Driver

12:31 Aug 17, 2018 

You didn't ask for "Driver diameter", but for "Driver".
You've got the translation for "Driver", not for "Driver diameter" correspondingly.
No problem to translate "diameter" and to add.

06:14 Aug 17, 2018 

Note that in EN, 'speaker' (or more formally 'loudspeaker') is used in several different ways:
Can refer to the whole device as a concept: "a pair of speakers to connect to my stereo system". In FR, these are more correctly referred to as 'enceintes' — i.e. the 'enclosure' (term also used in EN) as a whole; informally, also referred to as 'baffles', which in fact probably predates the other, since in EN too 'baffles' were being used long before anyone thought of actually 'enclosing' them!
On another level, 'speaker' can also refer to the (usually) electro-mechanical 'transducer' that actually converts the electrical signal into an aucible acoustic one.
Because this term has these two meanings, the more technical term 'driver' has been coined more recently to refer to this transducer — particularly relevant with modern speaker designs, where there may be 2 or more 'speakers' (= drivers) within a single 'speaker' (= enclosure / cabinet)!
Hence in a context like the present, there is a need to differentiate between the whole unit ('enceinte') and the individual speaker or driver that makes it work ('haut-parleur' or 'moteur') — it's the latter we're dealing with here, of course.

19:39 Aug 16, 2018 

I did, but maybe not in the right place. Kindly show me where the answer is for future reference.

19:34 Aug 16, 2018 

Did you try a term search before posting your question? I know for sure we've had exactly this term before in the same context, where it was discussed pretty fully — which would have answered your supplementary question!