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DD12
USER GUIDE
U-NET
When a networked system with multiple DD12s requires long cable runs – possibly including
other Martin Audio network devices - the dedicated U-Net Bus must be used as opposed
to USB, which is only suitable for short cable distances up to 5 metres. Connections are
made using Cat 5 cables fitted with 8-way push-pull latching connectors compatible with
Lemo Series K type. Robust Cat 5 cable such as Neutrik® Etherflex or Belden 1305A
should be used; this will ensure reliable network connections of up to 125 metres between
network ports. U-Net uses a redundant ring fault-tolerant protocol, so connections are
"daisy-chained" between all units on the network, going from Port 1 on the first unit to Port 2
on the next, and so on. The last network link is back to Port 2 on the first unit, thus completing
the loop. The U-Net network will operate perfectly well without a closed loop but it is strongly
recommended to use this option so that the network will continue to work in the event of a break
in cable or disconnected connector.
Ready made tour-grade network cables are available as accessories from Martin Audio in a
variety of lengths, suitable for inter-cabinet patching to FOH-to-stage runs.
GETTING STARTED
Before deploying the DD12, decide on the method of rigging to be used; please see "Rigging" on
page 19 for details of rigging options. If the cabinet is to be ground stacked or pole-mounted
it can be rigged completely before connections are made. If the cabinet is to be flown, it will be
necessary to make connections as rigging is carried out.
While attaching cabinets to a scaf pole or truss, the mains, network and audio connections
must be made. We strongly recommend using the Martin Audio mains distribution system which
greatly simplifies mains wiring and keeps the wiring neat and tidy. In all cases, the wiring to
the cabinets must be secured to the grid above if flown and the connections dropped down to
each cabinet. This ensures that the weight of the cable loom does not put undue stress on the
connectors. Each mains connector should be plugged into the mains inlet.
The U-Net network cable should be connected to the first co-located cabinet and short linking
cables used to "daisy-chain" between adjacent cabinets. Finally a long U-Net cable should go
from the final cabinet in the group to the next device on the network. This could be more DD12s
on the other side of the stage, other U-Net enabled speakers or amplifiers, or a Merlin controller.
Audio connections can be made in the same way, with a feed from the signal source connected
to the input of the first cabinet and short linking cables going from the Link output to the input
of the next cabinet.
When many DD12s are in use, or when they form part of a larger system (typically of MLA, MLA
Compact or MLA Mini cabinets), Display 2.1™ and Vu-Net software can be used to calculate the
physical parameters for the system. This data can then be applied to give the optimum coverage
for the venue. Vu-Net also offers comprehensive equalisation and monitoring so that all aspects
of the array performance can be adjusted and analysed.
DD12 User Guide V1.0
18
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