frequency-dependent

I don't know why nobody seems to ever begin with: A filter is a voltage divider with frequency-dependent complex impedance.

But if you apply a frequency-dependent phase shift to the triangle wave, nobody will be able to tell the difference unless the frequency is very low.

Any time you want to do frequency-dependent behavior (filtering, oscillation) you need energy storing elements, usually capacitors, sometimes inductors.

Cables radiate energy, cables absorb ambient energy, cables are both capacitors and inductors (both of which will exhibit a frequency-dependent response).

In general, with low-level analog audio and non-ridiculous lengths, additive noise effects are likely to become audible long before attenuation or especially frequency-dependent attenuation.

This is a common misunderstanding of the free-space path loss formula, which is expressed in terms of the idealized isotropic radiator, the length of which is frequency-dependent.

You can design perfect boards based on solid transmission line and RF theory and have them fail to work due to issues such as frequency-dependent impedances and resonance in the PDS.

Keep in mind that you cannot hear frequency-independent attention at all (the volume knob fixes it), so you’ll only hear the frequency-dependent part, which will be smaller, and your speaker plus room already has frequency dependence far in excess of 0.1dB.

The response of materials to EM radiation and its attenuation is highly frequency-dependent (at the very high frequencies, this is why we see things having different colours), so it doesn't have to be all-or-nothing; a material could be transparent to most frequencies but appear opaque to the ones radar use - essentially, the filter absorbs all the energy at particular wavelengths.

Frequency-dependent enhancement sharpens the edges and brings it back into useful focus.