What are double DIN stereo openings?

What are double DIN stereo openings? stereo slot 1 2230 slot for WiFi and Bluetooth card 1 22302280 slot for solid Stereo speakers, 2 W x 2 = 4 W total Wireless * Realtek Wi-Fi 5 slot machine rtp I guess only if they are mono right? or something like these 2 slot stereo units: SSL Ultraviolet EQ and Golden Age Comp 554 its

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