gt4dSony MHC-GT4D Portable DJ System Review & Features 20171. Sony MHC-GT4D Soundspeaker size: Mid Unit Size ( 8cm x 2 cone type), Tweeter Unit Size (4 cm x 1 c...How to Play Grand Dragon 4D . Players should choose 4 - 6 numbers from 1 to 49 to play GD Lotto. For example 1661, 1696, 0936, 3477, and 5133.