Monacor DNU-400 Instructions D'assemblage page 11

4.4.1 Speaker protection
If the bass/midrange speaker is to be provided with a
speaker protective device, one of the devices indicated
in chapter 4.2.1 "Midrange speaker protection" can be in-
serted into position S1.
Important!
If no protective device is used, solder a jumper into posi-
tion S1 in any case.
4.4.2 Second low pass 6 dB without impedance
linearization or level attenuation
1) Assemble position L2.
2) Solder a jumper into position C4.
3) Connect the bass/midrange speaker with "+M" and
"-M" (do not mix up with "-M ").
4.4.3 Second low pass 6 dB with impedance
linearization
1) Assemble the positions L2, C6, and R3.
2) Solder a jumper into position C4.
3) Connect the bass/midrange speaker with "+M" and
"-M" (do not mix up with "-M ")
4.4.4 Second low pass 6 dB with level attenuation
1) Assemble the positions L2, R2, and R3.
Hint: If the level attenuation is not made via a voltage
divider as usual but via a series resistor only, do not
assemble position R3.
2) Solder a jumper into position C4.
3) Connect the bass/midrange speaker with "+M" and
"-M ".
4.4.5 Second low pass 12 dB all variants
Assemble the PCB as described in the corresponding
chapter 4.4.2, 4.4.3, or 4.4.4, and additionally position
C5.
4.3 Possible combinations of the
individual branches
When realizing individual crossover network develop-
ments or reconstructing existing concepts, the configura-
tions of the individual branches mentioned in chapters
4.1 to 4.4 can be combined with each other as desired.
However, the most common combinations of crossover
features for well-balanced speakers are:
TP 6 dB; MP 6 dB/ 6 dB; HP 6 dB
TP 6 dB; MP 6 dB/ 6 dB; HP 18 dB
TP 6 dB; MP 6 dB/12 dB; HP 12 dB
but above all
TP 12 dB; MP 12 dB/12 dB; HP 12 dB
and not very usual
TP 12 dB; MP 12 dB/ 6 dB; HP 6 dB
Generally, any deviation from these indications in combi-
nation with certain speakers may also be the ideal cross-
over network!
5 Polarities
The pole markings of all connections primarily serve for
identification purposes. According to submitted circuit
diagram or the technical requirements of a new develop-
ment the speakers sometimes can or have to be connect-
ed with "wrong polarity".
6 Refinements
Completions of the circuit may be useful, e. g. in the mid-
frequency and high frequency branches. In this case an
impedance linearization and a level attenuation for the
midrange speaker is possible simultaneously. The tweet-
er could need an 18 dB filter and its level could be at-
tenuated.
These small additional circuits cannot be integrated
any more into a universal PCB with an effort to be justi-
fied. Therefore, the required components should be
placed either on additional PCBs (e. g. DNU-10 by
MONACOR) or be soldered and fixed to the chassis by
wiring as desired.
Many further circuit diagrams can be realized with the
DNU-400 by bridges and interrruptions of existing con-
ductor tracks aiming at a special purpose. There are
hardly any limitations to the creativity.
Subject to change.
GB
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