/sci/ - Science & Math

Tested this circuit in lab today. The 6 Ohm resistors are actually speakers (didn't know how to properly model them).

For the life of me, I can't seem to fully understand what function the capacitor serves. I tested it on a frequency ranging from 1 Hz to 10kHz, and at around 1.3kHz and 1.5 Hz there was a jump in voltage amplitude dropped across the capacitor. Between 1.5kHz and 1.9kHz it the voltage amplitude went back to where it was before and stayed there.

I just started doing electronics (as you can obviously tell) but increasing the frequency will decrease the impedance in the capacitor, right? If that's true then as I increase the frequency more current should pass through the capacitor as compared to the speaker and since the capacitor has no (or negligible) resistance then the voltage dropped across the parallel combination should keep dropping as I increase the frequency. But it doesn't really. If I jack up the frequency then the voltage drop actually increases as I start moving into the MHz territory - is this because of parasitic effects in the wires themselves?

Sorry for all the noob questions.