16 October 2025
Dolly Digital® headphones use a dual PLL system (Phase-Locked Loop), which means two separate PLL circuits work to improve audio performance and reliability. Here is a brief explanation:
PLL basics:
A PLL is an electronic circuit that synchronises the frequency and phase of an output signal with a reference signal. This supports stable, accurate signal transmission. In wireless headphones, PLLs maintain a consistent connection between the headphones and the audio source, such as a smartphone or transmitter.
Dual PLL system:
In this configuration, two PLLs work together to improve signal stability and reduce interference:
Primary PLL: Usually handles the main communication channel, making sure the audio signal is sent accurately from the source to the headphones.
Secondary PLL: Acts as a backup or supporting system. It is often used for frequency hopping, reducing interference or maintaining synchronisation in demanding settings, such as places with heavy Wi-Fi or Bluetooth traffic.
Advantages in wireless headphones:
Improved signal stability: The two PLLs work together to provide a more reliable connection, adjusting dynamically to avoid interference from other wireless devices.
Lower latency: Better signal synchronisation reduces audio delay, which matters when gaming or watching videos.
Better sound quality: Stable frequency control prevents dropouts and noise, resulting in clearer sound.
Greater range: By maintaining a strong connection, dual PLL systems can support a longer wireless range.
This technology is often used in high-end wireless headphones, particularly models using RF (radio frequency) or advanced Bluetooth systems, to provide uninterrupted, high-quality audio.
A dual PLL system supports stable sound, less noise and dependable performance, as you would expect from Dolly Digital® .
Discuss the options Contact us today to see how easily you can put together a professional audio setup.
