What will the impedance be? And can I put a ~4mH inductor between them to low-pass the bass at around 120 Hz without affecting the mid?
Resistances add in series, but you're not dealing with plain resistance. You can make the blanket statement that it's going to be higher than either driver on its own or guesstimate that the impedance rating would be around 6.5 ohms. Because impedance varies with frequency, you actually need the full impedance vs frequency data for each driver to definitively say.
If you put a coil in circuit like you show, it's going to affect both drivers. If you want an actual series crossover, you need something like this:
https://www.tubecad.com/2017/11/blog0402.htm
And units for the inductor (L) should be mH, for millihenries.
If you put a coil in circuit like you show, it's going to affect both drivers. If you want an actual series crossover, you need something like this:
https://www.tubecad.com/2017/11/blog0402.htm
And units for the inductor (L) should be mH, for millihenries.
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For first order, basically yes. But the series values can also be adjusted to modify individual driver behavior in the overlap region (in a way that still sums flat electrically). That's an interesting benefit or frustrating detriment depending on what you are trying to accomplish. Dealing with inherently unruly frequency response is much easier in a parallel crossover. But component inaccuracy has less impact in a series configuration, since it basically rebalances itself.
Impedance and phase angle are also impacted when you get away from the typical values, so that has to be watched as well.
Impedance and phase angle are also impacted when you get away from the typical values, so that has to be watched as well.
Yes, the interaction between these components can be both helpful and not. It is possible to manage each driver separately if you give it some thought. A simple example is adding an L-pad to the tweeter.
Yeah, love 1st order, but needed to use a pot to dial them and replace with fixed resistor IME.