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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 CHART (ON THE SIDE) SHOWS THE U.S. GOVERNMENTS
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA)
REGULATIONS WHICH WERE IN EFFECT AT THE TIME OF 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 less
SOUND LEVEL
DBA
90
92
95
8
6
4
DURATION
IN HOURS
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:
Specifications Are Subject To Change Without Notice
XJ-600R Subwoofer Power Amplifier