EarthQuake XJ-600R User Manual

DIGITAL FEEDBAC K C L A S S “ J ” M O N O B LOCK AMPLIFIER

USERS MANUA L

www.earthquakesound.com

XJ-600R

MODEL

Sound That Will Move You

The is capable of generating high sound
pressure levels. You should exercise caution when

operating this amplifier system. Long term
exposures to high levels of sound pressure will cause
permanent damage to your hearing. Sound pressure levels
exceeding 85dB can be dangerous with constant exposure. Set
your audio system to a comfortable loudness level. Earthquake
Sound Corporation does not assume liability for damages
resulting from the direct use of the XJ-600R , and urges users to
play the XJ-600R at moderate listening levels.

XJ-600R

THE CHA RT (ON THE SIDE ) SHO WS TH E U.S . GOV ERN MEN TS

OCCUPATI ONA L SAF ETY AN D HEA LTH ADM INI STRATIO N (OS HA)

REGUL ATIONS WHICH WERE I N EFF ECT AT TH E TIM E OF TH IS

PUBLI CATION FOR PER MIS SIB LE NO ISE E XPO SUR E,

PER 29C FR1 910 .95 , TABL E G-1 6.

97
100
102

105
11 0
11 5

3
2
1 - 1 1/2

1
1/ 2
1/ 4 or l es s

SOU ND L EV EL

DBA

90
92
95

8
6
4

DUR AT IO N

IN HO UR S

Congratulations and thank you for choosing the new Earthquake XJ-600R
Subwoofer Power Amplifier as a key component for your audiophile system.
The XJ-600R amplifier is designed to meet the highest standards of
performance and sound quality. In addition, Earthquake Sound’s IQ certification
and patented Class “J” circuitry ensures that the amplifier meets and exceeds all
industry standards. The new XJ-600R amplifiers include many unique
technologies that allow it to deliver “World Class” performance, even under
extreme operating conditions.

The XJ-600R is a ruggedly constructed high quality professional amplifier. The
Digital feedback class “J” Circuitry, allows the amplifier to produce massive
amounts of power with minimal heat production. This patented circuitry delivers
high efficiency in the range of 99%- The typical class AB amplifier runs at about
40 to 50%.

The XJ-600R offers a room correction technique that surpasses that of all
previous attempts. The intelligent “Back EMF” drive circuit interacts with the
subwoofer design and memorizes system tuning frequencies and system type.
The information which is stored in microprocessor turns on a preset group delay
curve that serves as a correction reference. This information deals only with
time correction that moves the peaks and the dips in a room to a flat. Once that is
achieved the user will resort to the final correction- EQ the room. For that reason
Earthquake’s XJ-600R is truly an intelligent system. 20Hz, 30Hz and 40Hz
frequencies can be cut or boosted by a whopping 12dB, these corrections help
in producing wider range of listening position that is unprecedented for the
room.

(Note: boosting the response at 20Hz is very demanding for your subwoofer.
Consult with your subwoofer maker, and determine if their subwoofer is
designed to take a boost at such low frequencies.)

Introduction

2

CAUTION:

Specific ation s Are Subject To Chan ge Wi thout Noti ce

XJ-600R Subwoofer Power Amplifier

Unpacking and Warnings

Speci fications & featu res are s ubjec t to change without n otice . www.earthquakesound .com

3

ITEMIZED LIST OF INCLUDED ACCESSORIES:

1. One (1) AC Power Cable

2. One (1) Users Manual

3. One (1) Registration/Warranty Card

4. One (1) Remote Control

4. Rack Mounting Brackets and Screws

When you have safely removed the amplifier from the packaging and placed it in a safe area, perform a thorough physical inspection and report any damage to the dealer
that you purchased the unit from. We suggest that you keep the original packaging, and that it should be stored in a safe, dry place in case you’re required to transport the
unit. The customized packaging is specially designed to protect the amplifier from potential damage that can arise when shipping such a product.

To reduce the risk of fire or electric shock, do not expose this product to rain or moisture. Don not attempt to “lift the ground” by removing
the ground pin from the AC cable. Make sure that your household electrical wiring supports proper AC grounding techniques before
plugging in this product. Keep the heat sinks and top cover free of dust to allow for proper heat dissipation. Never expose this product to
extreme temperature. Always connect the audio signal path cable prior to connecting the AC mains.

