One single image containing a 2x2 grid of four separate premium 4:5 vertical headphone advertising posters, thin clean white gutters between them, bold commercial layout x surreal realism, 8K. Each poster is a complete independent design with its own fictional brand, rounded color block background, giant cropped typography behind the subject, one subject holding headphones toward the camera in foreground-dominant perspective, a surreal twist coming out of the headphones, graphic elements, a top pill label and a bottom feature strip. All people and brands are fictional and no person resembles any real individual.POSTER 1 (top-left), brand PULSEWAVE, idea "SEE YOUR SOUND."Background: large rounded rectangle in electric violet. Giant typography: "PULSE" in bold white condensed letters, cropped, behind the subject. Subject: fictional young man in his mid-twenties, short fade haircut, black hoodie, eyes closed with a blissful smile, holding matte black over-ear headphones with violet light rings toward the camera. Surreal twist: sound waves pour out of the ear cups as glowing ribbons of violet and pink liquid light, forming equalizer bars that rise around him like a glowing city. Elements: sparkle icons, light particles, soft haze. Text: top pill "Pulsewave", small text "Studio Series", bottom strip "ACTIVE NOISE CANCEL / 40H BATTERY / DEEP BASS / HI-RES AUDIO".POSTER 2 (top-right), brand ECHO FORGE, idea "HEAR THE FIRE."Background: large rounded rectangle in burnt orange. Giant typography: "FORGE" in huge cream condensed letters, cropped, layered behind the subject. Subject: fictional woman in her late twenties, short curly hair, leather jacket, intense gaze, holding rugged orange and black headphones forward. Surreal twist: molten sparks and glowing embers fly out of the ear cups, forming a miniature blacksmith forge with an anvil and flames inside one ear cup, heat waves rising. Elements: embers, smoke layers, motion streaks. Text: top "Echo Forge", center "HEAR THE FIRE.", bottom strip "POWER BASS / RUGGED BUILD / ALL DAY FIT".POSTER 3 (bottom-left), brand AURA BUDS, idea "QUIET THE WORLD."Background: large rounded rectangle in soft sage green. Giant typography: "AURA" in huge cream rounded letters behind the subject. Subject: fictional man in his thirties, light stubble, cream knit sweater, calm relaxed expression, holding a small white earbuds case open toward the camera. Surreal twist: a peaceful forest lake appears inside the open case, with mist, tiny pine trees, a drifting rowboat and birds flying out, while the city noise fades into soft fog around his shoulders. Elements: floating leaves, soft fog layers, gentle light rays. Text: top "Aura Buds", center "QUIET THE WORLD.", bottom strip "SMART NOISE BLOCK / FEATHER LIGHT / 30H CASE".POSTER 4 (bottom-right), brand BASSLINE, idea "DROP THE BASS."Background: large rounded rectangle in hot pink and electric blue gradient. Giant typography: "DROP" in huge bold white letters behind the subject. Subject: fictional young woman in her mid-twenties, bright pink bob, oversized yellow jacket, laughing and dancing mid-motion, holding colorful neon headphones forward. Surreal twist: the ear cups burst open and the beat shakes the air, with speakers, vinyl records and music notes orbiting her like planets and a ring-shaped shockwave around the headphones. Elements: neon streaks, confetti, playful chaos. Text: top "Bassline", center