In a modular holder for supporting an apparatus or instrument such as a minicomputer or a cell phone, comprising a support member with a support head and an apparatus holder supported thereby, an intermediate box is releasably mounted with one side thereof by an engagement structure onto the support head and the apparatus holder is releasably mounted by an identical engagement structure onto another side of the intermediate box and the intermediate box includes at least a loud-speaker for transmitting sound generated by an apparatus engaged by the apparatus holder.