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Dear customer,
thank you very much for purchasing our F 52 EQ system. This active highpass equalizer was de-
signed specially for use with our F series miniature speakers to furthermore improve their low-
frequency reproduction.
By selectively boosting the frequencies below 50 Hz with a steep cutoff at 35 Hz, a linearization
of the low-end frequency range is realized, with the positive effect of having less stress put on
the speakers.
Connection of the F 52 EQ is extremely simple, for most applications the unit can be simply
wired between preamplifier and power amplifier.
To become quickly accustomed with the F 52 EQ's functions, please read the following
instructions carefully.
The Zeck team
1. Rewiring the F 52 EQ for 110 V mains
supply
The F 52 EQ has been factory-prewired for opera-
tion with 220 / 240 V mains supply, but can be in-
ternally rewired to work with a 110 V mains supp-
ly. As this procedure, which is described below, in-
volves opening the unit and working on the mains
wires, it should be left to a qualified service per-
son.
- make sure that the mains cable is disconnected
- loosen the screws "A" (Fig.1) on upper and
bottom side of the unit. The other two screws
on each side are only there for optical reasons
and must not be loosended.
- remove the upper cover of the unit
- loosen the screw of the terminal marked
"IN 220 / 240 V" (Fig.2) and connect the sup-
ply cable to the "IN 110 V" terminal instead.
Make sure that the cable is now securely
connected to the "IN 100 V" terminal, and that
there are no loose wires that could cause a
short between the two terminals.
- put the cover back on the unit and re-tighten
the 4 screws
Fig. 1
Power supply
Power supply
110 V ac
220 / 240 V ac
IN
IN
1 1 0 V
2 2 0 / 2 4 0 V
Protection fuse
Fig. 2
2. Connection of the F 52 EQ
The rear side of the F 52 EQ holds two pairs of
RCA phono jacks (Fig.3), one pair for the inputs
(L and R) and one pair for the outputs (L and R).
The L and R outputs of the preceding device (pre-
amplifier or preamp-output of an integrated am-
plifier), which should have an maximum output
level of 3 V RMS (+12 dB), must be connected to
the two "IN" jacks. The input of the power ampli-
fier is connected to the two "OUT" jacks. For a
monoaural setup, just use one of the channels of
the F 52 EQ (L or R).
Fig.4 shows an example for a stereophonic
setup with separate preamplifier and power
amplifier.
3. Technical specifications
Frequency range .......................35 Hz - 40 kHz
Max. input voltage ...............3 V RMS (+12 dB)
Input impedance ..............................10 kohms
Max. output voltage .............6 V RMS (+18 dB)
Output impedance ...............................1 kohm
Distortion ............................................0.003%
Cutoff frequency of
highpass-filter .............................35 Hz / 12 dB
Low-frequency boost .................6 dB @ 50 Hz
Mains power supply .......110 V or 220 / 240 V,
50 / 60 Hz
Power consumption ...............................1.2 W
Size .....................................85 x 44 x 133 mm
Weight ...................................................350 g
2 years full warranty
Audio signal
Earth
Left channel
Right channel
Fig. 3
Preamplifier
Output
L
R
L
R
L
R
L
R
Out
IN
L
R
F 52
F 52
Monitor
Monitor
Power
L
R
amplifier
Output
Input
L
R
L
R
Rear
terminals
terminals
red
black
red
black
Fig. 4
Rear
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