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Old 01-20-2009, 08:05 PM
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Default Crossover Lesson (is your passive crossover labeled correctly?)

Start with: Every passive (speaker level) (speaker wire in/out) crossover is engineered with a simple principle;
"They attenuate the signal on the positive lead."
Which means the negative is always an uninterrupted circuit.
(No breaks. Negative in is negative out. No Exceptions)
The low pass circuit of a 12db or higher high pass circuit will cross to the negative but the integrity of the paths are not compromised.

The problem is Aesthetics. (how pretty it is)
The silk screen people know nothing of circuit design and layout or how to follow the path.
All they care about is that it looks nice. So when they label it they follow symmetrical layout and totally mess up your sound. But they don't care, it's their job to make it look nice.

Companies on the list of crossovers I have inspected and know polarity or multiple polarities have been reversed on: Infinity, Old School MB Quart Musiccomp, SAS Bazooka, Alpine.

The only crossover I have inspected to date which did not have this problem was made by Polk Audio. It was a Momo series.


All you need to know is that the negative never changes. Oh and, if it doesn't sound like -6db occurred, the tweeter attenuation might be labeled in reverse order as well. Negative 6 might give you positive 6 from where you started.

Here is why I mention all this: When two drivers are out of phase they cancel each other even if it's just a tweeter and a midrange.
(It will sound better if you fix it by wiring them true to the circuit rather than the screen print.)

You can test the negatives with a meter set to continuity. The true negatives will be close to 0.004 for continuity.

Also you can use a double-A battery to test midbass and midrange speakers. {when your speakers are connected correctly, they will move outward when the speaker wire is touched to the ends of the double-A battery. (the positive lead wire will be the one connected to the + end of the battery when the cones move outward)}

Double-A batteries produce about 1/2 watt when connected to a 4ohm speaker. It is Direct Current but no where near enough to hurt the speaker.



Last edited by iamsonic; 11-28-2009 at 09:36 AM.
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