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02-10-2011, 11:48 AM
|  | Registered User | | Join Date: Dec 2002 Location: Central Alabama | | | Determining Bridge Mode Polarity with a Crest 3001
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I own one. Of course, - and + are are clearly marked for each channel (in addition to the color coded banana plugs.) Bridge mode is not. It indicates that you use both + terminals but it does not say which should be - or +. Does it matter with this amp? |
02-10-2011, 12:14 PM
| | Registered User | | Join Date: Sep 2010 Location: Czech Republic | | Quote:
Originally Posted by Stinsok  I own one. Of course, - and + are are clearly marked for each channel (in addition to the color coded banana plugs.) Bridge mode is not. It indicates that you use both + terminals but it does not say which should be - or +. Does it matter with this amp? | - and + are marked for each channel (even though the output is AC) to make sure you get the two in phase - so both speaker cones move in and out together. In bridge mode you'll be running into only one cab so phase is not relevant. |
02-10-2011, 01:10 PM
|  | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | | Channel A is + (or "in polarity"), and Channel B is - (or "inverted polarity").
Pin 3, IIRC, is hot, or +. |
02-10-2011, 01:21 PM
| | Registered User | | Join Date: Jan 2008 Location: Westfield, MA, USA | | Quote:
Originally Posted by Bob Lee (QSC) Channel A is + (or "in polarity"), and Channel B is - (or "inverted polarity").
Pin 3, IIRC, is hot, or +. | In other words, if you want it in phase with almost anything else in use today channel A goes to the negative terminal on the speaker box and channel B to the positive.
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02-10-2011, 01:35 PM
| | Registered User | | Join Date: Dec 2002 Location: Central Alabama | | | wait...you guys are saying the opposite of each other. |
02-10-2011, 01:37 PM
| | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | Quote:
Originally Posted by projectMalamute In other words, if you want it in phase with almost anything else in use today channel A goes to the negative terminal on the speaker box and channel B to the positive. | Yes.
That's why I added the bit about the XLR input polarity. |
02-10-2011, 01:40 PM
|  | Registered User | | Join Date: Mar 2009 Location: Bothell, WA | | | What would happen with polarities reversed? If channel one on the amp was on the + terminal of the speaker cable, and two on the negative? |
02-10-2011, 01:42 PM
| | Registered User | | Join Date: Jan 2008 Location: Westfield, MA, USA | | Quote:
Originally Posted by Balog What would happen with polarities reversed? If channel one on the amp was on the + terminal of the speaker cable, and two on the negative? | Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.
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