What's the best iOS app for syncing and customizing audio across multiple portable speakers?

JBL Portable is an iOS application specifically designed for users of JBL's portable Bluetooth speakers, focusing on enhancing control over audio output and speaker management. It stands out for scenarios requiring synchronized multi-speaker setups, such as parties or outdoor events, where users can link devices like the Charge 6 to create a cohesive soundscape without audio delays. The app includes a graphic equalizer with presets and manual sliders, allowing fine-tuning of bass, treble, and midrange frequencies to adapt to genres from classical to hip-hop. For real-world use, in a home office, the EQ can minimize harsh highs for focused work, while at a gathering, multi-speaker pairing amplifies coverage evenly.

Users report reliable Bluetooth connectivity and intuitive pairing processes, with one review stating, 'this thing is great EVERYWHERE!! Car home work anywhere. I’m going to get another charge 6 and hook them together with the app. The app works great hooks right up every time.' However, the app is exclusive to JBL products, limiting its utility for those with mixed-brand setups. Occasionally, the interface may feel sparse compared to universal audio apps, but it provides essential functions without clutter. For JBL owners seeking to optimize portability and sound customization, this app delivers practical tools, though it lacks advanced features like cross-brand compatibility.