There was one available as part of the "A" & "B" harness. I don't think they were very common.
WftW Compendium 2 shows that an ALS19 (apparatus loudspeaking 19) was required. This was an external audio amplifier that drove up to 3 speakers. The speakers were Loudspeaker PM 5" or Loudspeaker PM 3 1/4".
The C42 didn't drive a speaker by itself.
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