EarthQuake IQ600 User Manual

Digital Feedback Class “J” Subwoofer Amplifier

600WRMS

USER MANUAL

Earthquake Sound Corporation | 2727 McCone Avenue, Hayward CA 94545

www.earthquakesound.com

IQ600

MODEL

Sound That Will Move You.

The IQ600 is capable of generating high sound
pressure levels. You should exercisecaution 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 withconstant exposure. Set
your audio system toa comfortable loudness level. Earthquake
Sound Corporation does not assume liability for damages
resulting from the direct use of the IQ600 , and urges users to
play the IQ600 at moderatelisteninglevels.

THE C HART (O N THE SI DE) SHO WS THE U.S . GOVE RNME NTS

OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA)

REG ULATIONS WH ICH WE RE IN EFF ECT AT THE TIME O F THIS

PUBLICATION FOR PERMISSIBLE NOISE EXPOSURE,

PER 29CFR1910.95, TABLE G-16.

97
100
102
105
110
115

3
2
1 - 1 1/ 2
1
1/2
1/ 4 or l ess

SOUND LEVEL

DBA

90

92

95

8
6
4

DURATION

IN HOURS

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

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

IQ600

IQ600

IQ600

IQ600

IQ600

IQ600

The offers a roomcorrectiontechnique that surpasses thatof 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 thatmovesthe peaks and the dipsina room to a flat.Oncethat is
achieved the userwill resort to the finalcorrection- EQ the room.Forthat reason
Earthquake’s is truly an intelligent system. 20Hz, 30Hz and 40Hz
frequencies canbe cut orboosted by awhopping 6dB, these corrections help in
producing wider range oflisteningpositionthatis 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:

Specifications Are Subject To Change Without Notice

IQ Suboowfer Power Amplifier

Unpacking and Warnings

Specifications & features are subject to change without notice. www.earthquakesound.com

3

ITEMIZED LIST OF INCLUDEDACCESSORIES:

1. One (1) AC Power Cable

2. One (1) OwnersManual

3. One (1) RegistrationCard

4. One (1) RemoteControl

4. Rack Mounting Bracketsand Screws

When you have safelyremovedthe amplifier from the packagingand placed it in a safearea,perform a thorough physical inspection andreportany damage to the dealer
that you purchasedtheunit from. We suggest thatyoukeep the original packaging,andthat it should be storedin a safe, dry placeincase you’re required totransportthe
unit. The customized packaging isspecially designed to protect the amplifier frompotentialdamagethat can arise when shipping sucha product.

To reduce the risk of fireor electric shock, do not expose this product torain or moisture. Don not attempt to “lift theground” 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 topcover freeof dust to allow for proper heat dissipation. Never expose this product to
extreme temperature. Always connect the audio signal pathcable prior to connecting theAC mains.

WARNING!

CAUTION!

No user-serviceableparts inside. Do not attempt to removecover or repair this product, as severeelectrical shock may result andit may
disrupt your warranty.

IMPORTANT!

Make sure thatyourlocalAC voltage complies with the unit’s label.Damagecaused by plugging thisamplifierintoanACreceptacle of the
wrong voltage will notbecoveredbywarranty.

Specifications Are Subject To Change Without Notice

IQ Suboowfer Power Amplifier

Subwoofer Placement Guide

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

Two Subs

Often you hear the term “subwoofers are non-directional”;
this isnot true subwoofer placement is harder to pick when

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 someapplications, 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.

While having two subwoofers is better than one, the MONO
signal that drives these subwoofer keeps them from
projecting the three dimensional images in the sub­harmonics. The use of two subwoofers allows you to cross
the subup to 150Hz sound quality, imaging and staging. The
two-front-subwoofer-system is an excellentsolutiontoplaner
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 theirplacement.

If a bass Guitar player was standing on the left side of the
stage, and he playedanEE note (42Hz) then therightsub will
also respond to that and create havoc on the stage. In fact 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 usebuffersto maintain your stereoseparation on
the processor side while mixing stereo front signals to
produce 3D bass.

to

low frequencies

The blue arrow represents the sub-harmonic
frequencies as they move always toward the
middle in a mono-two-subs- system The red arrow
represent the lows+ the mids+ highs as they follow
the action, Note the breakaway and the image
separation

BETTER / This illustration shows dual subwoofer with mono signal

4

In this illustration the stereo subwoofers keep the
sub-harmonics dynamically synchronized in
motion with the rest of the audio systems. Fully
complementary sub-harmonics to the mids and the
highs

BEST / This illustration shows dual subwoofers with stereo+mono signals

GOOD / This illustration shows a single subwoofer setup

The blue arrow represents the subharmonic
frequencies as they move always toward the sub in
the single sub system The red arrow represents the
lows+ mids+ highs as they follow the action Note
the breakaway and the image separation. Best
response if the blue and the red are identical

Specifications Are Subject To Change Without Notice

IQ Suboowfer Power Amplifier