Sony Unveils 3 ULT Party Speakers Priced From $449 to $1,499

Q: What hidden acoustic technology allows Sony's new party speakers to generate bone-rattling 45Hz bass without relying on separate subwoofers?

The key acoustic trick is Sony’s **“ULT DUCT”** design, working with **three large woofers, including a rear-firing woofer**, to move more air and extend bass down to **45Hz** without a separate subwoofer. In practical terms, the ULT DUCT appears to function like a tuned airflow and bass-loading system. By controlling how air is pushed through the cabinet, it helps the speaker produce deeper low frequencies more efficiently than a standard enclosure would on its own. Sony pairs that with multiple large woofers and a large cabinet, which gives the flagship **ULT TOWER MAX** enough internal volume and driver surface area to generate stronger low-end output. The rear-firing woofer also matters. It adds low-frequency energy in a different direction, helping reinforce the bass response and contribute to the speaker’s room-filling effect. That is part of why Sony can market the system as an all-in-one party speaker rather than one that depends on an external sub. Sony also supplements the hardware with its **ULT sound modes**. **ULT1** is tuned to boost bass, while **ULT2** pushes overall output higher. But the underlying reason it can hit that “bone-rattling” 45Hz region is the cabinet-and-driver engineering: the **ULT DUCT**, the **multi-woofer layout**, and the **rear-firing woofer** working together.

3 articles · Updated · Gizmodo · Sep 1

Three new ULT Power Sound models — Tower 5, Tower 7 and Tower Max — arrive this month, with the largest carrying a $1,499 price tag.
Sony is pitching the lineup on scale and output: the 121-pound Tower Max packs three 280mm woofers, while the 50-pound Tower 7 and 29-pound Tower 5 step down in size and driver count.
Tower 7 and Tower Max add 360-degree sound, and all three include bass, power, flat and live sound modes plus Bluetooth, XLR, RCA and USB-C connections.
Battery life reaches 25 hours on Tower 7 and 20 hours on Tower 5, while the plug-in-only Max gets redesigned wheels and the lineup adds built-in lighting and updated handles for easier transport.