Há um slot de carregador para o som no console TARDIS.
Pelo menos nas Décima Primeira e Décima Segunda Doutora TARDIS.
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No especial de Natal de 2013 "Time of the Doctor" (grifo meu):
DOCTOR: A question only I could answer. A truth field to make sure I'm not lying. If I give my name, they'll know they've found the right place and that it's safe to come through.
CLARA: The Time Lords? Okay, so what then? If you answer the question and they come back, what happens?
(The Doctor gives Clara a short round device.)
DOCTOR: Er, you need to take this to the Tardis and put it in the charger slot for the sonic.
CLARA: Why?
DOCTOR: Hell. All hell, that's what happens if the Time Lords come back. There's half a universe up there already, waiting to open fire. Now please, go to the Tardis and just do as I say.
(Clara runs.) -
E no final da série 9 "Hell Bent", vemos o material sonoro se materializar no slot do carregador antes de voar para a mão do Doctor: