A503X, also known as Alexandre Sales Miquel, is a Spanish musician and sound technician born in Lleida on September 10, 1980. He is a multi-instrumentalist and studied at Microfusa in Barcelona from 2003 to 2004. A503X has performed at various music festivals, local venues, and private sets, and has worked with several record labels. He has been featured in top mixes on Beatport and has created exclusive sets for radio stations such as TOA FM, UNDERGROUND CULTURE, and CUEBASE FM. In 2019, he co-founded Acid Candle in Barcelona with his friend 100, and in 2020, he launched his own record label, A503X Records.

A503X, the alias of Alexandre Sales Miquel, is a talented musician and sound technician hailing from Lleida, Spain. With a diverse musical background and proficiency in multiple instruments, he has showcased his skills at various music festivals, local venues, and private events. A503X's work has been recognized on platforms like Beatport, where his tracks have been featured in top mixes. Additionally, he has curated exclusive sets for radio stations such as TOA FM and CUEBASE FM. In collaboration with his friend 100, A503X co-founded Acid Candle in Barcelona in 2019, and in 2020, he established his own record label, A503X Records.