7 8

A

B

C

D

5 6 7 8

BFC

±25V

RE

GU

LAT

OR

(EW

,ES

mo

del

)D

C/D

C C

ON

VE

RT

ER

A-a

A-b

A-a

10

GM-X554

A

1 2 3 4

B

C

D

1 2 3 4

GA

IN

PO

WE

R A

MP

AM

P G

AIN

= 7

- 3

1dB

AM

P U

NIT

A

A-a

A-b

A-b

11

GM-X5545 6 7 8

A

B

C

D

5 6 7 8

PO

WE

R

CO

NT

RO

L /

MU

TE

A-a

A-b

A-b

12

GM-X554

A

1 2 3 4

B

C

D

1 2 3 4

AMP UNIT

4. PCB CONNECTION DIAGRAM

4.1 AMP UNIT

NOTE FOR PCB DIAGRAMS

1. The parts mounted on this PCB

include all necessary parts for

several destination.

For further information for

respective destinations, be sure

to check with the schematic

diagram.

2. Viewpoint of PCB diagrams

CapacitorConnector

P.C.Board Chip Part

SIDE A

SIDE B

A

LPF/HPFSELECT

FREQ

OUTPUT

INPUT A

INPUT B

GAIN

L R

INPUTSELECT

FREQ

LPF/HPFSELECT

GAIN

A

13

GM-X5545 6 7 8

A

B

C

D

5 6 7 8

FUSE

BFC

SIDE A

A

14

GM-X554

A

1 2 3 4

B

C

D

1 2 3 4

POWER

A AMP UNIT

A

15

GM-X5545 6 7 8

A

B

C

D

5 6 7 8

SIDE B

WER

A

16

GM-X554

Q 336 Transistor 2SD2438Q 337 Transistor 2SB1587Q 338 Transistor 2SB1587Q 339 Transistor 2SB1587Q 340 Transistor 2SB1587

Q 601 Transistor 2SC2458Q 602 Transistor 2SA1048Q 603 Transistor 2SB1243Q 604 Transistor 2SA1048Q 606 Transistor 2SD1919

Q 607 Transistor 2SD1919Q 608 Transistor 2SB1277Q 609 Transistor 2SB1277Q 610 FET STP55NE06FPQ 611 FET STP55NE06FP

Q 612 FET STP55NE06FPQ 613 FET STP55NE06FPQ 614 FET STP55NE06FPQ 615 FET STP55NE06FPQ 616 Transistor 2SD2395

Q 617 Transistor 2SB1566Q 901 Transistor 2SD1768SQ 902 Transistor 2SD1768SQ 903 Transistor 2SD1768SQ 904 Transistor 2SD1768S

Q 905 Transistor 2SA1048Q 906 Transistor 2SC2458Q 907 Transistor 2SC2458Q 908 Transistor 2SC2458Q 909 Transistor 2SA1048

D 305 Diode 1SS133D 306 Diode 1SS133D 307 Diode 1SS133D 308 Diode 1SS133D 309 Diode 1SS133

D 310 Diode 1SS133D 311 Diode 1SS133D 312 Diode 1SS133D 601 Diode RM4ZD 602 Diode HZS7L(B2)

D 603 Diode 1SS133D 606 Diode 1SS133D 607 Diode 1SS133D 610 Diode FML22RD 611 Diode FML22S

D 612 Diode HZS16L(1)D 613 Diode HZS16L(1)D 662 Diode ERA15-02VHD 663 Diode ERA15-02VHD 901 Diode 1SS133

D 902 Diode 1SS133D 903 Diode 1SS133D 904 Diode 1SS133D 909 Diode 1SS133D 910 LED SML210LT(LMN)

5. ELECTRICAL PARTS LIST

NOTE:

- Parts whose parts numbers are omitted are subject to being not supplied.

- The part numbers shown below indicate chip components.

Chip Resistor

RS1/_S___J,RS1/__S___J

Chip Capacitor (except for CQS.....)

CKS....., CCS....., CSZS.....

