Some boxes joined together with wires

[Lawrence001]

They look like IMFs. But then I suppose IMFs do look like cupboards.

There's a piece of wood dividing what could be speaker grilles a third of the way down, so it's not a pair. If they were speakers they would probably be a separate high/mid and bass cabinet, but then they look too old to have that, unless they are a diy design far ahead of their time. Hopefully we'll find out soon.

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[mikmas]

There's a piece of wood dividing what could be speaker grilles a third of the way down,

Yep - hinge of the pull down leaf ... it's a bureau type thing (currently crammed full with assorted crap and redundant remotes)