What's the best Android app for fine-tuning audio and managing multiple Bluetooth speakers?

JBL Portable is an Android application developed by Harman Consumer, Inc. specifically for managing JBL portable Bluetooth speakers. It excels in audio customization and speaker management, providing users with tools to enhance their listening experience. A key feature is the built-in equalizer, which allows for precise sound adjustments across different frequencies, enabling users to tailor audio output to their preferences, whether for music, podcasts, or outdoor gatherings. The app supports stereo pairing and multi-speaker playback, letting users connect multiple JBL speakers to create a unified sound system, which is useful for parties or larger spaces. Additionally, it displays real-time battery percentages for connected speakers, helping users monitor power levels during use, and facilitates firmware updates to ensure optimal performance. User reviews indicate that the equalizer is highly effective, with one stating, 'I was so surprised to know that the equaliser was so effective.' However, some limitations exist: the interface can feel clunky at times, and connectivity issues may arise, such as difficulty detecting second speakers. The volume control has been noted for lacking fine adjustments at lower levels, which can be problematic in quiet environments. Despite these minor imperfections, JBL Portable remains a robust solution for those seeking to maximize their JBL speaker's capabilities, balancing advanced features with practical utility.