Unit Number : HWH0148(GM-X554/X1R/UC): HWH0147(GM-X554/X1R/EW): HWH0149(GM-X554/X1R/ES)

Unit Name : Amp Unit

MISCELLANEOUS

IC 121 IC NJM2068DIC 122 IC NJM2068DIC 123 IC NJM2068DIC 124 IC NJM2068DIC 125 IC NJM2068D

IC 126 IC NJM2068DIC 127 IC NJM2068DIC 128 IC NJM2068DIC 601 IC PA2027AIC 602 IC UPC494C

IC 851 IC NJM2068DIC 852 IC NJM2068DIC 853 IC NJM2068DIC 854 IC NJM2068DQ 201 Transistor 2SC2458

Q 202 Transistor 2SC2458Q 203 Transistor 2SC2458Q 204 Transistor 2SC2458Q 207 Transistor 2SA1048Q 301 Transistor 2SA992

Q 302 Transistor 2SA992Q 303 Transistor 2SA992Q 304 Transistor 2SA992Q 305 Transistor 2SA992Q 306 Transistor 2SA992

Q 307 Transistor 2SA992Q 308 Transistor 2SA992Q 309 Transistor 2SC5168Q 310 Transistor 2SC5168Q 311 Transistor 2SC5168

Q 312 Transistor 2SC5168Q 317 Transistor 2SC1845Q 318 Transistor 2SC1845Q 319 Transistor 2SC1845Q 320 Transistor 2SC1845

Q 321 Transistor 2SA992Q 322 Transistor 2SA992Q 323 Transistor 2SA992Q 324 Transistor 2SA992Q 325 Transistor 2SC1845

Q 326 Transistor 2SC1845Q 327 Transistor 2SC1845Q 328 Transistor 2SC1845Q 329 Transistor 2SC1845Q 330 Transistor 2SC1845

Q 331 Transistor 2SC1845Q 332 Transistor 2SC1845Q 333 Transistor 2SD2438Q 334 Transistor 2SD2438Q 335 Transistor 2SD2438

=====Circuit Symbol and No.===Part Name Part No.--- ------ ------------------------------------------ -------------------------


A

17

GM-X554

L 851 Ferri-Inductor CTF1007L 852 Ferri-Inductor CTF1007L 853 Ferri-Inductor CTF1007L 854 Ferri-Inductor CTF1007T 601 Transformer HTT0014

TH 601 Thermistor CCX1013TH 602 Thermistor CCX1013TH 603 Thermistor CCX1035S 101 Switch(LPF/HPF SELECT) CSH1029S 102 Switch(LPF/HPF SELECT) CSH1029

S 601 Switch(BFC)(EW,ES model) HSH-156-S 851 Switch(INPUT SELECT) CSH1042VR 121 20kΩ(E) CCS1266VR 122 20kΩ(E) CCS1266VR 201 10kΩ(A) CCS1265

