Manual-
OPERATING INSTRUCTIONS
HYPERBOLE
The GE 30 is, as are all Rane equalizers, a constant band-
width device. This guarantees that the
Q
(a measure of band-
width) of all the 1/3-octave filters will be maintained regardless
of the position of the filter’s slide control. This is accomplished
by completely isolating the center frequency and bandwidth
parameters of each filter from the variable resistor connecting the
filter to the signal path. The sliders simply act like mixer faders
would; they sum the outputs of the filters to one of four different
buses—two boost buses and two cut buses. This sort of care-
ful attention to design allows Rane equalizers to perform as no
others.
A further benefit of the constant-Q approach is the ease with
which 0dB of boost or cut can be guaranteed when the control is
set at zero. The filter slide controls feature a grounded center tap
in the Boost/Cut mode and a grounded 0dB position in the Cut-
Only mode. This ensures that none of the filters will affect the
response of the unit when their contribution is unwanted.
The automatic Bypass function of the GE 30 guarantees that
if power is lost, signal will not be. The Bypass relay automatically
closes the bypass loop when either the POWER switch is turned
off, the line cord is disconnected, or some other power interrup-
tion occurs.
The Rane Model GE 30 is a professional equalization tool,
and as such, it would not be wise for us to recommend that you
“Fiddle with it ‘til it sounds good.” It is because of this that we
offer the following:
MEASUREMENTS
We highly recommend that a real time analyzer be used to
display the combined sound system/room response so intelligent
adjustments may easily be made without a lot of trial and error.
Of course, Rane Corporation builds a very nice one (the RA 30),
at a very reasonable price if you are not already in possession of
one.
DICE OR SLICE?
Deciding whether the GE 30 should be operated in the
Boost/Cut mode or the Cut-Only mode is a bit of a sticky
problem. For that matter, referring to the Boost/Cut mode versus
the Cut-Only mode is bound to cause some debate among more
than a few readers. There are those that believe it makes no dif-
ference which mode you use, and there are just as many others
who believe that one or the other is the
one and true way
to go.
This is exactly why the GE 30 offers the options it does. There
are situations where a person of the Cut-Only persuasion needs
to use the “other” type EQ in certain selected locations. If this is
the case, all this person needs to do is get around behind the rack
(hopefully this isn’t too difficult) and press the EQ MODE selec-
tor. There are others who are not as convinced that one or the
other modes is better, but wish to withhold the decision until the
job is installed and ready for test. Whichever the case, the GE 30
performs its duty better than any other product of either type.
AMPUTATION
Setting the corner frequencies of the High Cut and Low Cut
filters is a function of the type of system and the type of material
that passes through the system. For most installations, a set-
ting of 40Hz on the low end and 15 to 20kHz on the high side
will be adequate for protecting expensive drivers and associated
equipment. Should the user prefer these filters have no effect
at all, rotating them to their respective high and low frequency
extremes effectively removes them from the signal path. In all
cases, a somewhat careful study should be made of the overall
system requirements so that the individual 1/3-octave controls
are not used to correct for an improper setting of these filters.
ISOLATION
Finally, select the output configuration (Active or Trans-
former) which suits your requirements. In most situations, the
ACTIVE option is probably the best, since it offers the highest
linearity and bandwidth. The degradation caused by the trans-
former is very slight, and will not contribute anything audible
to the system if this mode is selected. The differences are more
theoretical than practical.
ENLIGHTENMENT
See the RaneNote “Constant-Q Graphic Equalizers” for an
awareness of the benefits of the GE 30’s constant-Q interpolating
filters, available from Rane's website.
©Rane Corporation 080 7th Ave. W., Mukilteo WA 9875-5098 TEL 5-55-6000 FAX 5-7-7757 WEB www.rane.com
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