Cap accross terminals...why?

[Tom Loizeaux]

I am re-habbing a commercial sound column and see that they put a 13uf cap accross the speaker terminals!
What does it do?

Thanks,

Tom

[boputnam]

.

[Robh3606]

Maybe it's acting like a Zobel and is counteracting the voice coil Inductance??? There a crossover in there?? An Inductor in series so that's a crossover pole??? You have a driver part number I can throw into Bass Box???

Rob

[frank23]

if they put it at the speaker terminals of the cabinet, it would have the effect of shorting your amplifier output above a certain frequency. That would not seem like a smart thing to do.

it could only have worked as a crossover if there was an inductor or resistor between the amplifier and the capacitor in either the + or - wire

if it would have been a zobel, shouldn't there have at least been a resistor in series with the capacitor in between the speaker terminals?

frank

[Zilch]

If it's after a passive crossover, it's just adding another pole to the filter.

If on the woofer and properly chosen, it would steepen the slope of the lowpass.

[boputnam]

if they put it at the speaker terminals of the cabinet, it would have the effect of shorting your amplifier output above a certain frequency. That would not seem like a smart thing to do.

That's the direction my " . " post was headed, but the thing doesn't make sense to me.

[P.Warner]

If that capacitor value was series wired, that would seem typical for a PA speaker high pass. Could somebody have rewired it?

[4343]

If that capacitor value was series wired, that would seem typical for a PA speaker high pass. Could somebody have rewired it?

If TWO woofers are wired in series, a cap across one will pass the highs to the other woofer.