VR 202 10kΩ(A) CCS1265Fuse 20A HEK0020

RESISTORS

R 101 RS1/10S103JR 102 RS1/10S103JR 103 RS1/10S103JR 104 RS1/10S103JR 105 RS1/10S103J








R 201 RD1/4PU472JR 202 RD1/4PU472JR 203 RD1/4PU472JR 204 RD1/4PU472JR 207 RD1/4PU223J














R 369 RD1/4PU100JR 370 RD1/4PU100JR 371 RD1/4PU100JR 372 RD1/4PU100JR 377 0.22Ω CCN1013

R 378 0.22Ω CCN1013R 379 0.22Ω CCN1013R 380 0.22Ω CCN1013R 381 0.22Ω CCN1013R 382 0.22Ω CCN1013



18

GM-X554



R 393 RS1/2PMF100JR 394 RS1/2PMF100JR 395 RS1/2PMF100JR 396 RS1/2PMF100JR 601 RD1/4PU102J



R 612 RD1/4PU101JR 613 RD1/4PU221JR 614 RD1/4PU102JR 616 RS1/10S101JR 617 RS1/10S103J


R 623 (EW,ES model) RD1/4PU105JR 625 RD1/4PU332JR 626 RD1/4PU332JR 627 RS1/10S472JR 628 RS1/10S472J

R 629 RD1/4PU272JR 630 RD1/4PU272JR 631 RD1/4PU272JR 632 RS1/10S472JR 633 RS1/2PMF121J

R 634 RS1/2PMF121JR 635 RD1/4PU472JR 636 RD1/4PU472JR 637 RS1/2PMF121JR 638 RS1/2PMF121J

R 639 RS1/2PMF121JR 640 RS1/2PMF121JR 641 RS1/2PMF100JR 642 RS1/2PMF100JR 643 RS1/2PMF220J

R 645 RS1/2PMF100JR 646 RS1/2PMF100JR 647 RD1/4PU472JR 648 RD1/4PU472JR 650 RD1/4PU104J



R 856 RS1/10S223JR 857 RS1/10S223JR 858 RS1/10S223JR 859 RN1/10SE1002DR 860 RN1/10SE1002D

R 861 RN1/10SE1002DR 862 RN1/10SE1002DR 863 RN1/10SE1002DR 864 RN1/10SE1002DR 865 RN1/10SE1002D

R 866 RN1/10SE1002DR 871 RN1/10SE1002DR 872 RN1/10SE1002DR 873 RN1/10SE1002DR 874 RN1/10SE1002D

R 875 RN1/10SE1002DR 876 RN1/10SE1002DR 877 RN1/10SE1002DR 878 RN1/10SE1002DR 901 RD1/4PU473J





R 931 RD1/4PU331J

CAPACITORS

C 101 CCSQCH470J50C 102 CCSQCH470J50C 103 CCSQCH470J50C 104 CCSQCH470J50C 105 CFTLA154J50

C 106 CFTLA154J50C 107 CFTLA154J50C 108 CFTLA154J50C 109 CFTLA154J50C 110 CFTLA154J50

C 111 CFTLA154J50C 112 CFTLA154J50C 301 CEAS100M16C 302 CEAS100M16C 303 CEAS100M16



19

GM-X554



C 304 CEAS100M16C 305 CKPUYB101K50C 306 CKPUYB101K50C 307 CKPUYB101K50C 308 CKPUYB101K50

C 309 CQMA471J50C 310 CQMA471J50C 311 CQMA471J50C 312 CQMA471J50C 317 CEAS101M10

C 318 CEAS101M10C 319 CEAS101M10C 320 CEAS101M10C 321 CCCCH220J100C 322 CCCCH220J100

C 323 CCCCH220J100C 324 CCCCH220J100C 325 CCCCH100J100C 326 CCCCH100J100C 327 CCCCH100J100

C 328 CCCCH100J100C 329 CFTLA223J50C 330 CFTLA223J50C 331 CFTLA223J50C 332 CFTLA223J50

C 337 CCCCH100J100C 338 CCCCH100J100C 339 CCCCH100J100C 340 CCCCH100J100C 341 CCCCH100J100

C 342 CCCCH100J100C 343 CCCCH100J100C 344 CCCCH100J100C 345 CFTLA333J50C 346 CFTLA333J50

C 347 CFTLA333J50C 348 CFTLA333J50C 349 CQMA102J50C 350 CQMA102J50C 351 CQMA102J50

C 352 CQMA102J50C 601 CFTLA103J50C 602 CFTNA224J50C 603 CFTLA103J50C 604 CFTLA103J50

C 605 CFTLA103J50C 606 CFTLA103J50C 607 CEAS100M16C 608 CEAS100M16C 609 CEAS101M16

C 611 CEAS220M50C 612 470µF/16V CCH1183C 613 CFTLA103J50C 614 CFTLA103J50C 615 CEAS100M16

C 616 CEAS221M10C 617 CQMA102J50C 618 CFTLA105J50C 619 CEAS470M50C 620 CQMA472J50

C 621 CQMA472J50C 623 3300µF/16V HCH0005C 624 3300µF/16V HCH0005C 625 CQMA102J50C 626 3300µF/35V HCH0006

C 627 3300µF/35V HCH0006C 628 3300µF/35V HCH0006C 629 3300µF/35V HCH0006C 631 CEAS471M35C 632 CEAS471M35

C 633 CEASR10M50C 634 CEASR10M50C 635 CEAS470M50C 636 CEAS470M50C 637 CFTLA103J50

C 638 CFTLA103J50C 639 CCG-081C 640 CCG-081C 641 CFTLA564J50C 851 CEAS100M16

