Create a high-impact exhibition booth background design for a car audio brand. Style: dark, modern, high-contrast, energetic, and immersive. Concept: "sound energy and power" Requirements: - Use a dark background (black or deep blue gradient) - Include subtle texture (metal, grain, or brushed effect) - Add one or two large car speakers as a watermark (low opacity, slightly blurred, partially cropped) - Incorporate dynamic sound wave or frequency lines (not decorative, but realistic and powerful) - Use blue lighting/glow effects to simulate audio energy - Keep strong visual hierarchy with clean composition - Leave negative space for logo placement - Avoid clutter and avoid generic patterns Mood: futuristic, powerful, high-performance, automotive, audio-focused Do not include text or logos. Output should look like a professional trade show booth wall design, visible and impactful from a distance.