A common trope with technologically advanced races is the lack of a need for speech. Machine races that self optimise usually forgo spoken languages all together, instead opting for completely wireless communication. The best example is a race of sentient robots that have modified themselves over the course of generations to the point of being super advanced. By that logic they wouldn't need to speak and therefore wouldn't have speakers. If speaking was meant to serve as backup for when they are disconnected or when there's too much static, then wouldn't things like flashing lights be better? Much faster and doesn't require an atmosphere. Alternatively they could plug in to transmit data or something along those lines.
So how would a robot that isn't designed for speech, make comprehensible sounds to converse with their inefficient organic counterparts? What would they sound like?