C 852 CEAS100M16C 853 CEAS100M16C 854 CEAS100M16C 855 CQMA472J50C 856 CQMA472J50

C 857 CQMA472J50C 858 CQMA472J50C 859 CCSQCH470J50C 860 CCSQCH470J50C 861 CCSQCH470J50

C 862 CCSQCH470J50C 863 CCSQCH470J50C 864 CCSQCH470J50C 865 CCSQCH470J50C 866 CCSQCH470J50

C 875 CKPUYB471K50C 876 CKPUYB471K50C 877 CKPUYB471K50C 878 CKPUYB471K50C 901 220µF/10V CCH1036

6. ADJUSTMENT

There is no information to be shown in this chapter.

20

GM-X554

7. GENERAL INFORMATION

7.1 DISASSEMBLY

Case

Fig.1

- Removing the Case and the Panel (Fig.1)

Remove the four screws.

Remove the two screws.

Remove the three screws and then remove

the Case.

Remove the six screws and then remove the

Panel.

Fig.2

Panel

- Removing the Amp Unit (Fig.2)

Remove the twenty-four screws.

Remove the two screws.

Remove the twelve screws and then remove

the Amp Unit.

Amp Unit

21

GM-X554

8. OPERATIONS AND SPECIFICATIONS

8.1 OPERATIONS

- GM-X554/X1R/EW

22

GM-X554

Pow

er In

dica

tor

The

pow

er in

dica

tor

light

s w

hen

the

pow

er is

sw

itche

d on

.

BFC

(Bea

t Fre

quen

cy C

ontro

l) Sw

itch

If y

ou h

ear

a be

at w

hile

list

enin

g to

an

MW

/LW

bro

adca

st w

ith y

our

car

ster

eo,

chan

ge th

e B

FC s

witc

h us

ing

a sm

all

stan

dard

tip

scre

wdr

iver

.(G

M-X

554/

X1R

/EW

,ES)

LPF

(Low

-Pas

s Fi

lter)/

HPF

(Hig

h-Pa

ss F

ilter

) Sel

ect S

witc

hSe

t the

LPF

/HPF

sel

ect s

witc

h as

fol

low

s ac

cord

ing

to th

e ty

pe o

f sp

eake

r th

at is

con

nect

edto

the

spea

ker

outp

ut c

onne

ctor

and

the

car

ster

eo s

yste

m:

LP

F/H

PF

Sel

ect

Aud

io f

requ

ency

ran

geSp

eake

rR

emar

ks

Swit

chto

be

outp

utT

ype

LPF

(Lef

t)*

— 4

0 to

120

Hz

Subw

oofe

rC

onne

ct a

sub

woo

fer.

OFF

(Cen

ter)

Full

rang

eFu

ll ra

nge

HPF

(R

ight

)*

40 to

120

Hz

—Fu

ll ra

nge

Use

if y

ou w

ant t

o cu

t the

ve

ry lo

w f

requ

ency

ran

ge*

beca

use

it is

not

nec

essa

ry

for

the

spea

kers

you

are

us

ing.

*Se

e th

e “C

ut O

ff F

requ

ency

Con

trol

” se

ctio

n.

Setti

ng th

e U

nit

Gai

n Co

ntro

lA

djus

ting

the

gain

con

trol

s A

and

B w

illhe

lp m

atch

the

outp

ut o

f th

e ca

r st

ereo

to th

e Pi

onee

r am

plif

ier.

Nor

mal

ly, s

etth

e ga

in c

ontr

ols

to th

e “N

OR

MA

L”

posi

tion.

If

the

outp

ut is

low

, eve

n w

hen

the

volu

me

of th

e ca

r st

ereo

is tu

rned

up, t

urn

thes

e co

ntro

ls c

lock

wis

e. I

fth

ere

is d

isto

rtio

n w

hen

the

volu

me

ofth

e ca

r st

ereo

is tu

rned

up,

turn

thes

eco

ntro

ls c

ount

er-c

lock

wis

e.•

If y

ou o

nly

use

one

inpu

t plu

g, s

et th

e ga

inco

ntro

ls f

or s

peak

er o

utpu

ts A

and

B to

the

sam

e po

sitio

n.•

Whe

n us

ing

with

an

RC

A e

quip

ped

car

ster

eo (

stan

dard

out

put o

f 50

0 m

V),

set

toth

e N

OR

MA

L p

ositi

on. W

hen

usin

g w

ithan

RC

A e

quip

ped

Pion

eer

car

ster

eo w

ithm

ax. o

utpu

t of

4 V

or

mor

e, a

djus

t lev

el to

mat

ch th

e ca

r st

ereo

out

put l

evel

.

