Recording the sound of the ocean is difficult. We listen selectively, shifting our attention from a specific sound
or frequency, depending on a wide number of preferences and conditions, to a wider, more general broad-band sound and back again to specifics. Or, specific sound to specific sound. Back and forth. For example, with the Ocean, we might focus our hearing on the hiss of the surf because it's approaching our feet, and in the next instant, as we gaze out to sea, focus on the low roar of the wave as it impacts the shore.
Reproducing that experience in the studio requires having high-quality recordings of those same specific individual elements (the hiss, the low roar, etc) recorded as separate streams of sound. It's impossible to completely isolate one sound from another, but with the proper use of good recording equipment and later, judicious processing, a good field recordist engineer can approximate the overall sound by combining the individual elements.
