Name: 4K60 4:4:4 4×4 HDMI Matrix with Independent Per-Output Scaling
Brand: KanexPro
SKU: MMX-4X4AUD

Question 1

What video bandwidth does the MMX-4X4AUD support?

Accepted Answer

The MMX-4X4AUD supports 18Gbps video bandwidth.

Question 2

What color depth does the MMX-4X4AUD carry at 4K60 4:4:4?

Accepted Answer

At 4K60Hz YCbCr 4:4:4 it carries 8-bit color. It supports 8-bit, 10-bit and 12-bit at 1080p, 4K30Hz and 4K60Hz (YCbCr 4:2:0).

Question 3

How can the MMX-4X4AUD be controlled?

Accepted Answer

It offers four control methods: the front panel, RS-232, the IR remote, and TCP/IP. A built-in Web GUI is available over TCP/IP.

Question 4

What RS-232 settings does the MMX-4X4AUD use?

Accepted Answer

Use 115200 baud (default), 8 data bits, no parity, and 1 stop bit. Every command must end with an exclamation mark, and all spaces shown in a command are required.

Question 5

How is the MMX-4X4AUD powered?

Accepted Answer

It uses the included 12V/2.5A locking power adapter into the DC 12V input; the adapter accepts AC 100-240V, 50/60Hz.

Question 6

In what order should I connect the MMX-4X4AUD?

Accepted Answer

Connect the HDMI sources first, then the HDMI displays, then your control device (TCP/IP, RS-232 or IR IN), then any audio devices to the coaxial or L/R outputs, and finally the 12V DC power supply.

Question 7

The MMX-4X4AUD shows no picture and appears dead. What should I check?

Accepted Answer

Look at the POWER LED: red means the unit is active and controllable, off means it is in standby. Wake it from standby with the IR remote power key, the Web GUI Power button, or the s power 1! command.

Question 8

My 1080p display shows nothing from a 4K source on the MMX-4X4AUD. What should I check?

Accepted Answer

Set that output's scaler mode to 4K->1080p or AUTO rather than Bypass, since Bypass passes the source resolution through unchanged. You can set it by holding the OUT button 3 seconds, on the Web GUI Output page, or with s hdmi y scaler 2!.

Question 9

Will my 1080p display still work if the source is 4K?

Accepted Answer

Yes. Each of the four outputs scales independently, so a 4K60 source can feed a 4K display at full resolution while a legacy 1080p display on another output receives a clean 4K→1080p downscaled feed at the same time.

Question 10

Can I send audio to a separate sound system without upgrading to an AVR?

Accepted Answer

Yes. Every output breaks audio out to both a 3.5mm analog L/R jack and an RCA coaxial port. The coax carries PCM 2.0, Dolby Digital/Plus, and DTS 2.0/5.1; the analog output carries PCM 2.0 stereo. That feeds a zone amp, soundbar, or DSP directly.