JBL, a leading audio equipment brand, faced the challenge of ad fatigue and budget inefficiency within its robust Amazon DSP campaigns, where overexposure was diluting effectiveness. Partnering with DEPT®, the brand leveraged Amazon Marketing Cloud (AMC) to analyze 90 days of campaign data and identify the optimal "frequency sweet spot" where performance peaked before declining. By building custom audiences to exclude saturated users and reallocating budget toward fresher, high-intent prospects, the strategy delivered immediate results: a 123% surge in Return on Ad Spend (ROAS), a 115% increase in sales, and a 19% rise in Detail Page View Rate (DPVR) in just one month, proving the value of data-driven frequency capping.