Yamaha ACU16-C, NHB32-C

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ACU16-C/NHB32-C

Owner’s Manual Addendum

Please make the following changes and additions to the ACU16-C/NHB32-C owner’s manual. Some of

these are due to the ACU16-C/NHB32-C system software upgrade, while others are corrections and

supplementary explanations.

Changes due to the software upgrade

❏Support for CobraNet “Low Latency” (system software v1.10)

In conjunction with the upgrade to system software V1.10, the latency setting that had been ﬁxed at 5.33 ms can now be

selected from three choices (5.33 ms/2.67 ms/1.33 ms). This allows even lower-latency distribution of audio signals. In

addition, you can now make connections at the desired latency to digital mixers such as the PM5D or digital mixing engines

such as the DME64N/24N via the Yamaha “MY16-C” card.

Changing the latency can be done in conjunction with NetworkAmp Manager V1.1.0E. For the procedure, refer to the

NetworkAmp Manager owner’s manual (PDF format).

The latency and audio bit depth settings will determine the limits on the number of channels that can be distributed in one

bundle, and the number of bundles that can be distributed.

• NHB32-C

•ACU16-C

If two or more different latencies exist in a CobraNet network, it may become impossible for the various devices to

communicate correctly. You must make sure that all CobraNet devices in a single network have the same latency setting.

Additions and corrections

❏Cable Length & Switching Hubs

The maximum length of a cable used in a 100Base-T Ethernet network is 100 m (a maximum of 2 km for a multimode optical

ﬁber cable), but depending on the type of cable used and on the performance of the switching hub, there are cases in which

this length cannot be guaranteed. Three or four switching hubs can be connected, but this also will depend on the

performance of the switching hub.

❏“System Requirements (NetworkAmp Manager)” (page 10)

The following items have been added to the operating requirements for NetworkAmp Manager.

•If your computer has HyperThreading Technology, you must disable it when connecting via USB.

•This software cannot be used on a computer that has multiple CPUs (e.g., Intel’s Xeon processor or AMD’s Opteron

processor).

•This software cannot be used on a computer that has a dual core CPU (e.g., Intel’s Pentium-D processor or AMD’s

Athlon64 x2 processor).

•This software cannot be used on a computer running Windows XP x64 Edition.

Latency

20-bit 24-bit

Channels per

bundle

Maximum number of bundles

(total of input and output)

Channels per

bundle

Maximum number of bundles

(total of input and output)

5.33ms 8 8 7 8

2.67ms 8 8 8 8

1.33ms 8 4 8 4

Latency Maximum number of

bundles (input only)

5.33ms 4

2.67ms 4

1.33ms 4