Cut O

ff Fr

eque

ncy

Cont

rol

If th

e L

PF/H

PF s

elec

t sw

itch

is s

et to

LPF

or

HPF

, you

can

sel

ect a

cut

off

freq

uenc

y fr

om 4

0 to

120

Hz.

Inpu

t Sel

ect S

witc

hFo

r tw

o-ch

anne

l inp

ut, s

lide

this

sw

itch

to th

e le

ft. F

or f

our-

chan

nel i

nput

, slid

eth

is s

witc

h to

the

righ

t.

23

GM-X554

Connection Diagram

Grommet

RCA input

Special red battery wire [RD-223] (sold separately)After making all other connections at the amplifier,connect the battery wire terminal of the amplifier tothe positive (+) terminal of the battery.

Ground wire (Black) [RD-223] (sold separately)Connect to metal body or chassis.

Amplifier withRCA input jacks

Car stereo withRCA output jacks

System remote control wire (sold separately)Connect the male terminal of this wire to the system remote controlterminal of the car stereo (SYSTEM REMOTE CONTROL). The femaleterminal can be connected to the auto-antenna relay control terminal. If thecar stereo does not have a system remote control terminal, connect themale terminal to the power terminal through the ignition switch.

Fuse (30 A)

Fuse (30 A)

Connecting wires with RCA pinplugs (sold separately).

Connecting wires with RCA pinplugs (sold separately).

Speaker terminal

Fuse (20 A) × 2

External OutputIf only one input plug is used, do notconnect anything to RCA input jack B.

RCA input jack BRCA output jack

Front side

RCA input jack A

Back side

Input Select SwitchFor two-channel input, slide this switchto the left. For four-channel input, slidethis switch to the right.

24

GM-X554

8.2 SPECIFICATIONS

- GM-X554/X1R/UCPower source ........................................................................ 14.4 V DC (10.8 — 15.1 V allowable)Grounding system .................................................................................................... Negative typeCurrent consumption .............................................................. 27.1 A (at continuous power, 4 Ω)Idle current ...................................................................................................................... 4 — 25 mA Average current drawn* .................................................................. 9.1 A (4 Ω for four channels)

.................................................................................................... 14.5 A (4 Ω for two channels)Fuse ...................................................................................................................................... 20 A x 2Dimensions .................................................................................... 279 (W) x 58 (H) x 324 (D) mm

.............................................................................................. [11 (W) x 2-1/4 (H) x 12-3/4 (D) in]Weight ................................................................ 4.8 kg (10.6 lbs) (Leads for wiring not included)Maximum power output .............................................................................. 100 W x 4 / 240 W x 2Continuous power output ........................ 50 W x 4 (at 14.4 V, 4 Ω, 20 — 20,000 Hz, 0.08% THD)

.............................................................. 120 W x 2 (at 14.4 V, 4 Ω, 20 — 20,000 Hz, 0.8% THD)

................................................................ 60 W x 4 (at 14.4 V, 2 Ω, 20 — 20,000 Hz, 0.8% THD)Load impedance ........................................................................................ 4 Ω (2 — 8 Ω allowable)

.................................................................................... (Bridge connection: 4 — 8 Ω allowable)Frequency response ...................................................................... 10 — 50,000 Hz (+0 dB, –1 dB)Signal-to-noise ratio ................................................................................ 100 dB (IHF–A network)Distortion ........................................................................................................ 0.008% (10 W, 1 kHz)Separation .................................................................................................................. 65 dB (1 kHz)Low pass filter .............................................................................. Cut off frequency: 40 — 120 Hz

............................................................................................................ Cut off slope: –12 dB/octHigh pass filter .............................................................................. Cut off frequency: 40 — 120 Hz

............................................................................................................ Cut off slope: –12 dB/octMaximum input level/impedance ................................................ RCA: 6.5 V/22 kΩ (0.4 — 6.5 V)Note:• Specifications and the design are subject to possible modification without notice due to

improvements.*Average current drawn• The average current drawn is nearly the maximum current drawn by this unit when an

audio signal is input. Use this value when working out total current drawn by multiplepower amplifiers.

