Secure KVM Systems

TEMPEST Certifiable 4x2 Mini-Matrix KVM with Filtered USB

Expert rating8.2 / 10

Port Count:: 4x2
Video Standard:: DisplayPort/HDMI
Max Resolution:: 4K@60Hz

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: Secure KVM Systems Last updated: 2026-09-12

TEMPEST Certifiable 4x2 Mini-Matrix KVM with Filtered USB Review

TEMPEST certifiable SX42PHU-4T 4x2 mini matrix filtered USB emissions security SCIF classified DisplayPort HDMI

The SX42PHU-4T is the TEMPEST-certifiable sibling of the SX42PHU-4, built with a shielded enclosure and filtered I/O so it can pass emissions-security testing for SCIF or equivalent installations where electromagnetic leakage, not just data isolation, is part of the accreditation requirement.

What 'TEMPEST Certifiable' Means Here

The unit ships built to support emissions-security accreditation testing under NSTISSAM Level I criteria; it is not pre-certified for every site, since TEMPEST certification is facility- and installation-specific, but the hardware is designed to pass that testing where a standard SX42PHU-4 would not be evaluated for RF emissions at all.

Same Matrix and Filtering Capability

Functionally it matches the SX42PHU-4 exactly, 4x2 independent 4K60 routing plus filtered USB, the added cost and design work goes entirely into emissions shielding rather than new features.

Comparison to Alternatives

If a facility does not require TEMPEST accreditation, the standard SX42PHU-4 delivers identical functionality at a comparable price without the emissions-hardening overhead. For 8-source TEMPEST-certifiable needs, see the SX82PHU-4T.

Our verdict

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

Expert rating8.2 / 10

Specify this over the standard SX42PHU-4 only when the installation requires TEMPEST emissions-security accreditation — otherwise the feature set is identical.

Best for

SCIF installations requiring TEMPEST/NSTISSAM Level I accreditation
Facilities where RF emissions control is a stated compliance requirement
4-source secure desks needing filtered USB in emissions-controlled spaces

Not for

Standard secure facilities with no TEMPEST requirement (SX42PHU-4 is equivalent and simpler to source)
8-source requirements (see the SX82PHU-4T)
Budget-driven buys where emissions hardening isn't needed

Specifications

What these specs mean

Capability Score

8.2/10

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

Design

Port Count	4
Switching Method	Front-panel and remote pushbutton, independent per output

Topology

Displays Per Computer	2 displays
KVM Segment	Secure

Video & Features

Video Standard	DisplayPort/HDMI
Max Resolution	4K@60Hz
USB Hub Ports	4
Audio Support	No

Per display capability

Max Refresh At Max Resolution	60 Hz
Max Refresh At 4K	60 Hz

Display continuity

EDID Emulation	Yes

Switching control

Hotkey Switching	No

In the box and price

Price	1380.00 USD

FAQs

What are the key specifications of the TEMPEST Certifiable 4x2 Mini-Matrix KVM with Filtered USB?

The TEMPEST Certifiable 4x2 Mini-Matrix KVM with Filtered USB is a KVM switch from Secure KVM Systems. Key specs: Port Count 4x2, Switching Method Front-panel and remote pushbutton, independent per output, Video Standard DisplayPort/HDMI, Max Resolution 4K@60Hz, USB Hub Ports 4.

Who is the TEMPEST Certifiable 4x2 Mini-Matrix KVM with Filtered USB best suited to?

Best suited to: SCIF installations requiring TEMPEST/NSTISSAM Level I accreditation; Facilities where RF emissions control is a stated compliance requirement; 4-source secure desks needing filtered USB in emissions-controlled spaces.

What are the drawbacks of the TEMPEST Certifiable 4x2 Mini-Matrix KVM with Filtered USB?

Not the best fit for: Standard secure facilities with no TEMPEST requirement (SX42PHU-4 is equivalent and simpler to source); 8-source requirements (see the SX82PHU-4T); Budget-driven buys where emissions hardening isn't needed.