This paper introduces the Logitech Squeezebox Boom audio design. It is a network music player with built-in speakers, featuring advanced digital signal processing, high-quality bi-amplified speaker design, and an easy-to-use user interface.
The Logitech Squeezebox Boom is an all‑in‑one network music player that combines a high‑performance digital signal processor, class‑D amplifiers, custom drivers and a sealed enclosure to deliver full‑range sound in a compact desktop form factor. This document provides a technical overview of the audio architecture, from the I2S/I2C interface through the DSP, DACs, power amplifiers and loudspeaker drivers.
Key sections describe the TI TAS3204 DSP core, the Wolfson WM8501 secondary DAC, the class‑D TI TPA3100D2/TPA3101D2 amplifiers, the custom 3‑inch woofers and soft‑dome tweeters, the 4th‑order Linkwitz‑Riley crossovers, StereoXL stereo‑expansion technology, bass‑extension filtering, and the subwoofer/headphone output and line‑in capabilities.
| DSP core | 48‑bit‑by‑24‑bit, 135 MIPS |
|---|---|
| DSP clock speed | 135 MHz |
| Digital audio processor | TI TAS3204 |
| Secondary DAC | Wolfson WM8501 |
| Power amplifiers | TI TPA3100D2, TPA3101D2 |
| Woofer frequency response | 100 Hz – 4 kHz |
| Tweeter frequency response | 1.2 kHz – 20 kHz |
| Woofer‑tweeter crossover frequency | 2 kHz |
| Subwoofer/headphone DAC output level | 1 V RMS into 16 Ω, 1.7 V into high‑Z load |
A 4th‑order Linkwitz‑Riley crossover is used for the woofer‑tweeter crossover.