Altavoz literally means "loudspeaker" or "speakerphone," combining the words alta (loud) and voz (voice).
In this song's emotional chorus, the singer asks his ex to "ponme en altavoz" (put me on speakerphone). He wants to make sure his declaration of love is heard loud and clear, not just by her, but by anyone else who might be listening. This single word captures the entire dramatic and vulnerable scene of the song.
We have all made promises we break the second alcohol gets involved, and that is the exact mess playing out in "EN ALTAVOZ". Grupo Frontera and Junior H team up for the ultimate late-night drunk dial. The narrator swore he would never dial her number again ("Juré / Y te había dicho que / Ya no te iba a llamar" [I swore / And I had told you that / I wasn't going to call you anymore]), but after a few drinks, all his self-control vanishes. Instead of sneaking a quiet text, he demands she put him on speakerphone ("ponme en altavoz") so she hears loud and clear that he still misses her kisses and cannot get used to life without her.
What makes this track so fun is how shamelessly honest it is about the desperation. The lyrics use blunt Mexican slang like "me puse pedo" (literally "I got fart," which means "I got drunk") to explain away the midnight call. He begs her not to hang up ("Por favor, mi amor, no cuelgues") and drops the best excuse in the whole track: "Sé que no son horas para estar llamando / Pero para andar dolido no hay horario" (I know it's not the right time to be calling / But for being heartbroken, there is no schedule). He even tries to flip the blame back on her, asking what she gains by staying mad and hiding what she really feels. It is messy, slightly dramatic, and completely relatable when you are hurting after a breakup.