Ships can be readily identified by the sound of their engine, but a frame-shift drive is a frame-shift drive is a frame-shift drive, aurally.
They'd benefit if each class had its own sonic signature; smaller drives would be whiny, high-pitched devices, while massive ones ought to have a deep, resonant thrum. Different grades of the drives would have subtle variations on the class' 'theme'.
Engineering tweaks could further adjust the signature, maybe making the sound quieter, or warbly, or fraught with tension...?
They'd benefit if each class had its own sonic signature; smaller drives would be whiny, high-pitched devices, while massive ones ought to have a deep, resonant thrum. Different grades of the drives would have subtle variations on the class' 'theme'.
Engineering tweaks could further adjust the signature, maybe making the sound quieter, or warbly, or fraught with tension...?