OHM CT-10 Manual - page 10
CT-8 / 10 / 12 / 15 Full Range Loudspeakers
Ve
rs
io
n
2.0
ww
ww
w.
w.
oh
oh
m
m.
co
co
u
.u
k
k
10
6.2 Signal Processing
External processing is often needed, for example, to accommodate particular program material,
less than optimum acoustics, feedback control, or personal taste. Processing units are also be
used to set the delays and crossover between cabinets.
CT-10, CT-12 and CT-15 Phase and impedance corrected crossover networks are designed for high
power applications and the mandatory use of external EQ provides unrivalled tonal balance and
transient response.
All the latest Ohm signal processors can be accessed by the Ohm Spyder software which is
available for download on the Ohm website. www.ohm.co.uk/ohm_downloads.htm. Please check
back regularly to ensure you have the latest version. (Always ensure that your current settings
are backed up before installing new versions of the software to avoid deleting settings). Read the
manual for Spyder Software for further information.
6.3 Protecting the Speakers
In general, audio signals should not be over driven. If an Ohm power amplifier is overloaded at
the output stage(clipping), the amplifier will activate a clipping warning signal. The signal must
be reduced as soon as it sounds distorted. The Ohm warranty does not cover the damage to the
speaker/s or consequential damage caused by overloading the system.
6.4 Ground loop
If the cabinet makes a loud humming or buzzing noise after the speaker has been connected,
check that there is no ground loop in the system. Some amplifiers and system controllers have
a ground lift switch. Try to set these switches to the “lift” position one after the other to get rid
of the problem. Always use a “clean” power supply for the sound, meaning that the same power
supply does not run, for example, the lighting system, which may cause interference to the sound.
It is also possible that the ground loop is before the amplifications (in mixing desk, effects or
equalizers) so all other sources need to be checked if it continues.
Never try to get rid of the ground loop by disconnecting the protective earth contact at the mains
connector! This is extremely dangerous!
Use only high-quality audio connectors and cables and if possible only balanced outputs.