SABINE FBX SOLO 620 SL-620 Operating Manual page 3

A DIRECT HIT ON FEEDBACK!
FBX-SOLO targets feedback without taking
a big chunk out of your sound. Tests prove
that a single 1/3-octave EQ slider pulled
down 12 dB removes almost half the power
going to the speakers over a two-octave
range. And, as the illustration at right
shows, you can't place a graphic EQ filter
precisely on the ringing frequency. When
you pull down multiple sliders in a normal
setup (below), you end up with giant holes
in your sound. On the other hand, FBX
constant "Q" micro-filters are 10 times
narrower - you get back up to 90% of the
power you lose with a graphic EQ! That
means more gain before feedback and no
loss in sound quality.
0.0 dBV
-1.875
-3.750
-5.625
-7.500
-9.375
-11.25
-13.13
-15.00
100 Hz
HOW CAN THE SOLO BE USED?
Assign a SOLO to any specific mixer channel. You can also use the SM-620 to connect a
phantom-powered mic to a non-phantom-powered mixer.
Look for this symbol for
specific information on
the SL-620.
The 0 dB
6 dB
12 dB
500 Hz
1K 10K
1000 Hz
FREQUENCY RESPONSE:
Full Set-Up FBX vs. 1/3-Octave Graphic
Equalizer.
Test procedure: A PA system was
set up using a microphone, mixer, FBX, power
amp and two speakers. The system's gain was
raised until the FBX removed six feedback points.
Next, the FBX was replaced with a 1/3-octave
graphic EQ. The EQ was adjusted while the
input was raised to the same level achieved with
the FBX. The frequency response curves of each
device were then plotted.
What this means to you: Doubling the cost of your
microphones, speakers and power amp probably
would not improve your system's frequency
response as much as replacing your EQ with an
FBX for chasing feedback.
Look for this symbol for
specific information on
the SM-620.
2000 Hz
3