large
奕 centers on largeness or grandeur, often with a sense of abundance or imposing scale.
奕 combines 亦 (also) with 大 (big), but the historical development is uncertain. It may have originally depicted something large or abundant, though the exact origin is not clear.
The top 亦 looks like a doubled shape, and the bottom 大 means big. Imagine something so large it has to be doubled just to fit: 奕 is large.
For エキ, picture a huge, echoing hall: the echo sound 'eki' cues エキ, and the hall is so large that every sound bounces back.
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