In which way the capacitor modify the things in this Speaker arrangement ?

[kagliostro]

In simple HiFi (or music reproduction) Speaker cabinets often there is a pair of Speaker one for Lower frequencies and other for Higher frequencies

The most simple arrangement don't use a real Crossover unit with inductors and capacitors, only one capacitor is series with the High frequency speaker is used



What I don't know is ... in this simple arrangement which is the resulting impedance of the combined Speakers ?

If I put two 8 ohm speakers in parallel I know I obtain a virtual 4 ohm speaker

But when there is a capacitor that cut frequencies like in the schematic, what happen to the resulting impedance of the coupled speakers ?

Many Thanks

Franco

[shooter]

the simple answer is "it's still 4 ohms"  otherwise you have to do speaker math over frequency range, plotting on log paper with slide rules n such 

[mresistor]

The cap is there to keep low frequencies from reaching the tweeter ( or high frequench driver if you want to call it that ) and damaging it - of course you probably know that already


Shooter has it right I believe.

[PRR]

All voice-coil speakers have rising impedance above midrange.

These one-cap "crossovers" usually start past the woofer's midrange, where its impedance is near double or more.

Also you don't put a lot of power above ~~1KHz so the amplifier won't strain into a "wrong" impedance.

So yeah, what Shooter said.

[kagliostro]

Many thanks friends

Franco

[PRR]

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