I want to hook up a an interface to a mackie mixer. What is the common denoinator to hook up, let's say a digi 002 and a mackie mixer so i can have a mac computer with pro tools operational with also the mackie mixer running. Where do I hook up Interface to Mackie Mixer inputs & OutPuts.

It depends on what I/O is available on your PC. If it has an analog input (typically a stereo 3.5.mm connector), you can connect that to the mixer's Tape Out connections (cable needs 2 RCA plugs on one end, 1 3.5mm stereo plug on the other).

If the PC only has USB or Firewire connections, you need a computer interface. Something like an M-Audio M-Track or PreSonus AudioBox USB. Connect from the mixer Tape Out to the line inputs on the interface. Connect USB (or Firewire) from the interface to the PC.

Here is the official AVID page regarding the digi 002 drivers: http://avid.force.com/pkb/articles/en_US/Download/Digi-002-003-Drivers

Just use balanced audio interconnect cables (XLR or TRS) between the mixer and the M-Audio interface.

Unlike some RME products, the 002 rack has no ability to run as a standalone mixer. All routing/mixing is controlled via the pro tools software.

The Mackie 1620,1640 or 1220 mixers are designed to be used with this card. Here is a link for you:http://www.mackie.com/products/onyxfirewire/

Try hooking your mixer up to your Mackies without the laptop. Does the hum go away? Try hooking your laptop output up to the Mackies without the mixer. Does the hum go away? Make sure that all your power cables run from the same outlet and have the ground or third pin intact on the plug. Also make sure that you are using shielded cables for any connection that carries an audio signal. This includes the cables going to your Mackies as they are powered amplified monitors. Make sure that the cables to your Mackies are balanced and haven't been altered to unbalanced. You will need to use unbalanced cables from your laptop unfortunately but try to find ones with a shield and three conductors ( right and left signals and a common or ground) that have a separate shield from the common. The shield should only be connected to common at the output of the device where the signal starts. A better explanation is at these links:http://www.epanorama.net/documents/groundloop/ also http://www.epanorama.net/documents/groundloop/cable_shielding.html

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how you hook up a mixer

how u hook up a mixer