Table of Contents
Advertisement
Loudspeaker level output - XLR input
This method can be used when preamplifier outputs are not available on the surround sound
processor (a common situation on cheaper receivers). Do not connect the loudspeakers directly to
an amplifier output, as the loudspeaker's input stage will be damaged. Use the simple attenuator
design shown in Figure 5. Be sure to make all of the connections shown to minimize noise interfer-
ence. The 2-core method is preferred over the 1-core method as it gives increased noise immunity
and less signal distortion. It is important that all of the connections are made otherwise there could
be a loss of input signal level (e.g. XLR pin 3 left floating) or induced hum (e.g. chassis ground
and audio ground connected together) due to ground loops. Note: do not connect the XLR chas-
sis to XLR pin 1, as this will compromise the RF immunity of the loudspeaker's electronics. Do not
use this method on bridged amplifier designs as the amplifier may be damaged. Loudspeaker wire
should be used between the amplifier and the attenuator. Screened wire should be used from the
attenuator to the loudspeaker input. The attenuator box can be metal or plastic and one attenuator
is required per loudspeaker channel.
2.13 Operating Voltage and Power Requirements
Each Genelec Home Theater loudspeaker is delivered with a mains power cable with an appropriate
plug for that country. The active electronic and power amplifiers are meant to be connected to an earthed
mains connection (3-core mains).
Make sure that the correct supply voltage corresponding to your country is clearly indicated on the prod-
uct before switching the power ON. Because of possible supply voltage variation in certain countries and
areas, it is advisable to make sure that this voltage swing does not go beyond the tolerances mentioned
below:
Residential and Home Theater Speaker Systems operating voltage range:
Standard model (USA - Europe):
Japanese model:
If it is expected that the supply voltage will vary outside the 10 % tolerance, it is recommended that a
good quality power supply regulator is used.
2.14 Protection Circuits
Genelec active loudspeakers have custom designed protection circuits that are optimized for each model.
The purpose is to protect the drivers from severe abuse that would otherwise decrease the system's reli-
ability. The characteristic sound of activated driver protection is a short loss of high (or low) frequency or
the whole signal completely for short, but audible periods. This is not signal compression. If the customer
is often experiencing this phenomenon, the system is under specified for the required maximum sound
pressure level in this particular room. In this case, the loudspeakers should be replaced with bigger
models that can deliver the desired SPL without overloading.
2.15 Troubleshooting
Genelec has a reputation for making high quality and reliable products but occasionally 'problems' arise
that require troubleshooting. If there appears to be a problem with the loudspeaker, it is often possible to
isolate problems between the amplifiers or the drivers since the system is integrated.
If the loudspeaker is plugged in and turned on but there is no sound, the chances are that it is the ampli-
fier. If the lights are on, then it could still be the amplifier but it could also be the driver(s). When in doubt,
the amplifier of a known good system can be quickly swapped over to the problem system to see if the
drivers are working. If they are then the problem is in the amplifier.
115/230 V +/- 10 %
100/200 V +/- 10 %
17
Advertisement
Table of Contents
