Unofficial Mackie User Forums > Speakers
C300z - phase inverted?
lightguy48:
Just curious if anyone has ever run a phase test on these cabinets.
When I tested mine, compared against a Yorkville and a Peavey cabinet my speaker 'pinger' always tests it as being out of phase compared to other speakers.
I'm thinking I should just swap the wires on all of the speaker leads internal to the cabinet.
Greg C.:
--- Quote from: lightguy48 on June 19, 2014, 02:01:06 AM ---Just curious if anyone has ever run a phase test on these cabinets.
When I tested mine, compared against a Yorkville and a Peavey cabinet my speaker 'pinger' always tests it as being out of phase compared to other speakers.
I'm thinking I should just swap the wires on all of the speaker leads internal to the cabinet.
--- End quote ---
What polarity tester are you using? Do have a pair or just a single c300? When testing polarity of a full range cabinet, you have to be careful since all drivers are going at once and you can get false readings. The only way to be certain the the entire cabinet/both drivers have reversed polarity is to test each driver one at a time. So you'll need to open up the cabinet and disconnect the horn and test just the woofer. Then disconnect just the woofer and test the horn. If they're both on at the same time, the output of one driver might overpower the other even if you have the polarity checkers mic aimed at the driver you're trying to check.
lightguy48:
Well I performed an old fashioned test with a AA battery comparing to several speakers that tested 'in phase' and they all tested the same, + to the + pushed the woofer out, so I'm not sure why my AudioTools Speaker Polarity tester is showing inverted.
I'm going to have to send them an email and see what they say.
Greg C.:
--- Quote from: lightguy48 on June 28, 2014, 09:50:21 PM ---Well I performed an old fashioned test with a AA battery comparing to several speakers that tested 'in phase' and they all tested the same, + to the + pushed the woofer out, so I'm not sure why my AudioTools Speaker Polarity tester is showing inverted.
I'm going to have to send them an email and see what they say.
--- End quote ---
What about the horns? It could be the one box has inverted polarity just on the horn (which will cause a frequency "suck out" from cancellation in the crossover area). The visual battery test won't work for that. If you contact the app guys, they're probably just going to tell you that polarity testing on 2 drivers at the same time will give sketchy results.
P.S. phase is not the correct term when referring to polarity.
lightguy48:
Except why would my Yorkville's and some old Crate cabinets all show the polarity was correct?
Just odd....
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