WARNING!

CAUTION!

No user-serviceable parts inside. Do not attempt to remove cover or repair this product, as severe electrical shock may result and it may
disrupt your warranty.

IMPORTANT!

Make sure that your local AC voltage complies with the unit’s label. Damage caused by plugging this amplifier into an AC receptacle of the
wrong voltage will not be covered by warranty.

Specific ation s Are Subject To Chan ge Wi thout Noti ce

XJ-600R Subwoofer Power Amplifier

Subwoofer Placement Guide

Why having two gains on a mono subwoofer is
a good thing?

Often you hear the term “subwoofers are non-directional”;
this is not true subwoofer placement is harder to pick when to
low frequencies are crossed . The wider the room, the more
directional the subwoofer. The easiest solution is to use two
subwoofers in the front: one on the left and a second on the
right. The signal to both is mono. In some applications, users
might have small front speakers or planer speakers. Both
speakers have an early roll off in the sub-harmonics. The
planer needs help from 150Hz on down, having two front
subwoofers placed on the left and the right is a health
solution to this problem.

Two Subs

While having two subwoofers is better than one, the MONO
signal that drives these subwoofers keeps them from
projecting the three dimensional images in the sub­harmonics. The use of two subwoofers allows you to cross
the sub up to 150 Hz sound quality, imaging and staging. The
two-front-subwoofer-system is an excellent solution to planer
speaker’s low frequency response early roll off. When
locating these subwoofers in a close proximity to the stereo
satellite, the subs will enhance low frequency extention. It
will be better to have a stereo subwoofer to help in the lower
bass notes and their placement.

If a bass Guitar player was standing on the left side of the
stage, and he played an EE note (42Hz) then the right sub will
also respond to that and create havoc on the stage. This can
occur if you only have one single sub in the room and it’s
placed on the right side of the room, while the bass guitar
player is playing his music on the left side of the stage. As
soon as he hits the EE note the sub speaks out on the right
and completely destroys the stage. To give you three­dimensional front-end bass that allows you to have a low
frequency dynamic stage, Earthquake designed dual input
circuits that use buffers to maintain your stereo separation on
the processor side while mixing stereo front signals to
produce 3D bass.

Th e blue ar ro w represents th e sub-harmoni c
frequen cies as they mo ve a lways tow ard the
middle in a m ono-t wo-subs - syste m.

The re d ar ro w re present the lows+ the mids+ highs
as they fol low the a ction.

Note the br eakaw ay and the im age sep aration

BETTER / Th is illu stratio n shows d ual subwo ofer wi th mono sig nal

4

In this illustra tion th e st ereo su bw oofer s keep the
sub - h arm o nic s dyn a mic a l ly s ync h r oni z ed i n
motion wi th the re st of the aud io syst ems.

Fully compl ement ar y su b-har monics to the mids
and the hig hs

BEST / Th is illu stratio n shows d ual subwo ofers w ith stere o+mon o signals

GOOD / This i llust ration sh ows a sin gle subwo ofer se tup

Th e b lue a rro w rep re sen ts th e s ub har mo nic
frequen cies as they m ove always towa rd t he sub in
the singl e sub sys tem.

The red arrow rep resen ts t he l ows+ mids + hi ghs as
they foll ow the ac tion.

Note the br eakaw ay and the im age sep aration .

Best resp onse if t he blue and t he red ar e identic al.

Specific ation s Are Subject To Chan ge Wi thout Noti ce

XJ-600R Subwoofer Power Amplifier

Front and Back Panel Overview

5

Specific ation s Are Subject To Chan ge Wi thout Noti ce

40Hz

200Hz

CROSSOVER

0 20m s

ON

OFF

PHASE DELAYSUBSONIC

0

180

PHASE SHIFT GAIN

AUTO

ON

OFF

ON

BYPASS

CH1

CH2

MAIN

POWER

IN

OUT

ROOM C ORREC TION

-6dB +6d B -6dB +6d B

-6dB +6dB

20Hz 30Hz 40Hz

POWE R

XJ -60 0R

DUAL INPUT - MONO BLOC K - CLASS "J" POWER AMPLIFIE R

AC Power

Connection

110-120V/
220-240V
Switch

Speaker

Output

MAIN GAIN

Push B utton

One push o f the kn ob wil l
adj ust i np ut ch an ne l- 1,
an oth er pus h w ill adju st
channel-2 a nd a t hir d p ush
w ill a dj ust b ot h ga in s
s im ul ta neo us l y (m as te r
gain). The XJ' s LE Ds w ill
indicate whi ch cha nne l i s
selected.

