Anyone heard of series crossovers?

**Lawrence001** · 17-12-2018, 15:53

I've just bought these speakers and the seller said they have a "series crossover based on the Acoustic Reality model". I said I would like a bit more treble and he suggested I can change the Caddock resistor, but I can't see one. What's the thing that looks like a transistor (but with 2 legs) on a heatsink? Actually I can't see a capacitor either...

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**YNWaN** · 17-12-2018, 16:27

There is a resistor, an inductor and a capacitor (doh, no there isn’t), all good quality. The top left is the capacitor (nope, it is an inductor - obviously!), the lower middle is the inductor and the thing attached to the heat sink is the resistor.

**Lawrence001** · 17-12-2018, 17:06

And I thought there were two inductors, shows what I know! I didn't know they made resistors like that either, it's smaller than usual, are they made out of silicon rather than whatever the bigger ones are?

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**struth** · 17-12-2018, 17:16

film power resistor i think

**Lawrence001** · 17-12-2018, 19:13

If anyone can guess the circuit from looking at the 3 components, is there a simple way of increasing the output from the tweeter (or padding down the mid bass)? Alternatively, could it reverse the phase of the tweeter, so I could try switching the tweeter wires around?

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**YNWaN** · 17-12-2018, 19:22

Apologies, of course there are two inductors and no capacitors at all. That’s the problem with assumption - I presumed there was a capacitor is series with the tweeter as this is usual.

**YNWaN** · 17-12-2018, 19:43

Looking closer the red inductor has 2.00 mH printed on it so I guess that is in series with the woofer. Yes, it looks like the foil one is across the tweeter.

**Macca** · 17-12-2018, 19:57

How does it work without a capacitor? Why does the tweeter not blow?

**Firebottle** · 17-12-2018, 20:09

Because the inductor is a low impedance at low frequencies, as opposed to a capacitor being a low impedance at high frequencies, and the inductor being in parallel with the tweeter.
If a capacitor is used it is in series with the tweeter.

**Macca** · 17-12-2018, 20:13

Originally Posted by Firebottle

Because the inductor is a low impedance at low frequencies, as opposed to a capacitor being a low impedance at high frequencies, and the inductor being in parallel with the tweeter.
If a capacitor is used it is in series with the tweeter.

An inductor won't protect the tweeter from receiving LF though which is why you need the capacitor. So what stops LF going to the tweeter?

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Anyone heard of series crossovers?

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