SmartAVI

SmartAVI SM-D2H-4S-S

Expert rating8 / 10

Port Count:: 4
Video Standard:: HDMI (dual-head)
Max Resolution:: 4K@30Hz per head

Consumercarts is reader-supported. Learn more

Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.

Manufacturer: SmartAVI Last updated: September 12, 2026

SmartAVI SM-D2H-4S-S Review

The SmartAVI SM-D2H-4S-S is a 4-port dual-head HDMI KVM switch driving two 4K@30Hz monitors per source, with a 2-port USB hub and audio switching.

The SM-D2H-4S-S extends SmartAVI's HDMI switch line to dual monitors, letting each of four connected machines drive two 4K displays simultaneously through the switch, then swapping both screens together with one button press. That's a meaningful step up from single-head switches like the SM-UHN-4S for anyone running a two-monitor workstation across multiple source PCs. Versus the SmartAVI SM-UHN-4S, that's single-head only, cheaper, worth it if a single monitor is all that's needed. Versus the SmartAVI SM-D2H-4Q-S already in this catalog, that's the quad-monitor sibling for even larger multi-screen setups, at a higher price.

Two Monitors, Switched Together

A Step Up for Multi-Monitor Workstations

That's a meaningful step up from single-head switches like the SM-UHN-4S for anyone running a two-monitor workstation across multiple source PCs.

Comparison to Alternatives

Versus the SmartAVI SM-UHN-4S, that's single-head only, cheaper, worth it if a single monitor is all that's needed. Versus the SmartAVI SM-D2H-4Q-S already in this catalog, that's the quad-monitor sibling for even larger multi-screen setups, at a higher price.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating8 / 10

A clean dual-monitor HDMI KVM switch for four machines, sitting neatly between SmartAVI's single-head and quad-head lines.

Best for

Dual-monitor workstations switching between 4 source machines
Users who want both screens to swap together with one button
Buyers who don't need a third or fourth display

Not for

Single-monitor desks (the SM-UHN-4S is cheaper)
Quad-monitor setups (see the SM-D2H-4Q-S)
Buyers needing 60Hz refresh

Specifications

What these specs mean

Capability Score

4.2/10

How much this switch can do compared with other desk KVM switches, rated from its specifications.

Design

Port Count	4
Switching Method	Front-panel pushbutton + hotkey

Topology

Displays Per Computer	1 displays
KVM Segment	Desk

Video & Features

Video Standard	HDMI (dual-head)
Max Resolution	4K@30Hz per head
USB Hub Ports	2
Audio Support	Yes

Per display capability

Max Refresh At Max Resolution	30 Hz
Max Refresh At 4K	30 Hz

USB peripheral switching

USB Switching Speed	USB 2.0

Switching control

Hotkey Switching	Yes

In the box and price

Price	466.75 USD

FAQs

What are the key specifications of the SmartAVI SM-D2H-4S-S (4-Port Dual-Monitor HDMI KVM Switch)?

The SmartAVI SM-D2H-4S-S (4-Port Dual-Monitor HDMI KVM Switch) is a KVM switch from SmartAVI. Key specs: Port Count 4, Switching Method Front-panel pushbutton + hotkey, Video Standard HDMI (dual-head), Max Resolution 4K@30Hz per head, USB Hub Ports 2.

Who is the SmartAVI SM-D2H-4S-S (4-Port Dual-Monitor HDMI KVM Switch) best suited to?

Best suited to: Dual-monitor workstations switching between 4 source machines; Users who want both screens to swap together with one button; Buyers who don't need a third or fourth display.

What are the drawbacks of the SmartAVI SM-D2H-4S-S (4-Port Dual-Monitor HDMI KVM Switch)?

Not the best fit for: Single-monitor desks (the SM-UHN-4S is cheaper); Quad-monitor setups (see the SM-D2H-4Q-S); Buyers needing 60Hz refresh.