DC 12V Trigger Input
Standard 1/8"

Signal Input CH-2

High Buffered Mixer
of LFE & Stereo

Use Only 1 Input For Each Channel

25Hz 12dB/Oct
Switchable
Subsonic Filter

MUTE

VOLU ME

CH-S EL

On e r em ote ca n be us ed t o
sim ultan eousl y contr ol the Vol ume
on mu ltipl e XJ ampl ifier s

In mu te mode , the MAI N LED wil l be
fla shing o n and off .

For s elect ing con trol ch annel s

XJ Remote C ontro l

Phase Shift
By Delay Up
To 20ms

0-180° Phase
Correction

Room Equalization
Adjustment Center

Main Power
ON/OFF Switch

24dB/Oct Lowpass
Crossover With
Bypass Option

Channel and Power
Status LEDs

Signal Input CH-1

Sensor Input
Standard 1/8"

Ground

SPE AKER OU TPUT

RCAXLRHI- LEVEL

CH2 T INP U CH1 T IN PU

HI- LEVEL

DC12V

TRIGGERIRINPU T

110-120V 220-240V

110-120V~/60Hz 110-120V, FUS E T6.3AL/250V

220-240V~/50Hz 220-240V, FUS E T3.15AL/250V

Fuse Holder

6.3 AM PS
MAX

Music Sensing Auto
Turn ON Switch

OFF Posi tio n: Req uir ed when
amp i s p owe red via the 12V DC
trigger in put loc ate d at the b ack
o f t h e a m p l i f i e r .
ON Position: Amp on all of the
t i m e ( n ot re c o m m ende d ) .
AUTO Pos iti on: If no sig nal is
present th e am p wi ll g o to s lee p
a f t e r 2 0 m i n u t e s
(recommended).

XJ-600R Subwoofer Power Amplifier

The back side of a typical processor or receiver

SUB

Single Subwoofer (Stereo & Mono) Connection

6

Single su bwoof er applic ation

GOOD

Specific ation s Are Subject To Chan ge Wi thout Noti ce

RCA splitt ers can b e used to dou ble the
input sig nal str ength. Ma ximum o utput
can be reac hed wit h 400mv inp ut, usi ng
one RCA.

