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Reid
Ha`aha`a

Andorra
1526 Posts
Posted - 03/16/2006 :  07:25:17 AM  Show Profile
Ultra-simplified quick explanation (I gotta do my taxes :-(

DI (Direct) just means that the signal is changed from unbalanced to balanced so you can have long cable runs without (much) loss.

Unbalanced means the cable just has signal and ground (essentially) - which is conducted over a TS (Tip-Sleeve) connector cable from your guitar to the box (look at the connector). Balanced means that there are 3 wires in the cable (there are a couple of ways to do that: TRS - R means Ring -or XLR connectors)a ground plus two signal wires. Arithmetic can be done (analog arithmetic, too) - in a couple of ways - on the 3 wires so that noise gets subtracted from the signal and inevitable transmission losses are minimized.

I gotta go mess with the IRS. If anybody wants to deunclarify what I wrote, feel free.

...Reid
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Mark
Ha`aha`a

USA
1628 Posts
Posted - 03/16/2006 :  09:33:35 AM  Show Profile  Visit Mark's Homepage
quote:
DI (Direct) just means that the signal is changed from unbalanced to balanced so you can have long cable runs without (much) loss.


More or less.

DI actually stands for "Direct Injection." The idea is to use a DI (AKA Direct Box) to change the impedence so you can plug a Hi Z source -- like a guitar or bass -- into a lo Z input on mixer. As a side benefit, you get the long cable runs.

For anyone interested in this stuff, I'd suggest checking out the excellent online "Word of the Day" and "Tech Tip of the Day" archives at Sweetwater.com:

http://www.sweetwater.com/insync/word.php

http://www.sweetwater.com/insync/techtip.php

Or you could just read my dang book. http://www.mark-o.com/

Sorry, I forgot to add the dang smiley so no one would think I was mad, or anything. Here it is:

Written communication is soooo easy to misinterpret. I wonder how earlier generations got along without emoticons??

"Chapter One: I am born. "

"Call me Ishmael. "

"It was a dark and stormy night. "
Edited by - Mark on 03/16/2006 4:22:43 PM
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slackkeymike
Lokahi

440 Posts
Posted - 03/17/2006 :  02:14:43 AM  Show Profile
Well, I bought the book...does that count?

Thanks all, I don't know where I got the idea that DI stood for digital interface...

Mike
Aloha, Mike
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