Whether you use a stand-alone equalizer, or the equalization function in iTunes, you can set your equalization to match most of the tango music which we usually use. It is wise to listen to each song you use, to see if further equalization adjustments are needed, but this procedure will get you a good general-purpose equalizaton:
When I followed this procedure, I ended up with these settings:
To get the full grasp of the meaning of these settings, I would recommend reading the post from El Espejero, and following the procedure. To start out gently, though, you might just copy these settings that I got; use the “On” box to turn the equalizer on and off and check out the effect.
Some songs need further equalization adjustments; I started with this setting for most songs, and then set up some patterns customized for individual songs that needed it. In iTunes the equalization pattern is stored, and called up when that song is played, so you don’t need manual adjustments during the milonga – if you’ve set it up right.
Here’s another opinion on the equalization issue:
“Ricci Adams Simplest way: buy a dbx DriveRack PA2 (or similar, like the above-mentioned venu360) and its corresponding microphone, then auto-EQ the room. I do that, but also use a UMIK-1 and FuzzMeasure to manually tweak the DriveRack’s curves.”