Exceeding these limits may result in lost contact
with the devices, or loss of phantom powering due
to cable resistance.
Q
: How long can cable-runs be on the Ethernet
network connecting the NLB 60E to the PC?
A
: On the Ethernet side, normal Ethernet cable limits
apply. This is typically a maximum of 80 meters / 300
feet between each device. Follow standard installation
p r o c e d u r e s f o r E t h e r n e t . D i s t a n c e s b e y o n d
100 meters may require use of a repeater, a format
converter, or optical cables.
Q
: How can I be sure that no protection circuits or
safety functions interfere with the output signal?
A
: If no Clip or Warning LEDs on the front panel light
up, you can be fully confident that the rated maximum
output power in the full frequency range is available
for your speakers. No limiting or gain-reduction takes
place without a warning or fault indication.
7.1 Maintenance
During normal operation your MM Series amplifier
will provide trouble-free service. The only user main-
Tenance required is to periodically vacuum clean
the foam dust-filters behind the front grille.
In some extreme cases it may be necessary for
authorized service personnel to clean the inside of
the amplifier. These conditions usually occur after
prolonged use in extreme environments such as
those using
“
cracked oil
”
smoke machines. If you
are using your amplifier in a heavy duty application,
it is recommended to have your amplifier serviced
every 3 years purely as a preventative action.
7.2 F AQ
Following are common questions asked about
MM Series power amplifiers together with helpful
answers.
Q
: What is the input sensitivity of the amplifiers?
A
: Input sensitivity is calculated from the amplifier
gain, maximum output voltage and load. As gain and
output voltage is adjustable in MM Series amplifiers,
you need to look this information up in a table found in
the Appendix section of this manual. Input sensitivity
also is automatically calculated in the Device Control
software application.
General rules of cable lengths:
The maximum cable length in between any
two devices may not exceed 300 meters / 980
feet.
In a non-closed-loop daisy-chained subnet the
maximum cable length is 400 meters / 1300
feet.
In a closed-loop subnet the maximum cable
length is 700 meters / 2300 feet.
MM Series Operation Manual 23
