What's wrong with my amplified ear circuit?
Audio equipment is not supposed to transport low frequencies like 1 Hz. In fact, you could ruin your speakers/headphones with that. Try 100 Hz or 1 kHz for the AC source, as most caps work as high pass filters.

Q4 is not correctly connected for a class A amplifier. Oscilloscopes have a high impedance (1 Megaohm) typically, the simulated one may well be infinite. A BJT cannot work without current flow.