【Sonnet Technologies】Echo Express III-D HDX Edition Thunderbolt to 3-Slot PCIe Card Expansion System (discontinued)

  • 3 x Full-Length PCIe Card Slots
  • 2 x Thunderbolt 3 Connectors
  • Optimized for Avid Pro Tools | HDX
  • Desktop Design
  • Up to 1750 MB/s PCIe Bandwidth
  • 300W Power Supply
  • Quiet, Power-Saving Operation
  • Works with Mac, Windows & Linux

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Local Delivery

CHINAM is currently shipping within Hong Kong and specific countries only. We use local courier service as our delivery company. We do not support shipping items in a single order to multiple shipping addresses. To ship items to an additional address, please place a new order to us. Unless otherwise specified, delivery charge at the rate of HK$300 will be imposed on each delivery. We currently offer free delivery for each order over HK$1,000.

For remote areas or outlying islands delivery service, please contact our sales team via email - sales@chinam.com.hk

International Delivery

We will do our best to ship internationally to countries where we do not have sales representation. Please register with us, we’ll keep you updated and notify you when this is about to happen and become available in your region. Please note, at this time the customer is responsible for the duties and taxes imposed by their country.

For international shipping please contact our sales team via email - sales@chinam.com.hk

Deliver Time

  • Once your order has been handed over to the carrier for delivery, you will receive a shipment notification email with an estimated delivery date. Please note that it is not possible to expedite your delivery and receive your package earlier than the scheduled delivery date. Therefore, we are unable to accept requests for expedited delivery. Our carriers are unable to provide an exact time of day for your delivery. If you ordered multiple items, you may receive separate shipments.
  • All estimates are based on business days. We only make deliveries in the specified areas of Hong Kong from Monday to Sunday except on the first two days of the Lunar New Year and when typhoon warning signal No. 8 or above or black rainstorm warning is in force.
  • All rescheduling of delivery, additional purchases, new sales memos and amendments must be made 3 days before the scheduled delivery date. Otherwise, a double delivery charge will be incurred.
  • We may deliver the merchandise in one or more installments, and some of the merchandises may be delivered directly from suppliers. Any times and dates given for dispatch of merchandise, or the length of time that merchandise will take to be delivered, are only estimates. If we are unable to meet any stated dispatch or delivery dates or times we will inform you as to the progress of your order. You agree and accept that under no circumstances will we accept cancellation of order or refund.

Signature On Delivery

  • Most of our shipments contain valuable items. If you will not be in attendance to accept delivery of your purchase, consider shipping to someone you trust will be able to sign for your package. For your convenience, you may prefer to have your order delivered to your office address. If you choose this option, please include the name of your business in the address. Please note, if you choose this option, goods may be left with reception or the Mail Room.
  • As our carriers require a signature on delivery, the carrier will leave a calling card if you are not at home. Please contact the carrier to reschedule delivery.
  • For postal deliveries, no signature is required and order status tracking is not available.
  • Delivery failure due to no one answering the door upon the arrival of goods at the appointed time, or to circumstantial limitations such as the entrance being too small, will require a rescheduled delivery and therefore incur double delivery charges.
  • We will deliver the merchandise ordered by you to the address you give us for delivery at the time you make your order through our staff or a third party provider. You agree to present your photo identification upon request when you acknowledge receipt of the merchandise. The merchandise shall be, and shall be deemed to be, delivered and accepted by you when the merchandise are delivered to the address you give us for delivery. You agree and accept that we are entitled, at our option, to charge you additional costs or cancel your order in the event of your failure to accept delivery for whatever reasons.


  • You will become the owner of the merchandise you have ordered when they have been delivered to you. Once merchandise has been delivered to you they will be held at your own risk and we will not be liable for the loss or damage.
  • You may not export any products purchased at CHINAM online store. We sells and ships products to end-user customers only. Notwithstanding order confirmation, CHINAM may cancel any order where it has reasonable grounds to believe the product is not being purchased for end use.
  • If there is any inconsistency or ambiguity between the English version and the Chinese version, the English version shall prevail.
  • We reserve the final right to terminate or alter the above terms and conditions. In the event of any dispute, our decision shall be final and conclusive.
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Expand the capabilities of your Thunderbolt 3-compatible computer system by adding up to three full-length PCIe cards using the Echo Express III-D Thunderbolt 3 HDX PCIe Expansion Card Enclosure from Sonnet. This external desktop aluminum enclosure adds a PCIe 2.0 x16 slot and two PCIe 2.0 x8 slots to your compatible Mac, Windows, or Linux computer system. With support for full-width and full-height non-GPU Thunderbolt 3 compatible expansion cards, you can install up to three single-width PCIe cards or one double-width card alongside a single-width card. The Echo Express III-D is also fully optimized for Avid Pro Tools | HDX PCIe cards, which allows you to install up to three cards for use with the Pro Tools HD software without any additional hardware or configuration.

Connect the enclosure to your computer using one of the two Thunderbolt 3 connectors, which feature 15W power delivery and up to 40 Gb/s throughput. That provides up to 1750 MB/s of bandwidth to installed cards. You can also daisy chain up to five additional devices such as compatible external storage drives and monitors. Additionally, the Echo Express III-D has an integrated 300W power supply with a 75W auxiliary power connector. It is designed to operate quietly and includes a power saving mode that will automatically power down the system when it's not in use.

Full-Size Expansion
The Echo Express III-D desktop enclosure supports up to three full-length (12.28"), full-width, and full-height non-GPU Thunderbolt 3-compatible PCIe expansion cards.

HDX Optimized
The enclosure is designed to work with up to three Avid Pro Tools | HDX PCIe expansion cards with no additional hardware or configuration necessary.

Thunderbolt 3 Connectivity
Two Thunderbolt 3 ports are available, capable of 15W power delivery and transferring data at up to 40 Gb/s, providing installed cards up to 1750 MB/s of bandwidth. You can also daisy chain up to five additional devices.

Powered Up
There is 300W power supply with a 75W auxiliary connector for expansion cards that require extra power. The enclosure is designed to operate quietly and has a power saving mode that will automatically shut down or turn on the enclosure as needed.

Sonnet Echo Express III-D Specification


Expansion Slots 2 x PCIe 2.0 x8 (x4 mode)
1 x PCIe 2.0 x16 (x8 mode)
GPU None
Supported PCI Card Sizes Full-Height, Full-Length
System Connection Thunderbolt 3
Inputs/Outputs 2 x USB-C (Thunderbolt 3)
Data Transfer Rates Thunderbolt 3: 40 Gb/s
Operating System Support Linux, Windows, macOS/OS X


Power Source Type 300 W Internal PSU
AC Input Power 115 to 230 VAC, 50 / 60 Hz
DC Input Power 12 VDC


Operating Temperature 32 to 95°F / 0 to 35°C


Form Factor Desktop
Construction Material Aluminum
Host Cable Length 2.3' / 0.7 m
Dimensions 3.82 x 10.2 x 15.94" / 9.7 x 25.9 x 40.5 cm
Weight 7.5 lb / 3.4 kg
  • Sonnet Echo Express III-D Thunderbolt 3 HDX PCIe Expansion Card Enclosure (Desktop)
  • Power Cord
  • Thunderbolt 3 Cable (2.3')
  • ThunderLok 3 Thunderbolt Connector Security Clip
  • Limited 2-Year Warranty
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