Sorry but that looks dreadful.
Maybe there used to be something where the box is - photocell or PIR for example.
Although he could have used a black box...
How much are you looking to spend on the project?
As another user above suggested I would use Pyro if I wanted a sound install that will last for years!
You Could pick up 100m of 2L1.5 enough Glands/Pots/Seals for about £300.
And if you've never used pyro/have to buy all the tools/learn how to work with it?
Not saying it's not a valuable skill, but I think a bit OTT for a DIY job.
The reference to "male adaptors" would seem to confirm your belief.You're talking abut PVC conduit, aren't you.
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