The high-speed HDMI cables can handle essentially any sound format. Dolby Digital and DTS are phasing out, and Dolby TrueHD and DTS-HD Master Audio are becoming more popular. The Monoprice HDX-401E can use all of those sound settings and more. Nearly any sound quality and content you could have without the HDMI switch, you can have with it – with the exception of 4K.
Few HDMI switchers have equalization, but the Monoprice HDX-401E does. Equalization provides a larger range and improves signal quality lost through the switcher. This is most beneficial if you use very long HDMI cables in your home theater setup. For shorter distances, it doesn't matter much.
The Intelix HD-4X1 is a 4x1 HDMI Switcher with audio return channel. ARC (Audio Return Channel) is a feature that was first introduced with HDMI 1.4 standard, making it simple to send audio signals back from a connected device, such as a TV, upstream to an A/V receiver.