SPEAK ER OUT PUT

RCAXLRHI-L EVEL

CH2 T IN PU CH1 T INPU

HI-LE VEL

DC12V

TRIGGERIRINPUT

110-120V 220-240V

110-120V~/60Hz 110-120V, FUS E T6.3AL/250V
220-240V~/50Hz 220-240V, FUS ET3.15AL/250V

6.3 AMP S
MAX

XJ-600R Subwoofer Power Amplifier

SPEAK ER OUT PUT

RCAXLRHI-L EVEL

CH2 T INP U CH1 T INPU

HI-LE VEL

DC12V

TRIGGERIRINPUT

110-120V 220-240V

110-120V~/60Hz 110-120V, FUS E T6.3AL/250V
220-240V~/50Hz 220-240V, FUS ET3.15AL/250V

6.3 AMP S
MAX

SPEAK ER OUT PUT

RCAXLRHI-L EVEL

CH2 T INP U CH1 T INPU

HI-LE VEL

DC12V

TRIGGERIRINPUT

110-120V 220-240V

110-120V~/60Hz 110-120V, FUS E T6.3AL/250V

220-240V~/50Hz 220-240V, FUS ET3.15AL/250V

6.3 AMP S
MAX

LEFT

RIGHT

The back side of a typical processor or receiver

Dual Subwoofer (Stereo & Mono) Connection

7

Specific ation s Are Subject To Chan ge Wi thout Noti ce

BEST

Three dim ensio nal

subharm onic sy stem

using two X J600- R

and two sub woofe rs

XJ-600R Subwoofer Power Amplifier

Room Correction

8

Specific ation s Are Subject To Chan ge Wi thout Noti ce

XJ-600R Subwoofer Power Amplifier

The XJ-600R offers a room correction technique that surpasses that of all previous
attempts. The intelligent “Back EMF” drive circuit interacts with the subwoofer design
and memorizes system tuning frequencies and system type. The information which is
stored in microprocessor turns on a preset group delay curve that serves as a
correction reference. This information deals only with time correction that moves the
peaks and the dips in a room to a flat. Once that is achieved the user will resort to the
final correction- EQ the room. For that reason Earthquake’s XJ-600R is truly an
intelligent system. 20Hz, 30Hz and 40Hz frequencies can be cut or boosted by a
whopping 12dB, these corrections help in producing wider range of listening position
that is unprecedented for the room.

(Note: boosting the response at 20Hz is very demanding for your subwoofer. Consult
with your subwoofer maker, and determine if their subwoofer is designed to take a
boost at such low frequencies.)

When setti ng th e roo m EQ, DO NOT over power the speak ers a s
this may ca use them to bottom out or cau se othe r mo re seve re
problem s th at your war ranty wil l no t co ver. To set up the room
EQ, you wil l need a Spec trum-An alyze r, or y ou can us e th e rule of
thumb.

Amplifier Specifications

9

Specific ation s Are Subject To Chan ge Wi thout Noti ce

POWER OUTPUT

FREQUENCY RESPONSE

TOTAL HARMONIC DISTORTION

SLEW RATE

SIGNAL TO NOISE RATIO

LOAD IMPEDANCE

DAMPING FACTOR

CONTROLS

INPUT CONNECTIONS

OUTPUT CONNECTIONS

MODE SWITCHES

PROTECTION CIRCUITRY

POWER REQUIREMENTS

SIZE AND WEIGHT

RACK MOUNT SPACE

1 x 700 watts RMS @ 2-Ohms

1 x 570 watts RMS @ 4-Ohms

1 x 320 watts RMS @ 8-Ohms

10Hz - 2.4kHz

<0.08%, (1W/4ohm)

50 volts / microsecond

> 89dB (balanced) 85dB (unbalanced) @ rated power

2 ohms or greater

> 500

XLR / RCA • High-level

Binding posts

Phase switch 0° - 180° - Variable time delay 0 to 20 millisecond

Short circuit, open circuit, RF burnout, over temp,

protection, DC protection, limiter circuitry

turn on/off transient

Power • Roo m equal ization • R oom equ alizati on IN/O UT • Subs onic
filter • Ph ase shi ft • Lowpas s, Bypa ss • Channe l and pow er s tatus
LEDs • Dual g ains in ternall y mixed • M usic sens ing ON/ OF F • DC
turn ON/O FF

110-12 0VAC~/ 60Hz
110V-24 0V~/5 0H z

H=1-3/4 " x W=19" x D =14-1/2 "
44mm x 483m m x 367mm

18.76lb s. • 7.6K g

1U

XJ-600R Subwoofer Power Amplifier

Troubleshooting Information

10

Specific ation s Are Subject To Chan ge Wi thout Noti ce

XJ-600R troubleshoot guide:

This menu is built around installer's feed back and some basic issues they may face in the field. It is intended to provide you with ideas on how to troubleshoot & isolate
the problem.

WARNING: Do not tamper with the internal circuitry doing so may cause damage to you, the amplifier and will indefinitely void the warranty.

Problem:

1. No Power At All: Make sure the main power switch is ON (pressed in/left front panel), check for AC power presence, then check if main circuit breaker is tripped off or if

power cord came unplugged. If all the above passed the test, check the fuse located in the power inlet, horizontal drawer case. Replace it with the appropriate size. If the
amp still doesn't work or continues to blow fuses then proceed to call Earthquake's tech department.

2. Amp Powers Up But No Output: GREEN light is On; switch the Auto turn On selector (right front panel) to the off position and shut down the signal source
(processor/receiver). LED status should be RED now. Next, switch the selector to the middle position, AUTO; now turn on the signal source and watch for the LED status
to turn GREEN. If LED does not turn GREEN then the amplifier is not detecting a signal. Check the audio connection & set-up before the amplifier.

