Tweeter Protection - Zeck CLUB CD12.1 Bedienungsanleitung

Connection of cabinets (contd.)
Connectors
All Club series cabinets are equipped with
4-pole Speakon connectors. These connec-
tors have a locking mechanism that prevents
the speaker cables against accidental
unplugging. After insertion, the plugs have
to be rotated clockwise for ca. 1/8 turn until
they snap into contact/locking position.
The following illustration shows the required
wiring for a Speakon plug, seen from its
solder side:
All Club series cabinet models are equipped
with an automatic tweeter protection. This
electronic circuitry consists of two stages
that are designed to protect the tweeters
against all sorts of overload situations.
Short overvoltage peaks are absorbed by a
peak limiter before they can reach the
tweeter driver. Prolonged overloads which
would be able to overheat the tweeter's
voice coil are limited by a PTC thermistor.
12
2.
1.
Masse
Signal
1-
1+
2+
2-

Tweeter protection

Cables
Speaker cables should have sufficient
thickness to keep losses as low as possible.
As a rule of thumb, the longer the cable
and the lower the speaker impedance, the
thicker the cable should be. Subwoofers in
particular should always be connected with
thicker cables.
The following table shows the minimum
cable thickness in mm
and impedances that is required to keep
cable losses below 8%:
Length
5m 2 × 1.5
10m 2 × 2.5
15m 2 × 4
20m 2 × 4
Precaution: Speaker cables must always be
run so that any danger of persons tripping
over or getting caught in a cable is absolutely
excluded. This precaution must be particu-
larly observed in dark stage areas, near stage
entrances, near the front edge of the stage
and on dancefloors.
If the cabinet suddenly produces no more
high frequencies, it has most likely be driven
beyond its power capability for a prolonged
time. In this situation, reduce power amplifier
volume and wait for ca. 2-3 minutes until the
protection circuit has automatically reset
itself. Continue operation of the cabinet at a
somewhat lower volume to avoid re-
triggering of the protection circuit.
2
for several lengths
ohms
4 8
2 × 0.75
2 × 1.5
2 × 2.5
2 × 4