Echo 20 Thuderbolt 4 SuperDock Review

At a glance

Expert’s Rating


  • 19 top-end ports
  • Built-in M.2 NVMe SSD slot
  • 2.5Gb Ethernet
  • Dedicated HDMI 2.1 port
  • 100W PD


  • HDMI means just two downstream TB4 ports
  • 150W power supply

Our Verdict

It’s got more top-end ports than any other dock we’ve tested and a built-in SSD enclosure so you can add up to an extra 8TB of storage, yet it is one of the most affordable docking stations available.

Is it a bird? Is it a plane? No it’s SuperDock! But what makes Sonnet’s latest Thunderbolt 4 laptop docking station so super?

The super-ness is not the 19 top-end ports, although these are certainly impressive. It’s not the 2.5x faster Ethernet connection. And it’s not the backward-compatible Thunderbolt 4 technology that is certified to the very latest Intel standards.

What makes the Sonnet Echo 20 Thunderbolt 4 SuperDock so super is its built-in M.2 NVMe SSD slot which means you can add up to 8TB of SSD storage to your system without connecting an external storage device to the dock or computer.

But first, let’s look at the abundance of ports this dock boasts to connect devices at top speed.

Specs and features

The Sonnet Echo 20 Thunderbolt 4 SuperDock has a copious 19 ports. The “20” in the Echo 20’s name includes the power supply port, which we don’t usually count in our port countdown.

  • One upstream Thunderbolt 4 port (40Gbps, 100W)
  • Two downstream Thunderbolt 4 ports (40Gbps, 15W)
  • One HDMI 2.1 video port
  • Four USB-A ports (10Gbps, 7.5W)
  • Four USB-C ports (10Gbps, 7.5W)
  • Internal M.2 NVMe SSD slot
  • 2.5 Gigabit Ethernet
  • UHS-II SD card reader (312MBps)
  • 3.5mm combo audio jack (front)
  • 3.5mm microphone jack (back)
  • Two (right and left channels) line out RCA jacks (back)
  • 150W power supply

The Echo 20 has more ports than we’ve seen with any docking station. Even the Caldigit TS4 Dock has only (!) 18, and it’s this kind of Thunderbolt 4 docks that Sonnet is gunning for. Read our fuller roundup of our other recommendations for the best Thunderbolt docks for Mac.

Thunderbolt 4, USB-C and USB-A ports

All the Echo 20’s USB ports are at least 10Gbps (twice the bandwidth of the many docks’ USB ports). The TS4 has as many (8) but the Echo 20 has one more USB-C, while the TS4 has the extra USB-A. As more devices eschew Type A for Type C, we applaud Sonnet for having as many USB-C as USB-A.

You can daisy-chain up to six Thunderbolt devices via the two downstream Thunderbolt 4 ports, although the devices connected will be sharing the 40Gbps bandwidth upstream to the laptop.

Rather than add the maximum possible three downstream Thunderbolt 4 ports, Sonnet includes two plus a high-end HDMI 2.1 video port so the user can add a direct external display without the need for an adapter.

If you plan to connect an HDMI display, that makes more sense than a third Thunderbolt 4 port.

Adding internal storage

The Echo 20 doesn’t ship with an SSD, so you need to purchase one yourself. A 1TB SSD can be found for under $50, 2TB for around $100, 4TB for $250. 8TB SSDs can cost between $800 and $1,000.

If you were configuring a new MacBook with 8TB of internal storage, Apple would charge you $2,200, so adding it to your connected docking station at half the price makes a lot of sense, and you can swap it out with other capacities as you desire.

It must be an M.2 NVMe SSD. With the right SSD, transfer and access data rates are up to 800MBps.

SSD installation is simple if you know how to use a screwdriver and don’t have shaky hands. Unscrew the two screws securing a panel cover on the back panel of the dock. Insert the SSD and re-secure the bottom cover.

However, we would have preferred Sonnet to include the correct screwdrivers with the dock as what you need—a tiny crosshead—may not be in the average toolbox.

The Echo 20 isn’t heavy but even with its compact power supply it’s not particularly portable, so what you store on that SSD isn’t going with you when you disconnect the laptop from the dock. It’s great for backups, archiving, and for large files you don’t need with you on the road.

There’s also a fast SD card reader for more portable storage…

Portable storage

The Echo 20 features just one SD card reader for portable storage, while the TS4 has both SD and MicroSD readers.

Having both formats offers more flexibility, and the two slots can be used at the same time, so the TS4 wins if you prefer portable storage to be installed.

Most MicroSD cards come with an SD adapter so the lack of MicroSD doesn’t stop you from choosing between the two memory-card formats on the Echo 20. MicroSD cards are usually cheaper than full-size SD.

Tiny memory cards were once the preserve of professional users such as photographers who use them to quickly transfer files. However, anyone can buy a quality 512GB card for around $75/£75, and they offer an inexpensive way of upping the storage in your laptop and are super portable, too.

The Echo 20’s UHS II SD card reader is rated fast at 312MBps—the same as the TS4’s.

As with other docks, if you prefer portable storage there are other options, too. For example, you could add a pocketable SSD enclosure, such as Ugreen’s M.2 NVMe SSD Enclosure Adapter, available for around $30 (also not including the SSD itself).

Dock display options

You can connect an external display via the HDMI 2.1 port (without the need for an adapter), and another screen via one of the Thunderbolt ports, or two via both the downstream Thunderbolt ports.

Dual-display support means M1/M2 Pro, M1/M2 Max and M1/M2 Ultra Macs can hook up either a single 4K/5K/6K screen or two HD/4K/5K/6K displays.

A Mac with an M2 Pro/Max/Ultra chip can support up to a single 8K display at 60Hz, or two HD/4K/5K/6K displays (both 4K at 60Hz).

Windows PCs and Chromebooks sporting Thunderbolt 4 can support up to a single 8K display at 60Hz, or two HD/4K displays at 60Hz.

If you install DisplayLink software you can run two displays off connected plain M1 and M2 Macs, which otherwise are limited to one display. Learn more about adding multiple screens to M1 or M2 Macs in our tutorial and solution recommender.

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