3. RED Light Always Stays On: Unplug the amplifier from the wall outlet and wait 20-seconds then reconnect the power plug. Now power up amplifier without any signal
connected to it and watch for the LED status to turn GREEN.

If you have tried and failed with all of the provided solution then you should call Earthquake for further assistance: 800-576-7944

XJ-600R Subwoofer Power Amplifier

Specific ation s Are Subject To Chan ge Wi thout Noti ce

Consumer Warranty & Guidelines

Earthquake warrants the original purchaser that all Factory Sealed - Bent speaker frame, broken speaker connectors, holes in speaker
New Audio Products be free from defects in material and workmanship, under cone, surround & dust cap, burnt speaker voice coil.
normal and proper use, for a period of five (5) years from the date of purchase - Fading, deterioration of speaker components & finish due to improper
(as shown on the original bill of sale with serial number affixed/written on it). The exposure to elements.
five (5) years warranty period is valid only if the product is properly installed by - Bent amplifier casing, damaged finish on the casing due to abuse,
an Earthquake authorized party, and the warranty registration card is properly misuse, or improper use of cleaning material.
filled out and sent to Earthquake Sound Corporation. If the product is installed - Burnt tracers on PCB.
by a non-authorized party, a ninety (90) days warranty period applies. - Product/part damaged due to poor packaging or abusive shipping

conditions.

(A) Five (5) years limited warranty plan coverage guidelines: - Subsequent damage to other products.

A warranty claim will not be valid if the warranty registration card is not properly

- First year: Earthquake pays for labor, parts, and ground freight (only in filled & returned to Earthquake with a copy of the sales invoice.

US mainland, not including Alaska and Hawaii) back to customer.

- Second year: Earthquake pays for labor and parts only, customer must (E) Service Request:
pay freight both ways.

- Third, fourth & fifth year: Earthquake pays labor only. Customer must To receive product/s service, contact Earthquake service department
pay for parts and freight both ways. at [phone] and request an RMA number (Return Material Authorization),

items shipped without a valid RMA number will be refused. Make sure you

(B) Warning: provide us with your complete/correct shipping address, a valid phone number,

and a brief description of the problem you are experiencing with the product. In

Products (sent for repair) that are tested by Earthquake technicians most cases, our technicians might be able to resolve the problem over the

and deemed to have no problem, will not be covered by the five (5) years limited phone, thus eliminating the need to ship the product.
warranty. Customer will be charged a minimum of one (1) hour of labor (ongoing
rates) plus shipping charges back to customer. (F) Shipping Instructions:

(C) Earthquake agrees to repair or replace - at our option - all such defective Product/s must be packaged in its original protective box/s to minimize
products/parts subject to the following provisions: transport damage. Shipper claims regarding items damaged in transit must be

presented to carrier. Earthquake Sound Corporation reserves the right to refuse

- Defective products/parts have not been altered or repaired by other product improperly packed. Original purchase receipt must accompany product
than an Earthquake factory approved technician. returned for service. We encourage you to include with the package a written

- Products/parts are not subjected to negligence, misuse, improper use, description of the problem. Ship product to: Earthquake Sound Corp. 2727 Mc
or accident, damaged by improper line voltage, used with incompatible Cone Avenue, Hayward, CA 94545. Ph [phone]. You are responsible for
products, or have its serial number or any part of it altered, defaced or the cost of shipping the product to Earthquake Sound Corporation.
removed, or have been used in any way that is contrary to Earthquake's
written instructions. (G) Disputes Resolution:

(D) Warranty Limitations: All disputes - between clients and Earthquake Sound Corporation -

resulting from the five (5) years limited warranty policy must be resolved
Earthquake warranty does not cover products that have been modified or according to the laws & regulations of the county of Alameda -California.
abused. Including but not limited to the following:

- Damages to speaker cabinet and cabinet finish due to misuse, abuse,

use of improper use of cleaning materials/methods.

XJ-600R Subwoofer Power Amplifier

Sound That Will Move You

Earthquake Sound reserves the right to amend details of the specifications without notice.

Copyright© Earthquake Sound Corporation

Earthquake Sound Corporation • 2727 McCone Avenue Hayward CA, 94545

Phone: [phone] Fax: [phone]