We dedicate this article to one of the most prominent collaborators of AudioCar magazine (print version), which surely many of you met or have heard of. Do you remember the ‘Decibels and Watts’ section? Ing. Juan Castillo was in charge of solving all your doubts… Today we invite you to know a bit of his history.
Long before he trained thousands of installers, founded Mexico’s first professional car audio installation school, or became one of the most influential educators in the industry, Juan Castillo was simply a boy fascinated by sound.
When he was twelve, his uncle, a passionate audiophile, pulled into the driveway with music pouring from his car. Curious, Juan ran outside to see what could possibly be producing such incredible sound. He climbed into the passenger seat and immediately noticed the amplifier: an Alpine 3002.
Then the music started.
Juan was mesmerized. The sound was bigger, clearer, and richer than anything he had ever heard. No car in Mexico sounded like that.
From that moment on, he was hooked. Juan was determined to build his dream car audio system. He started making frequent trips to Tepito after school, which was home to a prominent electronics market in Mexico City. After class, he would walk half a mile to the Tasqueña metro station, ride across the city through line 2 all the way to the Zócalo station, and walk another half mile through the crowded streets to reach the Tepito electronics market. Tepito was a paradise for a young audio enthusiast. The market offered row after row of amplifiers, speakers, equalizers, and other electronic components. Juan spent hours studying the equipment, but he would always spend the most time admiring the Alpine Amplifier 3002, just like his uncle’s. He dreamed of the day he would have his own.
Juan saved as much money as he could, and began assembling the equipment for his dream sound system. By the time he finally assembled all the equipment he needed, he faced an ironic problem: he still did not own a car. And for nearly two years, Juan owned a sound system before he owned a vehicle.
When he finally received a pass-down 1979 Mustang from his parents at sixteen, he immediately set out to install the system himself. With no YouTube, internet, or online tutorials at the time, he taught himself through trial and error. Looking back, Juan laughs at how simple the installation was. But at the time, it represented something far more important: proof that he could create something with his own hands.
From that moment on, Juan Castillo spent all his spare time installing sound systems for friends and family in his parents’ garage. Years later, after obtaining his degree in electrical and mechanical engineering, he stopped and asked himself a question he had somehow avoided for months after graduation: What did he want to do with his life?
The answer was right in front of him, tangled in between the amplifiers, wires, and unfinished projects. Without consciously realizing it, his calling was what he had been doing every day since he installed his very first sound system. That night, Juan Castillo made the decision official: he would become a professional car audio installer. And this decision would eventually change not only his life, but an entire industry.
Juan Castillo founded SUONO Car Audio in 1992, a company dedicated to professional installation of car audio equipment. Mr. Castillo realized that most installers were learning through word of mouth or trial and error. But there were no structured programs teaching the theory or practice behind car audio installation.
Mr. Castillo decided to change that. In 1993, he founded what became Mexico’s first dedicated school for car audio installers: The SUONO Professional School of Car Audio Equipment Installation. Juan Castillo did not simply teach his students how to connect wires. They learned acoustics, electronics, loudspeaker enclosure design, crossover theory, gain structure optimization, and the scientific principles behind high-performance audio systems.
One of Mr. Castillo’s most significant contributions to his school’s curriculum grew from years of experimenting with band-pass speaker enclosures, one of the most technically demanding enclosure designs in car audio. He had multiple designs fail, but rather than abandon the pursuit, Castillo became determined to understand why they kept failing.
Through years of testing and experimentation, Juan Castillo developed a set of practical guidelines that could reliably predict whether a woofer would successfully perform in a band-pass design. After spending over two decades searching, without success, for these principles documented elsewhere, he concluded that the knowledge existed primarily in his own experience. Recognizing the value of these principles for the car audio industry, he incorporated these guidelines into his school’s installation curriculum and later documented them in his Level 2 training manual. To this day, installers continue to report successful results after applying those guidelines.
Juan’s SUONO Professional School of Car Audio Equipment Installation was, for many students, the first time they encountered structured technical education and original knowledge developed through decades of practical experimentation.
Over the years, thousands of students went through Juan’s installation school. Roughly seventy percent of Mexico’s most prominent installers received training from him at some point in their careers, making Juan Castillo one of the most influential educators in the history of Mexico’s car audio industry. Few individuals can claim to have directly educated such a large share of the professionals within an industry.
Many of these students opened their own businesses. Others became leaders in their regions. Some went on to train the next generation of installers themselves. What began in a single classroom ultimately helped shape an entire generation of car audio professionals.
But Juan’s influence extended far beyond the classroom. In 1995, SUONO evolved from an installation and training organization into something even more ambitious: a manufacturer of car audio equipment designed and developed by Juan himself.
At the time, the idea faced significant skepticism. Mexico had virtually no established reputation for producing high-end car audio products, and many distributors were hesitant to carry a Mexican brand. But Juan Castillo was determined to prove that world-class audio equipment could be designed and engineered in Mexico. Rather than selecting products from existing catalogs, Juan Castillo personally developed every product sold by SUONO, with a singular goal: creating the finest equipment he could develop.
Over time, that commitment to quality transformed SUONO into the first prominent 100% Mexican car audio brand to achieve nationwide recognition. Today, SUONO products can be found in virtually every state in Mexico. Remarkably, many of the company’s distributors were once students in his installation school, reflecting how Juan Castillo’s influence spread simultaneously through education and his audio equipment.
SUONO’s cables, in particular, are widely regarded among installers as some of the finest in the industry and are frequently found in award-winning competition vehicles. What began as a small Mexican brand that many distributors were reluctant to carry, became one of the country’s most recognized names in automotive audio. And in 2023, Juan Castillo decided to expand SUONO’s reach to the United States, headquartered in Houston, Texas.
But Mr. Castillo’s influence extended beyond the products he developed and the students he taught. Through articles published in leading magazines across Mexico, the United States, and Colombia, he shared technical knowledge and professional guidance with thousands of readers.
For his 100th article in the Audio Car magazine, Juan Castillo decided not to write about acoustics or loudspeaker design. Instead, he wrote about perseverance and the courage to take risks. Years later, a successful installer contacted him with an unexpected confession: «That article gave me the courage to open my own business.» The business still operates today. For Castillo, the conversation was a reminder that his influence extended far beyond technical instruction. He was helping shape careers, businesses, and the future of the industry itself.
The difference between the industry Juan Castillo entered and the one he leaves behind is striking. When he began, most installers relied on intuition, word of mouth, and trial and error. Today, installers throughout Mexico routinely use acoustic measurement tools, computer-assisted enclosure design, advanced tuning techniques, and the band-pass design guidelines Juan Castillo spent decades developing and teaching.
His legacy lives on through the thousands of installers he trained, the businesses he inspired, and the products and techniques that continue to shape car audio throughout Mexico, and now even the United States.
The young boy who once ran out to his driveway to discover what was producing such incredible sound eventually became the educator and innovator who transformed the car audio industry.
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