Lab.gruppen C Series 88:4 - Manual (Page 34)

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6. Appendix
C Series C 88:4, C 68:4, C 48:4, C 28:4 and C 16:4 Operation Manual rev 2.2.3
6. Appendix
6.1 Maintenance
During normal operation your C Series amplifier will provide trouble-free service. The only user maintenance
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 ampli-
fier. 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 three years purely as a preventative action.
6.2 FAQ
Following are common questions asked about Lab.gruppen C 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 C 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 DeviceControl software
application.
Q: What are the maximum cable lengths allowed when using the NomadLink network?
A: NomadLink uses a daisy-chain topology to connect amplifiers and an NLB 60E in a network. Standard
RJ45-equipped Cat-5 cables are used throughout. The daisy chain may be made into a closed-loop by con-
necting a return cable to the NLB 60E from the last amplifier.
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.
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 procedures for Ethernet. Distances beyond 100 meters may
require use of a repeater, a format converter, or optical cables.
Q: Why is the NomadLink network a closed-loop topology?
A: Technically speaking, the closed loop is optional. The purpose of closing the loop is primarily to provide a
secondary path to the amplifiers. If cables are broken or disconnected in either direction, all amplifiers still may
be addressed by the network.