Sonnet’s newest Thunderbolt 5 dock, the Echo 21, arrives with a dense array of ports and an internal NVMe bay, promising a single‑device hub that keeps up with modern Mac workflows. The unit measures 9.6 inches long, 4.2 inches wide and 1.3 inches thick, and its 2.9‑pound kit includes a 140 W power brick and a 2.5‑foot Thunderbolt cable today for.

Inside, the Echo 21 splits its 21 connectors between front and rear. Users find two USB 3.2 10 Gbps Type‑A ports, three Type‑C, a headphone jack, and SD/microSD readers up front, while the back hosts two additional Thunderbolt 5 links, DisplayPort 2.0, HDMI 2.0b, 10‑GbE, and several USB‑C and USB‑A slots to support high‑bandwidth peripherals and data transfers without bottlenecks in most contexts.

The dock’s standout feature is its 3,300 MB/s NVMe bay, which the reviewer verified with PCI‑E 4 drives. Even PCI‑E 3 SSDs hit 2,600 MB/s, comfortably exceeding typical external‑drive speeds. Coupled with a silent, fanless chassis, the Echo 21 delivers near‑maximal throughput while keeping the desk uncluttered for power users who value speed and quiet operation in a compact form factor and high performance for home studios.

Priced at $499, the Echo 21 sits at the premium end of the market, but its breadth of connectivity and built‑in storage justify the cost for creative professionals who demand uninterrupted throughput. Compared to the Echo 13, which offers less bandwidth for $479, the Echo 21’s extra ports and internal drive make it the more versatile choice.