Summit FEQ-50 Operating Manual
Summit Audio Model FeQ-50
Four-Band Parametric Passive Equalizer
Operation Manual
Summit Audio, Inc.
P.O. Box 326
Gardnerville, NV 89410
(775) 782-8838
email: sound@summitaudio.com
Introduction
Introducing the FeQ-50 four band parametric, passive
equalizer from Summit Audio. The focus of the FeQ-50 from
the very beginning has been the sound. Passive circuitry
excels at rich harmonic content and phase coherency,
resulting in a musically satisfying sonic experience.
DANGER!
HIGH VOLTAGE
IMPORTANT: Check
the bottom sticker
to make sure the
FeQ-50 is manufacture for the voltage
used in your country.
This is done at the
factory or by a
qualified service
center only.
Each of the four bands has six switch selectable frequencies
and 14dB of fully sweepable cut or boost. The low and high
bands can switch between peaking and shelving filters, the low
mid and high mid can switch between narrow and wide bandwidths. Also included is a switchable highpass filter fixed at
30Hz with a gentle 6dB/octave rolloff to reduce rumble. I/O
includes a total of four simultaneous outputs, -10dB and +4dB
vacuum tube out and –10dB and +4dB solid state out. Like all
of our other half-rack sized products, the FeQ-50 has an
internal power supply and 3 year warranty.
Model FeQ-50 4-Band Passive, Parametric Equalizer
2
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Introduction
Features
Fully passive design (no amplifier in filter circuit)
Four frequency bands
±14dB cut and boost
Six switch selectable frequencies per band
Separate, bypassable high pass filter
Master bypass
Four simultaneous outputs, both vacuum tube and solid
state
Internal high voltage power supply
One 12AX7A/ECC83 vacuum tube
3 year warranty
Hand Crafted in the U.S.A.
Carefully unpack the FeQ-50 and it’s power cord. Save the
carton and packing material for possible future use. Before
powering up the unit, read this manual and observe the
cautions for
HIGH VOLTAGE
.
Important Warranty Information
For your 3 year warranty, register your FeQ-50 on line today
at www.summitaudio.com .
Model FeQ-50 4-Band Passive, Parametric Equalizer
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Front Panel
Front Panel
Boost/Cut
Peak/Shelf
Boost/Cut
Bandwidth
0
FeQ-50
+14-14 +14-14 +14-14 +14-14
100
150
60
33
0
270
410
Hz Hz kHz kHz
Freq.
Select
000
OFF
1K
820
680
560
470
HPF
390
1.2
1.5
2.2
3.3
4.75.6
Passive EQ
7.2
5
Low Band
The Low EQ band can be set for either a peak or shelving
response and can boost or cut by up to ±14dB. The center
+14-14
100
60
33
Hz
point of the filter band can be set to any of six frequencies:
150
270
33Hz, 60Hz, 100Hz, 150Hz, 270Hz, or 410 Hz.
410
Low-Mid Band
0
+14-14
1K
820
680
560
470
Hz
The Boost/Cut controls can boost or attentuate the chosen
frequencies by up to ±14dB.
Freq.
Select
The Bandwidth (Q) is slightly less than 2 octaves in the
narrow setting and slightly more than 3 octaves in the wide
setting (maximum gain).
390
The center point of the filter band can be set to any of six
frequencies: 390hz, 470Hz, 560Hz, 680Hz, 820Hz, or
1kHz.
IN
10
8.2
12.5
18
BYPASS
ON POWER
4
Summit Audio, Inc.
f
High-Mid Band
The Boost/Cut controls can boost or attenuate the chosen
frequencies by up to ±14dB.
The Bandwidth (Q) is slightly less than 2 octaves in the
narrow setting and slightly more than 3 octaves in the wide
setting (maximum gain).
The center point of the filter band can be set to any of six
frequencies: 1.2 kHz, 1.5 kHz, 2.2 kHz, 3.3 kHz, 4.7 kHz
and 5.6 kHz.
High Band
The High-Mid EQ band can be set for either a peak or
shelving response and can boost or cut by up to ±14dB. The
center point of the filter band can be set to any of six
frequencies: 5 kHz, 7.2 kHz, 8.2 kHz, 10 kHz,
12.5 kHz, or 18kHz.
Freq.
Select
Freq.
Select
7.2
5
Front Panel
0
Boost/Cut
1.2
kHz
10
8.2
kHz
+14-14
1.5
2.2
3.3
4.75.6
0
12.5
18
Bandwidth
Boost/Cut
+14-14
Peak/Shel
Bandwidth Control
On the two mid-bands, the bandwidth control sets the Q or
width of the bell-shaped response curve. The bandwidth
circuit employs a “proportional Q” design, which results in a
wider bandwidth at low boost/cut settings and a narrow
bandwidth at high boost/cut settings.
Peak or Shelving Response
The Low and High EQ bands can be set for either peak or
shelving response. In shelf mode, for example, the High band
continues to boost or cut frequencies above the center
frequency. In peak mode the High band creates a bell-shaped
response curve.
Model FeQ-50 4-Band Passive, Parametric Equalizer
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