"Larger" meaning which ones?
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Like these. Taken from the internet.

The Regency would be one.
https://products.electrovoice.com/binary/Regency Manual.pdf
For the life of me, I can't figure out why someone would mount the tone controls there. They've completely defeated the purpose of a corner horn cabinet, by making them unable to be placed in a corner.![]()
I have a single that looks exactly like yours. It’s an EV Aristocrat lll.
If it’s original inside it should have a woofer and two horns.
Here is a picture of mine.View attachment 2738725 View attachment 2738726
I think there was supposed to still be enough space between the wall and speaker to adjust these. You wouldn't place them touching the corners.
The spacing between those angled panels and the wall is supposed to be 1"-4". It's a really awkward spot to put those controls, when they could have easily been put on the flat side just forward of where they are, and where they would be readily accessible. Those knobs probably stick at least 1.5". EV tone control knobs are big.