- GM-X554X1R/EWPower source .......................................................................... 14.4 V DC (10.8 — 15.1 V allowable)Grounding system ...................................................................................................... Negative typeCurrent consumption ................................................................ 27.1 A (at continuous power, 4 Ω)Idle current ...................................................................................................................... 4 — 25 mA Average current drawn* .................................................................... 9.1 A (4 Ω for four channels)

...................................................................................................... 14.5 A (4 Ω for two channels)Fuse ...................................................................................................................................... 20 A x 2Dimensions ...................................................................................... 279 (W) x 58 (H) x 324 (D) mmWeight .................................................................................. 4.8 kg (Leads for wiring not included)Maximum power output .............................................................................. 100 W x 4 / 240 W x 2Continuous power output ........................................ 75 W x 4 / 200 W x 2 (DIN45324, +B=14.4 V)Load impedance ........................................................................................ 4 Ω (2 — 8 Ω allowable)

.................................................................................... (Bridge connection: 4 — 8 Ω allowable)Frequency response ........................................................................ 10 — 50,000 Hz (+0 dB, –1 dB)Signal-to-noise ratio .................................................................................. 100 dB (IEC-A network)Distortion ........................................................................................................ 0.008% (10 W, 1 kHz)Separation .................................................................................................................... 65 dB (1 kHz)Low pass filter ................................................................................ Cut off frequency: 40 — 120 Hz

.............................................................................................................. Cut off slope: –12 dB/octHigh pass filter .............................................................................. Cut off frequency: 40 — 120 Hz

.............................................................................................................. Cut off slope: –12 dB/octMaximum input level/impedance .................................................. RCA: 6.5 V/22 kΩ (0.4 — 6.5 V)Note:• Specifications and the design are subject to possible modification without notice due to



25

GM-X554

- GM-X554/X1R/ESPower source .......................................................................... 14.4 V DC (10.8 — 15.1 V allowable)Grounding system ...................................................................................................... Negative typeCurrent consumption ................................................................ 27.1 A (at continuous power, 4 Ω)Idle current ...................................................................................................................... 4 — 25 mA Average current drawn* .................................................................... 9.1 A (4 Ω for four channels)

......................................................................................................14.5 A (4 Ω for two channels)Fuse ...................................................................................................................................... 20 A x 2Dimensions ...................................................................................... 279 (W) x 58 (H) x 324 (D) mmWeight .................................................................................. 4.8 kg (Leads for wiring not included)Maximum power output .............................................................................. 100 W x 4 / 240 W x 2Continuous power output ........................ 50 W x 4 (at 14.4 V, 4 Ω, 20 — 20,000 Hz, 0.08% THD)

.............................................................. 120 W x 2 (at 14.4 V, 4 Ω, 20 — 20,000 Hz, 0.8% THD)

................................................................ 60 W x 4 (at 14.4 V, 2 Ω, 20 — 20,000 Hz, 0.8% THD)Load impedance ........................................................................................ 4 Ω (2 — 8 Ω allowable)

.................................................................................... (Bridge connection: 4 — 8 Ω allowable)Frequency response ........................................................................ 10 — 50,000 Hz (+0 dB, –1 dB)Signal-to-noise ratio .................................................................................. 100 dB (IEC-A network)Distortion ........................................................................................................ 0.008% (10 W, 1 kHz)Separation .................................................................................................................... 65 dB (1 kHz)Low pass filter ................................................................................ Cut off frequency: 40 — 120 Hz

.............................................................................................................. Cut off slope: –12 dB/octHigh pass filter .............................................................................. Cut off frequency: 40 — 120 Hz

.............................................................................................................. Cut off slope: –12 dB/octMaximum input level/impedance .................................................. RCA: 6.5 V/22 kΩ (0.4 — 6.5 V)

Note:• Specifications and the design are subject to possible modification without notice due to



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