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Post by bigjon on Dec 6, 2011 15:55:01 GMT -7
I have embarked on IB #2 and have been taking pictures for my upcoming project thread!
Unless my methods are flawed, the new IB318's I purchased have reversed polarity in relation to their terminal markings. Can somebody confirm my test method is correct?
1. Briefly touch 9v battery to voice coil terminals (would use AAA for smaller speakers):
- small male 9v terminal (positive) to IB318 positive (+) terminal
- large female 9v terminal to IB318 negative (-) terminal.
2. Cone pulls in toward magnet - shouldn't it push out away from the magnet when polarity is correct?
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Post by maxserg on Dec 6, 2011 19:10:30 GMT -7
Your polarity is ok when all drivers go in the same direction unless you have inside and outside manifold. but in the end you have to get in phase your mains and your subs  |
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Post by FOH on Dec 7, 2011 11:06:19 GMT -7
I have embarked on IB #2 and have been taking pictures for my upcoming project thread! Unless my methods are flawed, the new IB318's I purchased have reversed polarity in relation to their terminal markings. Can somebody confirm my test method is correct? 1. Briefly touch 9v battery to voice coil terminals (would use AAA for smaller speakers): - small male 9v terminal (positive) to IB318 positive (+) terminal - large female 9v terminal to IB318 negative (-) terminal. 2. Cone pulls in toward magnet - shouldn't it push out away from the magnet when polarity is correct? Are you saying you already possess a set of IB3-18's, and now a new set recently purchased has a different polarity than the old set? |
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Post by bigjon on Dec 8, 2011 13:55:29 GMT -7
I have only one set of 4 [new] IB318's, all are the same polarity. I don't know whether the polarity is the same on the older Fi model. Other (non-Fi) speakers I have tested push out with correct (positive) polarity, so I was surprised when these pulled in (toward the magnet).
Maybe it's not unusual, but I always thought (assumed?) that speakers push out away from the magnet when current is applied with correct polarity.
I guess it goes without saying that it is a good idea to always check polarity when adding a speaker and don't assume a speaker is in phase with your other speakers based on terminal markings.
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Post by FOH on Dec 8, 2011 16:33:40 GMT -7
It just depends on the directional aspects of how the coils are wound. And that's way, way back to the beginning,...physics of electricity. Lorentz' Law, and the Right Hand Rule. As long as they're all the same (drivers), that's what matters. Polarity could be switched a hundred times arbitrarily, any number of locations between the microphone capsule,...and the loudspeaker.
Good luck
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danny
New Member
Posts: 9
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Post by danny on Dec 8, 2011 18:18:08 GMT -7
I just bought 4 18s from Fi. They were all backwards, that is red is actually negative.
I tested them, questioned myself (late in the day after the ib install) but ran my amps audessey eq. It flagged them as being reversed.
Listened to them briefly like this, switched them and they sounded much better.
going off topic a bit, I don't usually trust colors for polarity markings. in the dc and electronics world, red is usually +, black - ... this is where my schooling/ background is, but I now work as an industrial inst tech, and I see alot of electricians wiring dc as black +, because in AC, black is hot. North american thermocouples are always red negative. I test first, then take solice that nearly every thing nowadays has a series diode for when we hooking things up at the end of a long day......
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Post by maxserg on Dec 8, 2011 19:52:37 GMT -7
Yes in ac black is the load or hot and in dc there is real+ (red) and black is the- I to find that confusing  |
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Post by paul08 on Dec 30, 2011 0:51:58 GMT -7
Just checked my new FI 18's, all five are backward. Would have figured it out when I started crossing them over but what a vacuumout that would have been at the xover. Thanks for the heads up on that one
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Post by severianb on Mar 11, 2012 14:15:51 GMT -7
Tested the ones I just got yesterday (IB3 18", 4ohm) and all 4 are as the rest of you have described. Seems that FiCar is very consistent with this. Red is negative and Black is Positive. Good to know! Not taking anything away from these drivers. I'm sure it's not a mistake, as they are all wired this way, and the workmanship is quite good on these. |
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