• [quote]Does a 4x4 MIMO system mean it has to be using 4 spatial streams?[/quote]

    Short answer is no. 4x4 just refers to the number of transmit (Tx) and receive (Rx) radio chains, respectively. If you take a look at the Wifi Alliance certificate for that product (click the 'view' link once the page loads) you can see that it only supports 2 spatial streams.

    Overall, this AP looks rather feature-poor.

    To get a good explanation of 802.11n terminology and nomenclature I'd recommend checking out Marcus Burton's blog post about the first 3x3:3 certified access point:

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