MACKIE HDR24/96 - Manual (Page 214)

HDR 24/96
Use your ears and if it sounds better with the polarity flipped on the console, that’s the right way
to mix it.
The polarity of the signal through the TDIF input and output is also inverted. This, unfortunately,
is inconsistent with any generation of DTRS recorders. This is another reason why we don’t
recommend this card as a general purpose interface in a new system.
Throughput Delay (Latency)
Throughput delay for the Lightpipe I/O is 6 samples in each direction. For the TDIF I/O, it’s 1
sample.
Word Length
Unless you have a first generation DIO-8 card (these were all updated by the time the first
HDR24/96 was sold) the card passes 24 bits in and out.
Firmware Versions
There have been three firmware versions for the DIO-8. There’s a paper label on an EEPROM
chip which from which you can determine your version. When connecting TDIF ports between
two DIO-8 cards, they must both be the same version.
• Version 1 (M-109C, V 1.01) – 16-bit throughput only, SYNC output is in phase with the
word clock.
• Version 2 (Version 2, 127 Ver 2) – 24-bit throughput, SYNC output is in phase with the word
clock.
• Version 1.2 (Ver 2.1) – 24-bit throughput, SYNC output phase corrected to work with DTRS
recorders.
Mackie Tech Support can provide you with updated EEPROMs if needed.
D-Subminiature Connectors – A General Note
It’s very important to secure the cable plugs to the sockets using the retaining screws built into the
plugs. If the connectors aren’t seated firmly and secured, the weight of an 8-wire snake can pull the
connectors apart slightly causing a loss of signal.
There are two different threads used for the screws that secure D-Subminiature connectors. Mackie
uses standoffs with Metric threads. If your cables have English-thread screws, they’ll go in about 1½
turns and feel like they’re snug, but they aren’t. Some pre-made cables come with two sets of screws
to accommodate the two standards. If you have alternate screws, swap them so you can secure the
connectors. Mackie can supply you with replacement standoffs with English threads
MIDI IN/OUT
The MIDI interface card has a 9-pin D-subminiature connector. The HDR24/96 is shipped with an
adapter, which breaks this out to two MIDI DIN connectors. A common question is whether it’s
possible to use a straight through 9-pin D-sub cable to connect MIDI IN and OUT between the
HDR24/96 and the Mackie d8b console (which uses the same MIDI interface card). No, you can’t
because the wiring must be crossed over from input to output. Here’s the pin-out should you wish to
make your own MIDI cables.
HDR 24/96 214