A perfect speaker is the one with zero harmonic distortion, ruler flat frequency response from 0Hz to 100KHz (some may argue it needs to go even higher), zero phase shift, 360 degree uniform dispersion, unlimited dynamic range, 100% linearity and 100% efficiency.
At the current state of technology, no speaker even come remotely close to any of these properties and I doubt I will see one in my lifetime.
At the current state of technology, no speaker even come remotely close to any of these properties and I doubt I will see one in my lifetime.